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65 lines
1.5 KiB
65 lines
1.5 KiB
/*
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EmonLiteESP
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Energy Monitor Library for ESP8266 based on EmonLib
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Currently only support current sensing
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*/
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#include "Arduino.h"
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#include "EmonLiteESP.h"
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void EnergyMonitor::initCurrent(unsigned int pin, double ref, double ratio) {
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_currentPin = pin;
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_referenceVoltage = ref;
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_currentRatio = ratio;
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_currentMidPoint = (ADC_COUNTS>>1);
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// Calculate default precision
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_currentFactor = _currentRatio * _referenceVoltage / ADC_COUNTS;
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_precision = 0;
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_multiplier = 1;
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while (_multiplier * _currentFactor < 1) {
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_multiplier *= 10;
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++_precision;
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}
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--_precision;
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_multiplier /= 10;
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};
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byte EnergyMonitor::getPrecision() {
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return _precision;
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}
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void EnergyMonitor::setPrecision(byte precision) {
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_precision = precision;
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_multiplier = 1;
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for (byte i=0; i<_precision; i++) _multiplier *= 10;
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}
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double EnergyMonitor::getCurrent(unsigned int samples) {
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int sample;
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double filtered;
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double sum;
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for (unsigned int n = 0; n < samples; n++) {
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// Read analog value
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sample = analogRead(_currentPin);
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// Digital low pass filter extracts the VDC offset
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_currentMidPoint = (_currentMidPoint + (sample - _currentMidPoint) / 1024.0);
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filtered = sample - _currentMidPoint;
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// Root-mean-square method
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sum += (filtered * filtered);
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}
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double rms = int(sqrt(sum / samples) - 0.5);
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double current = _currentFactor * rms;
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current = round(current * _multiplier) / _multiplier;
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return current;
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};
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