Power calibration

6 years ago · e02c249c31
--- a/code/espurna/config/general.h
+++ b/code/espurna/config/general.h
@ -528,9 +528,9 @@ PROGMEM const char* const custom_reset_string[] = {

 #define POWER_CURRENT_PRECISION         3
 #define POWER_VOLTAGE                   230
 #define POWER_READ_INTERVAL             10000
 #define POWER_READ_INTERVAL             6000
 #define POWER_REPORT_INTERVAL           60000
 #define POWER_REPORT_BUFFER             10
 #define POWER_REPORT_BUFFER             12
 #define POWER_ENERGY_FACTOR             (POWER_REPORT_INTERVAL / 1000.0 / 3600.0)
 #define POWER_CURRENT_DECIMALS          2
 #define POWER_VOLTAGE_DECIMALS          0
--- a/code/espurna/data/index.html.gz
+++ b/code/espurna/data/index.html.gz
--- a/code/espurna/emon.ino
+++ b/code/espurna/emon.ino
@ -1,217 +0,0 @@
 /*

 EMON MODULE

 Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>

 */

 /*
 #if EMON_SUPPORT

 #include <EmonLiteESP.h>
 #if EMON_PROVIDER == EMON_ADC121_PROVIDER
 #include "brzo_i2c.h"
 #endif

 // ADC121 Registers
 #define ADC121_REG_RESULT       0x00
 #define ADC121_REG_ALERT        0x01
 #define ADC121_REG_CONFIG       0x02
 #define ADC121_REG_LIMITL       0x03
 #define ADC121_REG_LIMITH       0x04
 #define ADC121_REG_HYST         0x05
 #define ADC121_REG_CONVL        0x06
 #define ADC121_REG_CONVH        0x07

 EmonLiteESP emon;
 bool _emonReady = false;
 double _emonCurrent = 0;
 unsigned int _emonPower = 0;
 unsigned int _emonVoltage = 0;

 // -----------------------------------------------------------------------------
 // Provider
 // -----------------------------------------------------------------------------

 unsigned int currentCallback() {

    #if EMON_PROVIDER == EMON_ANALOG_PROVIDER
        return analogRead(EMON_CURRENT_PIN);
    #endif

    #if EMON_PROVIDER == EMON_ADC121_PROVIDER
        uint8_t buffer[2];
        brzo_i2c_start_transaction(EMON_ADC121_ADDRESS, I2C_SCL_FREQUENCY);
        buffer[0] = ADC121_REG_RESULT;
        brzo_i2c_write(buffer, 1, false);
        brzo_i2c_read(buffer, 2, false);
        brzo_i2c_end_transaction();
        unsigned int value;
        value = (buffer[0] & 0x0F) << 8;
        value |= buffer[1];
        return value;
    #endif

 }

 // -----------------------------------------------------------------------------
 // HAL
 // -----------------------------------------------------------------------------

 void setCurrentRatio(float value) {
    emon.setCurrentRatio(value);
 }

 unsigned int getApparentPower() {
    return int(getCurrent() * getVoltage());
 }

 double getCurrent() {
    double current = emon.getCurrent(EMON_SAMPLES);
    current -= EMON_CURRENT_OFFSET;
    if (current < 0) current = 0;
    return current;
 }

 unsigned int getVoltage() {
    return getSetting("emonVoltage", EMON_MAINS_VOLTAGE).toInt();
 }

 // -----------------------------------------------------------------------------

 void powerMonitorSetup() {

    // backwards compatibility
    moveSetting("pwMainsVoltage", "emonVoltage");
    moveSetting("emonMains", "emonVoltage");
    moveSetting("pwCurrentRatio", "emonRatio");

    emon.initCurrent(
        currentCallback,
        EMON_ADC_BITS,
        EMON_REFERENCE_VOLTAGE,
        getSetting("emonRatio", EMON_CURRENT_RATIO).toFloat()
    );

    #if EMON_PROVIDER == EMON_ADC121_PROVIDER
        uint8_t buffer[2];
        buffer[0] = ADC121_REG_CONFIG;
        buffer[1] = 0x00;
        brzo_i2c_start_transaction(EMON_ADC121_ADDRESS, I2C_SCL_FREQUENCY);
        brzo_i2c_write(buffer, 2, false);
        brzo_i2c_end_transaction();
    #endif

    #if WEB_SUPPORT

        apiRegister(EMON_APOWER_TOPIC, EMON_APOWER_TOPIC, [](char * buffer, size_t len) {
            if (_emonReady) {
                snprintf_P(buffer, len, PSTR("%d"), _emonPower);
            } else {
                buffer = NULL;
            }
        });

        apiRegister(EMON_CURRENT_TOPIC, EMON_CURRENT_TOPIC, [](char * buffer, size_t len) {
            if (_emonReady) {
                dtostrf(_emonCurrent, len-1, 3, buffer);
            } else {
                buffer = NULL;
            }
        });

    #endif // WEB_SUPPORT

 }

 void powerMonitorLoop() {

    static unsigned long next_measurement = millis();
    static bool warmup = true;
    static byte measurements = 0;
    static double max = 0;
    static double min = 0;
    static double sum = 0;

    if (warmup) {
        warmup = false;
        emon.warmup();
    }

    if (millis() > next_measurement) {

        int voltage = getVoltage();

        {

            double current = getCurrent();
            if (measurements == 0) {
                max = min = current;
            } else {
                if (_emonCurrent > max) max = current;
                if (_emonCurrent < min) min = current;
            }
            sum += current;
            ++measurements;

            DEBUG_MSG_P(PSTR("[ENERGY] Current: %sA\n"), String(current, 3).c_str());
            DEBUG_MSG_P(PSTR("[ENERGY] Power: %dW\n"), int(current * voltage));

            // Update websocket clients
            #if WEB_SUPPORT
                char buffer[100];
                snprintf_P(buffer, sizeof(buffer), PSTR("{\"emonVisible\": 1, \"emonApparentPower\": %d, \"emonCurrent\": %s}"), int(current * voltage), String(current, 3).c_str());
                wsSend(buffer);
            #endif

        }

        // Send MQTT messages averaged every EMON_MEASUREMENTS
        if (measurements == EMON_MEASUREMENTS) {

            // Calculate average current (removing max and min values)
            _emonCurrent = (sum - max - min) / (measurements - 2);
            _emonPower = (int) (_emonCurrent * voltage);
            _emonReady = true;

            // Calculate energy increment (ppower times time)
            double energy_delta = (double) _emonPower * EMON_INTERVAL * EMON_MEASUREMENTS / 1000.0 / 3600.0;

            // Report values to MQTT broker
            mqttSend(getSetting("emonPowerTopic", EMON_APOWER_TOPIC).c_str(), String(_emonPower).c_str());
            mqttSend(getSetting("emonCurrTopic", EMON_CURRENT_TOPIC).c_str(), String(_emonCurrent, 3).c_str());
            mqttSend(getSetting("emonEnergyTopic", EMON_ENERGY_TOPIC).c_str(), String(energy_delta, 3).c_str());

            // Report values to Domoticz
            #if DOMOTICZ_SUPPORT
            {
                char buffer[20];
                snprintf_P(buffer, sizeof(buffer), PSTR("%d;%s"), _emonPower, String(energy_delta, 3).c_str());
                domoticzSend("dczPowIdx", 0, buffer);
                snprintf_P(buffer, sizeof(buffer), PSTR("%s"), String(energy_delta, 3).c_str());
                domoticzSend("dczEnergyIdx", 0, buffer);
                snprintf_P(buffer, sizeof(buffer), PSTR("%s"), String(_emonCurrent, 3).c_str());
                domoticzSend("dczCurrentIdx", 0, buffer);
            }
            #endif

            #if INFLUXDB_SUPPORT
            influxDBSend(getSetting("emonPowerTopic", EMON_APOWER_TOPIC).c_str(), _emonPower);
            influxDBSend(getSetting("emonCurrTopic", EMON_CURRENT_TOPIC).c_str(), String(_emonCurrent, 3).c_str());
            influxDBSend(getSetting("emonEnergyTopic", EMON_ENERGY_TOPIC).c_str(), String(energy_delta, 3).c_str());
            #endif

            // Reset counters
            sum = measurements = 0;

        }

        next_measurement += EMON_INTERVAL;

    }

 }

 #endif
 */
--- a/code/espurna/hlw8012.ino
+++ b/code/espurna/hlw8012.ino
@ -1,348 +0,0 @@
 /*

 POW MODULE
 Support for Sonoff POW HLW8012-based power monitor

 Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>

 */

 /*

 #if HLW8012_SUPPORT

 #include <HLW8012.h>
 #include <Hash.h>
 #include <ArduinoJson.h>

 HLW8012 hlw8012;
 bool _hlw8012Enabled = false;
 bool _hlwReady = false;
 int _hlwPower = 0;
 double _hlwCurrent = 0;
 int _hlwVoltage = 0;

 // -----------------------------------------------------------------------------
 // POW
 // -----------------------------------------------------------------------------

 // When using interrupts we have to call the library entry point
 // whenever an interrupt is triggered
 void ICACHE_RAM_ATTR hlw8012_cf1_interrupt() {
    hlw8012.cf1_interrupt();
 }

 void ICACHE_RAM_ATTR hlw8012_cf_interrupt() {
    hlw8012.cf_interrupt();
 }

 void hlw8012Enable(bool status) {
    _hlw8012Enabled = status;
    if (_hlw8012Enabled) {
        #if HLW8012_USE_INTERRUPTS == 1
            attachInterrupt(HLW8012_CF1_PIN, hlw8012_cf1_interrupt, CHANGE);
            attachInterrupt(HLW8012_CF_PIN, hlw8012_cf_interrupt, CHANGE);
        #endif
        DEBUG_MSG_P(PSTR("[POW] Enabled\n"));
    } else {
        #if HLW8012_USE_INTERRUPTS == 1
            detachInterrupt(HLW8012_CF1_PIN);
            detachInterrupt(HLW8012_CF_PIN);
        #endif
        DEBUG_MSG_P(PSTR("[POW] Disabled\n"));
    }
 }

 // -----------------------------------------------------------------------------

 void hlw8012SaveCalibration() {
    setSetting("powPowerMult", hlw8012.getPowerMultiplier());
    setSetting("powCurrentMult", hlw8012.getCurrentMultiplier());
    setSetting("powVoltageMult", hlw8012.getVoltageMultiplier());
    saveSettings();
 }

 void hlw8012RetrieveCalibration() {
    double value;
    value = getSetting("powPowerMult", 0).toFloat();
    if (value > 0) hlw8012.setPowerMultiplier(value);
    value = getSetting("powCurrentMult", 0).toFloat();
    if (value > 0) hlw8012.setCurrentMultiplier(value);
    value = getSetting("powVoltageMult", 0).toFloat();
    if (value > 0) hlw8012.setVoltageMultiplier(value);
 }

 void hlw8012SetExpectedActivePower(unsigned int power) {
    if (power > 0) {
        hlw8012.expectedActivePower(power);
        hlw8012SaveCalibration();
    }
 }

 void hlw8012SetExpectedCurrent(double current) {
    if (current > 0) {
        hlw8012.expectedCurrent(current);
        hlw8012SaveCalibration();
    }
 }

 void hlw8012SetExpectedVoltage(unsigned int voltage) {
    if (voltage > 0) {
        hlw8012.expectedVoltage(voltage);
        hlw8012SaveCalibration();
    }
 }

 void hlw8012Reset() {
    hlw8012.resetMultipliers();
    hlw8012SaveCalibration();
 }

 // -----------------------------------------------------------------------------
 // HAL
 // -----------------------------------------------------------------------------

 unsigned int getActivePower() {
    unsigned int power = hlw8012.getActivePower();
    if (HLW8012_MIN_POWER > power || power > HLW8012_MAX_POWER) power = 0;
    return power;
 }

 unsigned int getApparentPower() {
    unsigned int power = hlw8012.getApparentPower();
    if (HLW8012_MIN_POWER > power || power > HLW8012_MAX_POWER) power = 0;
    return power;
 }

 unsigned int getReactivePower() {
    unsigned int power = hlw8012.getReactivePower();
    if (HLW8012_MIN_POWER > power || power > HLW8012_MAX_POWER) power = 0;
    return power;
 }

 double getCurrent() {
    double current = hlw8012.getCurrent();
    if (HLW8012_MIN_CURRENT > current || current > HLW8012_MAX_CURRENT) current = 0;
    return current;
 }

 //unsigned int getVoltage() {
 //    return hlw8012.getVoltage();
 //}

 double getPowerFactor() {
    return hlw8012.getPowerFactor();
 }

 // -----------------------------------------------------------------------------

 void hlw8012Setup() {

    // Initialize HLW8012
    // void begin(unsigned char cf_pin, unsigned char cf1_pin, unsigned char sel_pin, unsigned char currentWhen = HIGH, bool use_interrupts = false, unsigned long pulse_timeout = PULSE_TIMEOUT);
    // * cf_pin, cf1_pin and sel_pin are GPIOs to the HLW8012 IC
    // * currentWhen is the value in sel_pin to select current sampling
    // * set use_interrupts to true to use interrupts to monitor pulse widths
    // * leave pulse_timeout to the default value, recommended when using interrupts
    #if HLW8012_USE_INTERRUPTS
        hlw8012.begin(HLW8012_CF_PIN, HLW8012_CF1_PIN, HLW8012_SEL_PIN, HLW8012_SEL_CURRENT, true);
    #else
        hlw8012.begin(HLW8012_CF_PIN, HLW8012_CF1_PIN, HLW8012_SEL_PIN, HLW8012_SEL_CURRENT, false, 1000000);
    #endif

    // These values are used to calculate current, voltage and power factors as per datasheet formula
    // These are the nominal values for the Sonoff POW resistors:
    // * The CURRENT_RESISTOR is the 1milliOhm copper-manganese resistor in series with the main line
    // * The VOLTAGE_RESISTOR_UPSTREAM are the 5 470kOhm resistors in the voltage divider that feeds the V2P pin in the HLW8012
    // * The VOLTAGE_RESISTOR_DOWNSTREAM is the 1kOhm resistor in the voltage divider that feeds the V2P pin in the HLW8012
    hlw8012.setResistors(HLW8012_CURRENT_R, HLW8012_VOLTAGE_R_UP, HLW8012_VOLTAGE_R_DOWN);

    // Retrieve calibration values
    hlw8012RetrieveCalibration();

    // API definitions
    #if WEB_SUPPORT

        apiRegister(HLW8012_POWER_TOPIC, HLW8012_POWER_TOPIC, [](char * buffer, size_t len) {
            if (_hlwReady) {
                snprintf_P(buffer, len, PSTR("%d"), _hlwPower);
            } else {
                buffer = NULL;
            }
        });
        apiRegister(HLW8012_CURRENT_TOPIC, HLW8012_CURRENT_TOPIC, [](char * buffer, size_t len) {
            if (_hlwReady) {
                dtostrf(_hlwCurrent, len-1, 3, buffer);
            } else {
                buffer = NULL;
            }
        });
        apiRegister(HLW8012_VOLTAGE_TOPIC, HLW8012_VOLTAGE_TOPIC, [](char * buffer, size_t len) {
            if (_hlwReady) {
                snprintf_P(buffer, len, PSTR("%d"), _hlwVoltage);
            } else {
                buffer = NULL;
            }
        });

    #endif // WEB_SUPPORT

 }

 void hlw8012Loop() {

    static unsigned long last_update = 0;
    static unsigned char report_count = HLW8012_REPORT_EVERY;

    static bool power_spike = false;
    static unsigned long power_sum = 0;
    static unsigned long power_previous = 0;

    static bool current_spike = false;
    static double current_sum = 0;
    static double current_previous = 0;

    static bool voltage_spike = false;
    static unsigned long voltage_sum = 0;
    static unsigned long voltage_previous = 0;

    static bool powWasEnabled = false;

    // POW is disabled while there is no internet connection
    // When the HLW8012 measurements are enabled back we reset the timer
    if (!_hlw8012Enabled) {
        powWasEnabled = false;
        return;
    }
    if (!powWasEnabled) {
        last_update = millis();
        powWasEnabled = true;
    }

    if (millis() - last_update > HLW8012_UPDATE_INTERVAL) {

        last_update = millis();

        unsigned int power = getActivePower();
        unsigned int voltage = getVoltage();
        double current = getCurrent();

        if (power > 0) {
            power_spike = (power_previous == 0);
        } else if (power_spike) {
            power_sum -= power_previous;
            power_spike = false;
        }
        power_previous = power;

        if (current > 0) {
            current_spike = (current_previous == 0);
        } else if (current_spike) {
            current_sum -= current_previous;
            current_spike = false;
        }
        current_previous = current;

        if (voltage > 0) {
            voltage_spike = (voltage_previous == 0);
        } else if (voltage_spike) {
            voltage_sum -= voltage_previous;
            voltage_spike = false;
        }
        voltage_previous = voltage;

        #if WEB_SUPPORT
        {
            unsigned int apparent = getApparentPower();
            double factor = getPowerFactor();
            unsigned int reactive = getReactivePower();

            DynamicJsonBuffer jsonBuffer;
            JsonObject& root = jsonBuffer.createObject();

            root["powVisible"] = 1;
            root["powActivePower"] = power;
            root["powCurrent"] = String(current, 3);
            root["powVoltage"] = voltage;
            root["powApparentPower"] = apparent;
            root["powReactivePower"] = reactive;
            root["powPowerFactor"] = String(factor, 2);

            String output;
            root.printTo(output);
            wsSend(output.c_str());
        }
        #endif

        if (--report_count == 0) {

            // Update globals
            _hlwPower = power_sum / HLW8012_REPORT_EVERY;
            _hlwCurrent = current_sum / HLW8012_REPORT_EVERY;
            _hlwVoltage = voltage_sum / HLW8012_REPORT_EVERY;
            _hlwReady = true;

            // Calculate subproducts (apparent and reactive power, power factor and delta energy)
            unsigned int apparent = _hlwCurrent * _hlwVoltage;
            unsigned int reactive = (apparent > _hlwPower) ? sqrt(apparent * apparent - _hlwPower * _hlwPower) : 0;
            double factor = (apparent > 0) ? (double) _hlwPower / apparent : 1;
            if (factor > 1) factor = 1;
            double energy_delta = (double) _hlwPower * HLW8012_REPORT_EVERY * HLW8012_UPDATE_INTERVAL / 1000.0 / 3600.0;

            // Report values to MQTT broker
            mqttSend(getSetting("powPowerTopic", HLW8012_POWER_TOPIC).c_str(), String(_hlwPower).c_str());
            mqttSend(getSetting("powCurrentTopic", HLW8012_CURRENT_TOPIC).c_str(), String(_hlwCurrent, 3).c_str());
            mqttSend(getSetting("powVoltageTopic", HLW8012_VOLTAGE_TOPIC).c_str(), String(_hlwVoltage).c_str());
            mqttSend(getSetting("powEnergyTopic", HLW8012_ENERGY_TOPIC).c_str(), String(energy_delta, 3).c_str());
            mqttSend(getSetting("powAPowerTopic", HLW8012_APOWER_TOPIC).c_str(), String(apparent).c_str());
            mqttSend(getSetting("powRPowerTopic", HLW8012_RPOWER_TOPIC).c_str(), String(reactive).c_str());
            mqttSend(getSetting("powPFactorTopic", HLW8012_PFACTOR_TOPIC).c_str(), String(factor, 2).c_str());

            // Report values to Domoticz
            #if DOMOTICZ_SUPPORT
            {
                char buffer[20];
                snprintf_P(buffer, sizeof(buffer), PSTR("%d;%s"), _hlwPower, String(energy_delta, 3).c_str());
                domoticzSend("dczPowIdx", 0, buffer);
                snprintf_P(buffer, sizeof(buffer), PSTR("%s"), String(energy_delta, 3).c_str());
                domoticzSend("dczEnergyIdx", 0, buffer);
                snprintf_P(buffer, sizeof(buffer), PSTR("%d"), _hlwVoltage);
                domoticzSend("dczVoltIdx", 0, buffer);
                snprintf_P(buffer, sizeof(buffer), PSTR("%s"), String(_hlwCurrent).c_str());
                domoticzSend("dczCurrentIdx", 0, buffer);
            }
            #endif

            #if INFLUXDB_SUPPORT
            influxDBSend(getSetting("powPowerTopic", HLW8012_POWER_TOPIC).c_str(), String(_hlwPower).c_str());
            influxDBSend(getSetting("powCurrentTopic", HLW8012_CURRENT_TOPIC).c_str(), String(_hlwCurrent, 3).c_str());
            influxDBSend(getSetting("powVoltageTopic", HLW8012_VOLTAGE_TOPIC).c_str(), String(_hlwVoltage).c_str());
            influxDBSend(getSetting("powEnergyTopic", HLW8012_ENERGY_TOPIC).c_str(), String(energy_delta, 3).c_str());
            influxDBSend(getSetting("powAPowerTopic", HLW8012_APOWER_TOPIC).c_str(), String(apparent).c_str());
            influxDBSend(getSetting("powRPowerTopic", HLW8012_RPOWER_TOPIC).c_str(), String(reactive).c_str());
            influxDBSend(getSetting("powPFactorTopic", HLW8012_PFACTOR_TOPIC).c_str(), String(factor, 2).c_str());
            #endif

            // Reset counters
            power_sum = current_sum = voltage_sum = 0;
            report_count = HLW8012_REPORT_EVERY;

        }

        // Post - Accumulators
        power_sum += power_previous;
        current_sum += current_previous;
        voltage_sum += voltage_previous;

        // Toggle between current and voltage monitoring
        #if HLW8012_USE_INTERRUPTS == 0
            hlw8012.toggleMode();
        #endif

    }

 }

 #endif

 */
--- a/code/espurna/power.ino
+++ b/code/espurna/power.ino
@ -132,11 +132,19 @@ void _powerRead() {
            root["pwrVoltage"] = roundTo(voltage, POWER_VOLTAGE_DECIMALS);
            root["pwrApparent"] = roundTo(apparent, POWER_POWER_DECIMALS);
            #if POWER_HAS_ACTIVE
                root["pwrFullVisible"] = 1;
                root["pwrActive"] = roundTo(active, POWER_POWER_DECIMALS);
                root["pwrReactive"] = roundTo(reactive, POWER_POWER_DECIMALS);
                root["pwrFactor"] = int(100 * factor);
            #endif
            #if POWER_PROVIDER & POWER_PROVIDER_EMON
                root["emonVisible"] = 1;
            #endif
            #if POWER_PROVIDER == POWER_PROVIDER_HLW8012
                root["hlwVisible"] = 1;
            #endif
            #if POWER_PROVIDER == POWER_PROVIDER_V9261F
                root["v9261fVisible"] = 1;
            #endif
            String output;
            root.printTo(output);
            wsSend(output.c_str());
@ -258,6 +266,14 @@ void powerEnabled(bool enabled) {
    _powerEnabledProvider();
 }

 void powerCalibrate(unsigned char magnitude, double value) {
    _powerCalibrateProvider(magnitude, value);
 }

 void powerResetCalibration() {
    _powerResetCalibrationProvider();
 }

 void powerConfigure() {
    _powerConfigureProvider();
 }
--- a/code/espurna/power_emon.ino
+++ b/code/espurna/power_emon.ino
@ -100,6 +100,24 @@ void _powerEnabledProvider() {
    // Nothing to do
 }

 void _powerCalibrateProvider(unsigned char magnitude, double value) {
    if (value <= 0) return;
    if (magnitude == POWER_MAGNITUDE_ACTIVE) {
        double power = _powerActivePower();
        double ratio = getSetting("powerRatioC", EMON_CURRENT_RATIO).toFloat();
        ratio = ratio * (value / power);
        _emon.setCurrentRatio(ratio);
        setSetting("powerRatioC", ratio);
        saveSettings();
    }
 }

 void _powerResetCalibrationProvider() {
    delSetting("powerRatioC");
    _powerConfigureProvider();
    saveSettings();
 }

 void _powerConfigureProvider() {
    _emon.setCurrentRatio(getSetting("powerRatioC", EMON_CURRENT_RATIO).toFloat());
    _power_voltage = getSetting("powerVoltage", POWER_VOLTAGE).toFloat();
--- a/code/espurna/power_hlw8012.ino
+++ b/code/espurna/power_hlw8012.ino
@ -47,32 +47,6 @@ void _hlwGetCalibration() {
    saveSettings();
 }

 void _hlwResetCalibration() {
    _hlw8012.resetMultipliers();
    _hlwGetCalibration();
 }

 void _hlwExpectedPower(unsigned int power) {
    if (power > 0) {
        _hlw8012.expectedActivePower(power);
        _hlwGetCalibration();
    }
 }

 void _hlwExpectedCurrent(double current) {
    if (current > 0) {
        _hlw8012.expectedCurrent(current);
        _hlwGetCalibration();
    }
 }

 void _hlwExpectedVoltage(unsigned int voltage) {
    if (voltage > 0) {
        _hlw8012.expectedVoltage(voltage);
        _hlwGetCalibration();
    }
 }

 // -----------------------------------------------------------------------------
 // POWER API
 // -----------------------------------------------------------------------------
@ -111,6 +85,19 @@ void _powerEnabledProvider() {
    }
 }

 void _powerCalibrateProvider(unsigned char magnitude, double value) {
    if (value <= 0) return;
    if (magnitude == POWER_MAGNITUDE_ACTIVE)  _hlw8012.expectedActivePower(value);
    if (magnitude == POWER_MAGNITUDE_CURRENT) _hlw8012.expectedCurrent(value);
    if (magnitude == POWER_MAGNITUDE_VOLTAGE) _hlw8012.expectedVoltage(value);
    _hlwGetCalibration();
 }

 void _powerResetCalibrationProvider() {
    _hlw8012.resetMultipliers();
    _hlwGetCalibration();
 }

 void _powerConfigureProvider() {
    _hlwSetCalibration();
    _hlwGetCalibration();
--- a/code/espurna/power_v9261f.ino
+++ b/code/espurna/power_v9261f.ino
@ -19,6 +19,12 @@ double _v9261f_active = 0;
 double _v9261f_reactive = 0;
 double _v9261f_voltage = 0;
 double _v9261f_current = 0;

 double _v9261f_ratioP = V9261F_POWER_FACTOR;
 double _v9261f_ratioC = V9261F_CURRENT_FACTOR;
 double _v9261f_ratioV = V9261F_VOLTAGE_FACTOR;
 double _v9261f_ratioR = V9261F_RPOWER_FACTOR;

 unsigned char _v9261f_data[24];

 // -----------------------------------------------------------------------------
@ -77,28 +83,28 @@ void _v9261fRead() {
                (_v9261f_data[4] << 8) +
                (_v9261f_data[5] << 16) +
                (_v9261f_data[6] << 24)
            ) / V9261F_POWER_FACTOR;
            ) / _v9261f_ratioP;

            _v9261f_reactive = (double) (
                (_v9261f_data[7]) +
                (_v9261f_data[8] <<  8) +
                (_v9261f_data[9] << 16) +
                (_v9261f_data[10] << 24)
            ) / V9261F_RPOWER_FACTOR;
            ) / _v9261f_ratioR;

            _v9261f_voltage = (double) (
                (_v9261f_data[11]) +
                (_v9261f_data[12] <<  8) +
                (_v9261f_data[13] << 16) +
                (_v9261f_data[14] << 24)
            ) / V9261F_VOLTAGE_FACTOR;
            ) / _v9261f_ratioV;

            _v9261f_current = (double) (
                (_v9261f_data[15]) +
                (_v9261f_data[16] <<  8) +
                (_v9261f_data[17] << 16) +
                (_v9261f_data[18] << 24)
            ) / V9261F_CURRENT_FACTOR;
            ) / _v9261f_ratioC;

            if (_v9261f_active < 0) _v9261f_active = 0;
            if (_v9261f_reactive < 0) _v9261f_reactive = 0;
@ -172,7 +178,44 @@ void _powerEnabledProvider() {
 }

 void _powerConfigureProvider() {
    // Nothing to do
    _v9261f_ratioP = getSetting("pwrRatioP", V9261F_POWER_FACTOR).toFloat();
    _v9261f_ratioV = getSetting("pwrRatioV", V9261F_VOLTAGE_FACTOR).toFloat();
    _v9261f_ratioC = getSetting("pwrRatioC", V9261F_CURRENT_FACTOR).toFloat();
    _v9261f_ratioR = getSetting("pwrRatioR", V9261F_RPOWER_FACTOR).toFloat();
 }

 void _powerCalibrateProvider(unsigned char magnitude, double value) {
    if (value <= 0) return;
    if (magnitude == POWER_MAGNITUDE_ACTIVE) {
        _v9261f_ratioP = _v9261f_ratioP * (_v9261f_active / value);
        setSetting("pwrRatioP", _v9261f_ratioP);
    }
    if (magnitude == POWER_MAGNITUDE_CURRENT) {
        _v9261f_ratioC = _v9261f_ratioC * (_v9261f_current / value);
        setSetting("pwrRatioC", _v9261f_ratioC);
    }
    if (magnitude == POWER_MAGNITUDE_VOLTAGE) {
        _v9261f_ratioV = _v9261f_ratioV * (_v9261f_voltage / value);
        setSetting("pwrRatioV", _v9261f_ratioV);
    }
    if (magnitude == POWER_MAGNITUDE_POWER_FACTOR) {
        if (value < 100) {
            double apparent = _v9261f_ratioP / (value / 100);
            value = sqrt(apparent * apparent - _v9261f_ratioP * _v9261f_ratioP);
            _v9261f_ratioR = _v9261f_ratioR * (_v9261f_reactive / value);
            setSetting("pwrRatioR", _v9261f_ratioR);
        }
    }
    saveSettings();
 }

 void _powerResetCalibrationProvider() {
    delSetting("pwrRatioP");
    delSetting("pwrRatioC");
    delSetting("pwrRatioV");
    delSetting("pwrRatioR");
    _powerConfigureProvider();
    saveSettings();
 }

 void _powerSetupProvider() {
--- a/code/espurna/settings.ino
+++ b/code/espurna/settings.ino
@ -292,7 +292,7 @@ void settingsDump() {

 void settingsLoop() {
    if (_settings_save) {
        DEBUG_MSG_P(PSTR("[SETTINGS] Saving\n"));
        //DEBUG_MSG_P(PSTR("[SETTINGS] Saving\n"));
        EEPROM.commit();
        _settings_save = false;
    }
--- a/code/espurna/static/index.html.gz.h
+++ b/code/espurna/static/index.html.gz.h
--- a/code/espurna/v9261f.ino
+++ b/code/espurna/v9261f.ino
@ -1,305 +0,0 @@
 /*

 V9261F MODULE
 Support for V9261D-based power monitors

 Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>

 */

 /*

 #if V9261F_SUPPORT

 #include <SoftwareSerial.h>
 #include <ArduinoJson.h>

 SoftwareSerial * _v9261f_uart;

 bool _v9261f_enabled = false;
 bool _v9261f_ready = false;
 bool _v9261f_newdata = false;
 int _v9261f_power = 0;
 int _v9261f_rpower = 0;
 int _v9261f_voltage = 0;
 double _v9261f_current = 0;

 unsigned char _v9261f_data[24];

 // -----------------------------------------------------------------------------
 // PRIVATE
 // -----------------------------------------------------------------------------

 void v9261fRead() {

    static unsigned char state = 0;
    static unsigned long last = 0;
    static bool found = false;
    static unsigned char index = 0;

    if (state == 0) {

        while (_v9261f_uart->available()) {
            _v9261f_uart->flush();
            found = true;
            last = millis();
        }

        if (found && (millis() - last > V9261F_SYNC_INTERVAL)) {
            _v9261f_uart->flush();
            index = 0;
            state = 1;
        }

    } else if (state == 1) {

        while (_v9261f_uart->available()) {
            _v9261f_uart->read();
            if (index++ >= 7) {
                _v9261f_uart->flush();
                index = 0;
                state = 2;
            }
        }

    } else if (state == 2) {

        while (_v9261f_uart->available()) {
            _v9261f_data[index] = _v9261f_uart->read();
            if (index++ >= 19) {
                _v9261f_uart->flush();
                last = millis();
                state = 3;
            }
        }

    } else if (state == 3) {

        if (checksumOK()) {

            _v9261f_power = (double) (
                (_v9261f_data[3]) +
                (_v9261f_data[4] << 8) +
                (_v9261f_data[5] << 16) +
                (_v9261f_data[6] << 24)
            ) / V9261F_POWER_FACTOR;

            _v9261f_rpower = (double) (
                (_v9261f_data[7]) +
                (_v9261f_data[8] <<  8) +
                (_v9261f_data[9] << 16) +
                (_v9261f_data[10] << 24)
            ) / V9261F_RPOWER_FACTOR;

            _v9261f_voltage = (double) (
                (_v9261f_data[11]) +
                (_v9261f_data[12] <<  8) +
                (_v9261f_data[13] << 16) +
                (_v9261f_data[14] << 24)
            ) / V9261F_VOLTAGE_FACTOR;

            _v9261f_current = (double) (
                (_v9261f_data[15]) +
                (_v9261f_data[16] <<  8) +
                (_v9261f_data[17] << 16) +
                (_v9261f_data[18] << 24)
            ) / V9261F_CURRENT_FACTOR;

            _v9261f_newdata = true;

        }

        last = millis();
        index = 0;
        state = 4;

    } else if (state == 4) {

        while (_v9261f_uart->available()) {
            _v9261f_uart->flush();
            last = millis();
        }

        if (millis() - last > V9261F_SYNC_INTERVAL) {
            state = 1;
        }

    }

 }

 boolean checksumOK() {
    unsigned char checksum = 0;
    for (unsigned char i = 0; i < 19; i++) {
        checksum = checksum + _v9261f_data[i];
    }
    checksum = ~checksum + 0x33;
    return checksum == _v9261f_data[19];
 }

 // -----------------------------------------------------------------------------
 // HAL
 // -----------------------------------------------------------------------------

 unsigned int getActivePower() {
    return _v9261f_power;
 }

 unsigned int getReactivePower() {
    return _v9261f_rpower;
 }

 unsigned int getApparentPower() {
    return sqrt(_v9261f_rpower * _v9261f_rpower + _v9261f_power * _v9261f_power);
 }

 unsigned int getVoltage() {
    return _v9261f_voltage;
 }

 double getCurrent() {
    return _v9261f_current;
 }

 double getPowerFactor() {
    unsigned int apparent = getApparentPower();
    if (apparent > 0) return getActivePower() / getApparentPower();
    return 1;
 }

 // -----------------------------------------------------------------------------

 void v9261fSetup() {

    _v9261f_uart = new SoftwareSerial(V9261F_PIN, SW_SERIAL_UNUSED_PIN, V9261F_PIN_INVERSE, 256);
    _v9261f_uart->begin(V9261F_BAUDRATE);

    // API definitions
    #if WEB_SUPPORT

        apiRegister(HLW8012_POWER_TOPIC, HLW8012_POWER_TOPIC, [](char * buffer, size_t len) {
            snprintf_P(buffer, len, PSTR("%d"), _v9261f_power);
        });
        apiRegister(HLW8012_CURRENT_TOPIC, HLW8012_CURRENT_TOPIC, [](char * buffer, size_t len) {
            dtostrf(_v9261f_current, len-1, 3, buffer);
        });
        apiRegister(HLW8012_VOLTAGE_TOPIC, HLW8012_VOLTAGE_TOPIC, [](char * buffer, size_t len) {
            snprintf_P(buffer, len, PSTR("%d"), _v9261f_voltage);
        });

    #endif // WEB_SUPPORT

 }


 void v9261fLoop() {

    static int sum_power = 0;
    static int sum_rpower = 0;
    static int sum_voltage = 0;
    static double sum_current = 0;
    static int count = 0;

    // Sniff data in the UART interface
    v9261fRead();

    // Do we have new data?
    if (_v9261f_newdata) {

        _v9261f_newdata = false;

        sum_power += getActivePower();
        sum_rpower += getReactivePower();
        sum_voltage += getVoltage();
        sum_current += getCurrent();
        count++;

        #if WEB_SUPPORT
        {
            DynamicJsonBuffer jsonBuffer;
            JsonObject& root = jsonBuffer.createObject();

            char buf_current[10];
            dtostrf(getCurrent(), 6, 3, buf_current);

            root["powVisible"] = 1;
            root["powActivePower"] = getActivePower();
            root["powCurrent"] = String(ltrim(buf_current));
            root["powVoltage"] = getVoltage();
            root["powApparentPower"] = getApparentPower();
            root["powReactivePower"] = getReactivePower();
            root["powPowerFactor"] = 100 * getPowerFactor();

            String output;
            root.printTo(output);
            wsSend(output.c_str());
        }
        #endif

    }

    // Do we have to report?
    static unsigned long last = 0;
    if ((count == 0) || (millis() - last < V9261F_REPORT_INTERVAL)) return;
    last = millis();

    {

        unsigned int power = sum_power / count;
        unsigned int reactive = sum_rpower / count;
        unsigned int voltage = sum_voltage / count;
        double current = sum_current / count;
        char buf_current[10];
        dtostrf(current, 6, 3, buf_current);
        unsigned int apparent = sqrt(power * power + reactive * reactive);
        double energy_delta = (double) power * V9261F_REPORT_INTERVAL / 1000.0 / 3600.0;
        char buf_energy[10];
        dtostrf(energy_delta, 6, 3, buf_energy);
        unsigned int factor = 100 * ((double) power / apparent);

        // Report values to MQTT broker
        mqttSend(HLW8012_POWER_TOPIC, String(power).c_str());
        mqttSend(HLW8012_CURRENT_TOPIC, buf_current);
        mqttSend(HLW8012_VOLTAGE_TOPIC, String(voltage).c_str());
        mqttSend(HLW8012_ENERGY_TOPIC, buf_energy);
        mqttSend(HLW8012_APOWER_TOPIC, String(apparent).c_str());
        mqttSend(HLW8012_RPOWER_TOPIC, String(reactive).c_str());
        mqttSend(HLW8012_PFACTOR_TOPIC, String(factor).c_str());

        // Report values to Domoticz
        #if DOMOTICZ_SUPPORT
        {
            char buffer[20];
            snprintf_P(buffer, sizeof(buffer), PSTR("%d;%s"), power, buf_energy);
            domoticzSend("dczPowIdx", 0, buffer);
            snprintf_P(buffer, sizeof(buffer), PSTR("%s"), buf_energy);
            domoticzSend("dczEnergyIdx", 0, buffer);
            snprintf_P(buffer, sizeof(buffer), PSTR("%d"), voltage);
            domoticzSend("dczVoltIdx", 0, buffer);
            snprintf_P(buffer, sizeof(buffer), PSTR("%s"), buf_current);
            domoticzSend("dczCurrentIdx", 0, buffer);
        }
        #endif

        #if INFLUXDB_SUPPORT
        {
            influxDBSend(HLW8012_POWER_TOPIC, String(power).c_str());
            influxDBSend(HLW8012_CURRENT_TOPIC, buf_current);
            influxDBSend(HLW8012_VOLTAGE_TOPIC, String(voltage).c_str());
            influxDBSend(HLW8012_ENERGY_TOPIC, buf_energy);
            influxDBSend(HLW8012_APOWER_TOPIC, String(apparent).c_str());
            influxDBSend(HLW8012_RPOWER_TOPIC, String(reactive).c_str());
            influxDBSend(HLW8012_PFACTOR_TOPIC,  String(factor).c_str());
        }
        #endif

        // Reset counters
        sum_power = sum_rpower = sum_voltage = sum_current = count = 0;

    }

 }

 #endif

 */
--- a/code/espurna/web.ino
+++ b/code/espurna/web.ino
@ -229,32 +229,40 @@ void _wsParse(uint32_t client_id, uint8_t * payload, size_t length) {
            // Skip firmware filename
            if (key.equals("filename")) continue;

            #if POWER_PROVIDER == POWER_PROVIDER_HLW8012
            #if POWER_PROVIDER != POWER_PROVIDER_NONE

                if (key == "pwrExpectedP") {
                    powerCalibrate(POWER_MAGNITUDE_ACTIVE, value.toFloat());
                    changed = true;
                    continue;
                }

                if (key == "hlwExpectedPower") {
                    _hlwExpectedPower(value.toInt());
                if (key == "pwrExpectedV") {
                    powerCalibrate(POWER_MAGNITUDE_VOLTAGE, value.toFloat());
                    changed = true;
                    continue;
                }

                if (key == "hlwExpectedVoltage") {
                    _hlwExpectedVoltage(value.toInt());
                if (key == "pwrExpectedC") {
                    powerCalibrate(POWER_MAGNITUDE_CURRENT, value.toFloat());
                    changed = true;
                    continue;
                }

                if (key == "hlwExpectedCurrent") {
                    _hlwExpectedCurrent(value.toFloat());
                if (key == "pwrExpectedF") {
                    powerCalibrate(POWER_MAGNITUDE_POWER_FACTOR, value.toFloat());
                    changed = true;
                    continue;
                }

                if (key == "hlwExpectedReset") {
                if (key == "pwrResetCalibration") {
                    if (value.toInt() == 1) {
                        _hlwResetCalibration();
                        powerResetCalibration();
                        changed = true;
                    }
                    continue;
                }

                if (key.startsWith("hlw")) continue;

            #endif

            #if DOMOTICZ_SUPPORT
@ -596,18 +604,19 @@ void _wsStart(uint32_t client_id) {
            root["pwrVoltage"] = getVoltage();
            root["pwrApparent"] = getApparentPower();
            #if POWER_HAS_ACTIVE
                root["pwrFullVisible"] = 1;
                root["pwrActive"] = getActivePower();
                root["pwrReactive"] = getReactivePower();
                root["pwrFactor"] = int(100 * getPowerFactor());
            #endif
            #if POWER_PROVIDER & POWER_PROVIDER_EMON
                root["emonVisible"] = 1;
                root["pwrRatioC"] = getSetting("pwrRatioC", EMON_CURRENT_RATIO);
            #endif
            #if POWER_PROVIDER == POWER_PROVIDER_HLW8012
                root["hlwVisible"] = 1;
            #endif
            #if POWER_PROVIDER == POWER_PROVIDER_V9261F
                root["v9261fVisible"] = 1;
            #endif
        #endif

        #if NOFUSS_SUPPORT
--- a/code/html/custom.js
+++ b/code/html/custom.js
@ -66,8 +66,8 @@ function doUpdate() {

        websock.send(JSON.stringify({'config': data}));

        $(".hlwExpected").val(0);
        $("input[name='hlwExpectedReset']")
        $(".pwrExpected").val(0);
        $("input[name='pwrResetCalibration']")
            .prop("checked", false)
            .iphoneStyle("refresh");

--- a/code/html/index.html
+++ b/code/html/index.html
@ -111,8 +111,8 @@
                            <a href="#" class="pure-menu-link" data="panel-idb">INFLUXDB</a>
                        </li>

                        <li class="pure-menu-item module module-hlw">
                            <a href="#" class="pure-menu-link" data="panel-hlw">HLW8012</a>
                        <li class="pure-menu-item module module-hlw module-emon module-v9261f">
                            <a href="#" class="pure-menu-link" data="panel-power">POWER</a>
                        </li>

                        <li class="pure-menu-item module module-rfb">
@ -190,32 +190,32 @@
                                    <input class="pure-u-1 pure-u-sm-3-4" type="text" name="dhtHum" readonly />
                                </div>

                                <div class="pure-g module module-pwr">
                                <div class="pure-g module module-emon module-hlw module-v9261f">
                                    <label class="pure-u-1 pure-u-sm-1-4" for="pwrCurrent">Current</label>
                                    <input class="pure-u-1 pure-u-sm-3-4" type="text" name="pwrCurrent" post=" A" readonly />
                                </div>

                                <div class="pure-g module module-pwr">
                                <div class="pure-g module module-emon module-hlw module-v9261f">
                                    <label class="pure-u-1 pure-u-sm-1-4" for="pwrVoltage">Voltage</label>
                                    <input class="pure-u-1 pure-u-sm-3-4" type="text" name="pwrVoltage" post=" V" readonly />
                                </div>

                                <div class="pure-g module module-pwrFull">
                                <div class="pure-g module module-hlw module-v9261f">
                                    <label class="pure-u-1 pure-u-sm-1-4" for="pwrActive">Active Power</label>
                                    <input class="pure-u-1 pure-u-sm-3-4" type="text" name="pwrActive" post=" W" readonly />
                                </div>

                                <div class="pure-g module module-pwr">
                                <div class="pure-g module module-emon module-hlw module-v9261f">
                                    <label class="pure-u-1 pure-u-sm-1-4" for="pwrApparent">Apparent Power</label>
                                    <input class="pure-u-1 pure-u-sm-3-4" type="text" name="pwrApparent" post=" VA" readonly />
                                </div>

                                <div class="pure-g module module-pwrFull">
                                <div class="pure-g module module-hlw module-v9261f">
                                    <label class="pure-u-1 pure-u-sm-1-4" for="pwrReactive">Reactive Power</label>
                                    <input class="pure-u-1 pure-u-sm-3-4" type="text" name="pwrReactive" post=" VAR" readonly />
                                </div>

                                <div class="pure-g module module-pwrFull">
                                <div class="pure-g module module-hlw module-v9261f">
                                    <label class="pure-u-1 pure-u-sm-1-4" for="pwrFactor">Power Factor</label>
                                    <input class="pure-u-1 pure-u-sm-3-4" type="text" name="pwrFactor" post="%" readonly />
                                </div>
@ -771,10 +771,10 @@

                    </div>

                    <div class="panel" id="panel-hlw">
                    <div class="panel" id="panel-power">

                        <div class="header">
                            <h1>HLW8012 CALIBRATION</h1>
                            <h1>POWER CALIBRATION</h1>
                            <h2>
                                Calibrate your power monitor device. Use a pure resistive load and introduce the expected values for active power, current and voltage. Use the nominal values or a multimeter to get the proper numbers. Set any field to 0 to leave the calibration value untouched.
                            </h2>
@ -784,32 +784,39 @@

                            <fieldset>

                                <div class="pure-g">
                                    <label class="pure-u-1 pure-u-md-1-4" for="hlwExpectedPower">AC RMS Active Power</label>
                                    <input class="pure-u-1 pure-u-md-3-4 hlwExpected" name="hlwExpectedPower" type="text" size="8" tabindex="51" placeholder="0" />
                                <div class="pure-g module module-hlw module-emon module-v9261f">
                                    <label class="pure-u-1 pure-u-md-1-4" for="pwrExpectedP">AC RMS Active Power</label>
                                    <input class="pure-u-1 pure-u-md-3-4 pwrExpected" name="pwrExpectedP" type="text" size="8" tabindex="51" placeholder="0" />
                                    <div class="pure-u-0 pure-u-md-1-4">&nbsp;</div>
                                    <div class="pure-u-1 pure-u-md-3-4 hint">In Watts (W). If you are using a pure resistive load like a bulb this will be writen on it, otherwise use a socket multimeter to get this value.</div>
                                </div>

                                <div class="pure-g">
                                    <label class="pure-u-1 pure-u-md-1-4" for="hlwExpectedVoltage">AC RMS Voltage</label>
                                    <input class="pure-u-1 pure-u-md-3-4 hlwExpected" name="hlwExpectedVoltage" type="text" size="8" tabindex="52" placeholder="0" />
                                <div class="pure-g module module-v9261f">
                                    <label class="pure-u-1 pure-u-md-1-4" for="pwrExpectedF">AC Power Factor</label>
                                    <input class="pure-u-1 pure-u-md-3-4 pwrExpected" name="pwrExpectedF" type="text" size="8" tabindex="51" placeholder="0" />
                                    <div class="pure-u-0 pure-u-md-1-4">&nbsp;</div>
                                    <div class="pure-u-1 pure-u-md-3-4 hint">In percentage (%). You will need to use a calibrated multimeter to get this value and a mixed resistive and reactive load.</div>
                                </div>

                                <div class="pure-g module module-hlw module-v9261f">
                                    <label class="pure-u-1 pure-u-md-1-4" for="pwrExpectedV">AC RMS Voltage</label>
                                    <input class="pure-u-1 pure-u-md-3-4 pwrExpected" name="pwrExpectedV" type="text" size="8" tabindex="52" placeholder="0" />
                                    <div class="pure-u-0 pure-u-md-1-4">&nbsp;</div>
                                    <div class="pure-u-1 pure-u-md-3-4 hint">In Volts (V). Enter your the nominal AC voltage for your household or facility, or use multimeter to get this value.</div>
                                </div>

                                <div class="pure-g">
                                    <label class="pure-u-1 pure-u-md-1-4" for="hlwExpectedCurrent">AC RMS Current</label>
                                    <input class="pure-u-1 pure-u-md-3-4 hlwExpected" name="hlwExpectedCurrent" type="text" size="8" tabindex="55" placeholder="0" />
                                <div class="pure-g module module-hlw module-v9261f">
                                    <label class="pure-u-1 pure-u-md-1-4" for="pwrExpectedC">AC RMS Current</label>
                                    <input class="pure-u-1 pure-u-md-3-4 pwrExpected" name="pwrExpectedC" type="text" size="8" tabindex="55" placeholder="0" />
                                    <div class="pure-u-0 pure-u-md-1-4">&nbsp;</div>
                                    <div class="pure-u-1 pure-u-md-3-4 hint">In Ampers (A). If you are using a pure resistive load like a bulb this will the ratio between the two previous values, i.e. power / voltage. You can also use a current clamp around one fo the power wires to get this value.</div>
                                </div>

                                <div class="pure-g">
                                    <div class="pure-u-1 pure-u-sm-1-4"><label for="hlwExpectedReset">Reset calibration</label></div>
                                    <div class="pure-u-1 pure-u-sm-1-4"><input type="checkbox" name="hlwExpectedReset" /></div>
                                <div class="pure-g module module-hlw module-emon module-v9261f">
                                    <div class="pure-u-1 pure-u-sm-1-4"><label for="pwrResetCalibration">Reset calibration</label></div>
                                    <div class="pure-u-1 pure-u-sm-1-4"><input type="checkbox" name="pwrResetCalibration" /></div>
                                    <div class="pure-u-0 pure-u-md-1-4">&nbsp;</div>
                                    <div class="pure-u-1 pure-u-md-3-4 hint">Move this switch to ON and press "Update" to revert to factory values.</div>
                                    <div class="pure-u-1 pure-u-md-3-4 hint">Move this switch to ON and press "Update" to revert to factory calibration values.</div>
                                </div>

                            </fieldset>