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Fork of the espurna firmware for `mhsw` switches
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mhsw-espurna/code/espurna/pow.ino

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/*
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 ENABLE_POW
#include <HLW8012.h>
#include <Hash.h>
#include <ArduinoJson.h>
#include <EEPROM.h>
HLW8012 hlw8012;
bool _powEnabled = false;
// -----------------------------------------------------------------------------
// POW
// -----------------------------------------------------------------------------
// When using interrupts we have to call the library entry point
// whenever an interrupt is triggered
void hlw8012_cf1_interrupt() {
hlw8012.cf1_interrupt();
}
void hlw8012_cf_interrupt() {
hlw8012.cf_interrupt();
}
void powEnable(bool status) {
_powEnabled = status;
if (_powEnabled) {
#if POW_USE_INTERRUPTS == 1
attachInterrupt(POW_CF1_PIN, hlw8012_cf1_interrupt, CHANGE);
attachInterrupt(POW_CF_PIN, hlw8012_cf_interrupt, CHANGE);
#endif
DEBUG_MSG_P(PSTR("[POW] Enabled\n"));
} else {
#if POW_USE_INTERRUPTS == 1
detachInterrupt(POW_CF1_PIN);
detachInterrupt(POW_CF_PIN);
#endif
DEBUG_MSG_P(PSTR("[POW] Disabled\n"));
}
}
// -----------------------------------------------------------------------------
void powSaveCalibration() {
setSetting("powPowerMult", hlw8012.getPowerMultiplier());
setSetting("powCurrentMult", hlw8012.getCurrentMultiplier());
setSetting("powVoltageMult", hlw8012.getVoltageMultiplier());
}
void powRetrieveCalibration() {
double value;
value = getSetting("powPowerMult", 0).toFloat();
if (value > 0) hlw8012.setPowerMultiplier((int) value);
value = getSetting("powCurrentMult", 0).toFloat();
if (value > 0) hlw8012.setCurrentMultiplier((int) value);
value = getSetting("powVoltageMult", 0).toFloat();
if (value > 0) hlw8012.setVoltageMultiplier((int) value);
}
void powSetExpectedActivePower(unsigned int power) {
if (power > 0) {
hlw8012.expectedActivePower(power);
powSaveCalibration();
}
}
void powSetExpectedCurrent(double current) {
if (current > 0) {
hlw8012.expectedCurrent(current);
powSaveCalibration();
}
}
void powSetExpectedVoltage(unsigned int voltage) {
if (voltage > 0) {
hlw8012.expectedVoltage(voltage);
powSaveCalibration();
}
}
void powReset() {
hlw8012.resetMultipliers();
powSaveCalibration();
}
// -----------------------------------------------------------------------------
unsigned int getActivePower() {
return hlw8012.getActivePower();
}
unsigned int getApparentPower() {
return hlw8012.getApparentPower();
}
unsigned int getReactivePower() {
return hlw8012.getReactivePower();
}
double getCurrent() {
return hlw8012.getCurrent();
}
unsigned int getVoltage() {
return hlw8012.getVoltage();
}
unsigned int getPowerFactor() {
return (int) (100 * hlw8012.getPowerFactor());
}
// -----------------------------------------------------------------------------
void powSetup() {
// 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 POW_USE_INTERRUPTS
hlw8012.begin(POW_CF_PIN, POW_CF1_PIN, POW_SEL_PIN, POW_SEL_CURRENT, true);
#else
hlw8012.begin(POW_CF_PIN, POW_CF1_PIN, POW_SEL_PIN, POW_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(POW_CURRENT_R, POW_VOLTAGE_R_UP, POW_VOLTAGE_R_DOWN);
// Retrieve calibration values
powRetrieveCalibration();
// API definitions
apiRegister(POW_POWER_TOPIC, POW_POWER_TOPIC, [](char * buffer, size_t len) {
snprintf(buffer, len, "%d", getActivePower());
});
apiRegister(POW_CURRENT_TOPIC, POW_CURRENT_TOPIC, [](char * buffer, size_t len) {
dtostrf(getCurrent(), len-1, 2, buffer);
});
apiRegister(POW_VOLTAGE_TOPIC, POW_VOLTAGE_TOPIC, [](char * buffer, size_t len) {
snprintf(buffer, len, "%d", getVoltage());
});
}
void powLoop() {
static unsigned long last_update = 0;
static unsigned char report_count = POW_REPORT_EVERY;
static unsigned long power_sum = 0;
static double current_sum = 0;
static unsigned long voltage_sum = 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 (!_powEnabled) {
powWasEnabled = false;
return;
}
if (!powWasEnabled) {
last_update = millis();
powWasEnabled = true;
}
if (millis() - last_update > POW_UPDATE_INTERVAL) {
last_update = millis();
unsigned int power = getActivePower();
unsigned int voltage = getVoltage();
double current = getCurrent();
unsigned int apparent = getApparentPower();
unsigned int factor = getPowerFactor();
unsigned int reactive = getReactivePower();
power_sum += power;
current_sum += current;
voltage_sum += voltage;
DynamicJsonBuffer jsonBuffer;
JsonObject& root = jsonBuffer.createObject();
root["powVisible"] = 1;
root["powActivePower"] = power;
root["powCurrent"] = current;
root["powVoltage"] = voltage;
root["powApparentPower"] = apparent;
root["powReactivePower"] = reactive;
root["powPowerFactor"] = factor;
String output;
root.printTo(output);
wsSend(output.c_str());
if (--report_count == 0) {
power = power_sum / POW_REPORT_EVERY;
current = current_sum / POW_REPORT_EVERY;
voltage = voltage_sum / POW_REPORT_EVERY;
apparent = current * voltage;
reactive = (apparent > power) ? sqrt(apparent * apparent - power * power) : 0;
factor = (apparent > 0) ? 100 * power / apparent : 100;
if (factor > 100) factor = 100;
// Calculate energy increment (ppower times time) and create C-string
double energy_inc = (double) power * POW_REPORT_EVERY * POW_UPDATE_INTERVAL / 1000.0 / 3600.0;
char energy_buf[11];
dtostrf(energy_inc, 11, 3, energy_buf);
char *e = energy_buf;
while ((unsigned char) *e == ' ') ++e;
// Report values to MQTT broker
mqttSend(getSetting("powPowerTopic", POW_POWER_TOPIC).c_str(), String(power).c_str());
mqttSend(getSetting("powEnergyTopic", POW_ENERGY_TOPIC).c_str(), e);
mqttSend(getSetting("powCurrentTopic", POW_CURRENT_TOPIC).c_str(), String(current).c_str());
mqttSend(getSetting("powVoltageTopic", POW_VOLTAGE_TOPIC).c_str(), String(voltage).c_str());
mqttSend(getSetting("powAPowerTopic", POW_APOWER_TOPIC).c_str(), String(apparent).c_str());
mqttSend(getSetting("powRPowerTopic", POW_RPOWER_TOPIC).c_str(), String(reactive).c_str());
mqttSend(getSetting("powPFactorTopic", POW_PFACTOR_TOPIC).c_str(), String(factor).c_str());
// Report values to Domoticz
#if ENABLE_DOMOTICZ
{
char buffer[20];
snprintf(buffer, 20, "%d;%s", power, e);
domoticzSend("dczPowIdx", 0, buffer);
snprintf(buffer, 20, "%s", e);
domoticzSend("dczEnergyIdx", 0, buffer);
snprintf(buffer, 20, "%d", voltage);
domoticzSend("dczVoltIdx", 0, buffer);
snprintf(buffer, 20, "%s", String(current).c_str());
domoticzSend("dczCurrentIdx", 0, buffer);
}
#endif
// Reset counters
power_sum = current_sum = voltage_sum = 0;
report_count = POW_REPORT_EVERY;
}
// Toggle between current and voltage monitoring
#if POW_USE_INTERRUPTS == 0
hlw8012.toggleMode();
#endif
}
}
#endif