You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
258 lines
8.8 KiB
258 lines
8.8 KiB
// -----------------------------------------------------------------------------
|
|
// Abstract Energy Monitor Sensor (other EMON sensors extend this class)
|
|
// Copyright (C) 2017-2018 by Xose Pérez <xose dot perez at gmail dot com>
|
|
// -----------------------------------------------------------------------------
|
|
|
|
#if SENSOR_SUPPORT
|
|
|
|
#pragma once
|
|
|
|
#undef I2C_SUPPORT
|
|
#define I2C_SUPPORT 1 // Explicitly request I2C support.
|
|
|
|
#include "Arduino.h"
|
|
#include "I2CSensor.h"
|
|
extern "C" {
|
|
#include "libs/fs_math.h"
|
|
}
|
|
|
|
class EmonSensor : public I2CSensor {
|
|
|
|
public:
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Public
|
|
// ---------------------------------------------------------------------
|
|
|
|
EmonSensor(): I2CSensor() {
|
|
|
|
// Calculate # of magnitudes
|
|
#if EMON_REPORT_CURRENT
|
|
++_magnitudes;
|
|
#endif
|
|
#if EMON_REPORT_POWER
|
|
++_magnitudes;
|
|
#endif
|
|
#if EMON_REPORT_ENERGY
|
|
++_magnitudes;
|
|
#endif
|
|
|
|
}
|
|
|
|
void expectedPower(unsigned char channel, unsigned int expected) {
|
|
if (channel >= _channels) return;
|
|
unsigned int actual = _current[channel] * _voltage;
|
|
if (actual == 0) return;
|
|
if (expected == actual) return;
|
|
_current_ratio[channel] = _current_ratio[channel] * ((double) expected / (double) actual);
|
|
calculateFactors(channel);
|
|
_dirty = true;
|
|
}
|
|
|
|
void resetEnergy() {
|
|
for (unsigned char i=0; i<_channels; i++) {
|
|
_energy[i] = 0;
|
|
}
|
|
}
|
|
|
|
void resetEnergy(unsigned char channel, double value = 0) {
|
|
if (channel >= _channels) return;
|
|
_energy[i] = value;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------
|
|
|
|
void setVoltage(double voltage) {
|
|
if (_voltage == voltage) return;
|
|
_voltage = voltage;
|
|
_dirty = true;
|
|
}
|
|
|
|
void setReference(double reference) {
|
|
if (_reference == reference) return;
|
|
_reference = reference;
|
|
_dirty = true;
|
|
}
|
|
|
|
void setCurrentRatio(unsigned char channel, double current_ratio) {
|
|
if (channel >= _channels) return;
|
|
if (_current_ratio[channel] == current_ratio) return;
|
|
_current_ratio[channel] = current_ratio;
|
|
calculateFactors(channel);
|
|
_dirty = true;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------
|
|
|
|
double getVoltage() {
|
|
return _voltage;
|
|
}
|
|
|
|
double getReference() {
|
|
return _reference;
|
|
}
|
|
|
|
double getCurrentRatio(unsigned char channel) {
|
|
if (channel >= _channels) return 0;
|
|
return _current_ratio[channel];
|
|
}
|
|
|
|
unsigned char getChannels() {
|
|
return _channels;
|
|
}
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Sensor API
|
|
// ---------------------------------------------------------------------
|
|
|
|
void begin() {
|
|
|
|
// Resolution
|
|
_adc_counts = 1 << _resolution;
|
|
|
|
// Calculations
|
|
for (unsigned char i=0; i<_channels; i++) {
|
|
_energy[i] = _current[i] = 0;
|
|
_pivot[i] = _adc_counts >> 1;
|
|
calculateFactors(i);
|
|
}
|
|
|
|
#if SENSOR_DEBUG
|
|
DEBUG_MSG("[EMON] Reference (mV): %d\n", int(1000 * _reference));
|
|
DEBUG_MSG("[EMON] ADC counts: %d\n", _adc_counts);
|
|
for (unsigned char i=0; i<_channels; i++) {
|
|
DEBUG_MSG("[EMON] Channel #%d current ratio (mA/V): %d\n", i, int(1000 * _current_ratio[i]));
|
|
DEBUG_MSG("[EMON] Channel #%d current factor (mA/bit): %d\n", i, int(1000 * _current_factor[i]));
|
|
DEBUG_MSG("[EMON] Channel #%d Multiplier: %d\n", i, int(_multiplier[i]));
|
|
}
|
|
#endif
|
|
|
|
_ready = true;
|
|
_dirty = false;
|
|
|
|
|
|
}
|
|
|
|
protected:
|
|
|
|
// ---------------------------------------------------------------------
|
|
// Protected
|
|
// ---------------------------------------------------------------------
|
|
|
|
// Initializes internal variables
|
|
void init() {
|
|
_current_ratio = new double[_channels];
|
|
_current_factor = new double[_channels];
|
|
_multiplier = new uint16_t[_channels];
|
|
_pivot = new double[_channels];
|
|
_current = new double[_channels];
|
|
#if EMON_REPORT_ENERGY
|
|
_energy = new uint32_t[_channels];
|
|
#endif
|
|
}
|
|
|
|
virtual unsigned int readADC(unsigned char channel) = 0;
|
|
|
|
void calculateFactors(unsigned char channel) {
|
|
|
|
_current_factor[channel] = _current_ratio[channel] * _reference / _adc_counts;
|
|
|
|
unsigned int s = 1;
|
|
unsigned int i = 1;
|
|
unsigned int m = 1;
|
|
unsigned int multiplier = 1;
|
|
while (m * _current_factor[channel] < 1) {
|
|
multiplier = m;
|
|
i = (i == 1) ? 2 : (i == 2) ? 5 : 1;
|
|
if (i == 1) s *= 10;
|
|
m = s * i;
|
|
}
|
|
_multiplier[channel] = multiplier;
|
|
|
|
}
|
|
|
|
double read(unsigned char channel) {
|
|
|
|
int max = 0;
|
|
int min = _adc_counts;
|
|
double sum = 0;
|
|
|
|
unsigned long time_span = millis();
|
|
for (unsigned long i=0; i<_samples; i++) {
|
|
|
|
int sample;
|
|
double filtered;
|
|
|
|
// Read analog value
|
|
sample = readADC(channel);
|
|
if (sample > max) max = sample;
|
|
if (sample < min) min = sample;
|
|
|
|
// Digital low pass filter extracts the VDC offset
|
|
_pivot[channel] = (_pivot[channel] + (sample - _pivot[channel]) / EMON_FILTER_SPEED);
|
|
filtered = sample - _pivot[channel];
|
|
|
|
// Root-mean-square method
|
|
sum += (filtered * filtered);
|
|
|
|
}
|
|
time_span = millis() - time_span;
|
|
|
|
// Quick fix
|
|
if (_pivot[channel] < min || max < _pivot[channel]) {
|
|
_pivot[channel] = (max + min) / 2.0;
|
|
}
|
|
|
|
// Calculate current
|
|
double rms = _samples > 0 ? fs_sqrt(sum / _samples) : 0;
|
|
double current = _current_factor[channel] * rms;
|
|
current = (double) (int(current * _multiplier[channel]) - 1) / _multiplier[channel];
|
|
if (current < 0) current = 0;
|
|
|
|
#if SENSOR_DEBUG
|
|
DEBUG_MSG("[EMON] Channel: %d\n", channel);
|
|
DEBUG_MSG("[EMON] Total samples: %d\n", _samples);
|
|
DEBUG_MSG("[EMON] Total time (ms): %d\n", time_span);
|
|
DEBUG_MSG("[EMON] Sample frequency (Hz): %d\n", int(1000 * _samples / time_span));
|
|
DEBUG_MSG("[EMON] Max value: %d\n", max);
|
|
DEBUG_MSG("[EMON] Min value: %d\n", min);
|
|
DEBUG_MSG("[EMON] Midpoint value: %d\n", int(_pivot[channel]));
|
|
DEBUG_MSG("[EMON] RMS value: %d\n", int(rms));
|
|
DEBUG_MSG("[EMON] Current (mA): %d\n", int(1000 * current));
|
|
#endif
|
|
|
|
// Check timing
|
|
if ((time_span > EMON_MAX_TIME)
|
|
|| ((time_span < EMON_MAX_TIME) && (_samples < EMON_MAX_SAMPLES))) {
|
|
_samples = (_samples * EMON_MAX_TIME) / time_span;
|
|
}
|
|
|
|
return current;
|
|
|
|
}
|
|
|
|
unsigned char _channels = 0; // Number of ADC channels available
|
|
unsigned char _magnitudes = 0; // Number of magnitudes per channel
|
|
unsigned long _samples = EMON_MAX_SAMPLES; // Samples (dynamically modificable)
|
|
|
|
unsigned char _resolution = 10; // ADC resolution in bits
|
|
unsigned long _adc_counts; // Max count
|
|
|
|
double _voltage = EMON_MAINS_VOLTAGE; // Mains voltage
|
|
double _reference = EMON_REFERENCE_VOLTAGE; // ADC reference voltage (100%)
|
|
|
|
double * _current_ratio; // Ratio ampers in main loop to voltage in secondary (per channel)
|
|
double * _current_factor; // Calculated, reads (RMS) to current (per channel)
|
|
uint16_t * _multiplier; // Calculated, error (per channel)
|
|
|
|
double * _pivot; // Moving average mid point (per channel)
|
|
double * _current; // Last current reading (per channel)
|
|
#if EMON_REPORT_ENERGY
|
|
uint32_t * _energy; // Aggregated energy (per channel)
|
|
#endif
|
|
|
|
|
|
|
|
};
|
|
|
|
#endif // SENSOR_SUPPORT
|