Fork of the espurna firmware for `mhsw` switches
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/*
EMON MODULE
Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>
*/
#if ENABLE_EMON
#include <EmonLiteESP.h>
#include "brzo_i2c.h"
#include <EEPROM.h>
// 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;
double _current = 0;
unsigned int _power = 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
}
// -----------------------------------------------------------------------------
// EMON
// -----------------------------------------------------------------------------
void setCurrentRatio(float value) {
emon.setCurrentRatio(value);
}
unsigned int getPower() {
return _power;
}
double getCurrent() {
return _current;
}
void powerMonitorSetup() {
// backwards compatibility
String tmp;
tmp = getSetting("pwMainsVoltage", EMON_MAINS_VOLTAGE);
setSetting("emonMains", tmp);
delSetting("pwMainsVoltage");
tmp = getSetting("pwCurrentRatio", EMON_CURRENT_RATIO);
setSetting("emonRatio", tmp);
delSetting("pwCurrentRatio");
emon.initCurrent(
currentCallback,
EMON_ADC_BITS,
EMON_REFERENCE_VOLTAGE,
getSetting("emonRatio", EMON_CURRENT_RATIO).toFloat()
);
emon.setPrecision(EMON_CURRENT_PRECISION);
#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
apiRegister("/api/power", "power", [](char * buffer, size_t len) {
snprintf(buffer, len, "%d", _power);
});
}
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 (!mqttConnected()) return;
if (warmup) {
warmup = false;
emon.warmup();
}
if (millis() > next_measurement) {
// Safety check: do not read current if relay is OFF
// You could be monitoring another line with the current clamp...
//if (!relayStatus(0)) {
// _current = 0;
//} else {
_current = emon.getCurrent(EMON_SAMPLES);
_current -= EMON_CURRENT_OFFSET;
if (_current < 0) _current = 0;
//}
if (measurements == 0) {
max = min = _current;
} else {
if (_current > max) max = _current;
if (_current < min) min = _current;
}
sum += _current;
++measurements;
float mainsVoltage = getSetting("emonMains", EMON_MAINS_VOLTAGE).toFloat();
char current[6];
dtostrf(_current, 5, 2, current);
DEBUG_MSG("[ENERGY] Current: %sA\n", current);
DEBUG_MSG("[ENERGY] Power: %dW\n", int(_current * mainsVoltage));
// Update websocket clients
char text[64];
sprintf_P(text, PSTR("{\"emonVisible\": 1, \"powApparentPower\": %d}"), int(_current * mainsVoltage));
wsSend(text);
// Send MQTT messages averaged every EMON_MEASUREMENTS
if (measurements == EMON_MEASUREMENTS) {
// Calculate average current (removing max and min values) and create C-string
double average = (sum - max - min) / (measurements - 2);
dtostrf(average, 5, 2, current);
char *c = current;
while ((unsigned char) *c == ' ') ++c;
// Calculate average apparent power from current and create C-string
_power = (int) (current_avgd * mainsVoltage);
char power[6];
snprintf(power, 6, "%d", _power);
// Calculate energy increment (ppower times time) and create C-string
double energy_inc = (double) _power * EMON_INTERVAL * EMON_MEASUREMENTS / 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("emonPowerTopic", EMON_APOWER_TOPIC).c_str(), power);
mqttSend(getSetting("emonCurrTopic", EMON_CURRENT_TOPIC).c_str(), c);
mqttSend(getSetting("emonEnergyTopic", EMON_ENERGY_TOPIC).c_str(), e);
// Report values to Domoticz
#if ENABLE_DOMOTICZ
{
char buffer[20];
snprintf(buffer, 20, "%s;%s", power, e);
domoticzSend("dczPowIdx", 0, buffer);
snprintf(buffer, 20, "%s", e);
domoticzSend("dczEnergyIdx", 0, buffer);
snprintf(buffer, 20, "%s", c);
domoticzSend("dczCurrentIdx", 0, buffer);
}
#endif
// Reset counters
sum = measurements = 0;
}
next_measurement += EMON_INTERVAL;
}
}
#endif