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0.2.2 ACS712
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rob tillaart
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697f27f05a
@ -1,87 +1,98 @@
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//
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// FILE: ACS712.cpp
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// AUTHOR: Rob Tillaart, Pete Thompson
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// VERSION: 0.2.1
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// VERSION: 0.2.2
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// DATE: 2020-08-02
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// PURPOSE: ACS712 library - current measurement
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//
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// HISTORY:
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// 0.1.0 2020-03-17 initial version
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// 0.1.1 2020-03-18 first release version
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// 0.1.2 2020-03-21 automatic formfactor test
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// 0.1.3 2020-05-27 fix library.json
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// 0.1.4 2020-08-02 Allow for faster processors
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// 0.2.0 2020-08-02 Add autoMidPoint
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// 0.2.1 2020-12-06 Add arduino-CI + readme + unittest + refactor
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// HISTORY:
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// 0.1.0 2020-03-17 initial version
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// 0.1.1 2020-03-18 first release version
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// 0.1.2 2020-03-21 automatic form factor test
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// 0.1.3 2020-05-27 fix library.json
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// 0.1.4 2020-08-02 Allow for faster processors
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// 0.2.0 2020-08-02 Add autoMidPoint
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// 0.2.1 2020-12-06 Add Arduino-CI + readme + unit test + refactor
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// 0.2.2 2021-06-23 support for more frequencies.
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#include "ACS712.h"
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ACS712::ACS712(uint8_t analogPin, float volts, uint16_t maxADC, uint8_t mVperA)
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{
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_pin = analogPin;
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_mVpstep = 1000.0 * volts / maxADC; // 1x 1000 for V -> mV
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_mVperAmpere = mVperA;
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_formFactor = 0.70710678119; // 0.5 * sqrt(2); TODO: should be smaller in practice 0.5 ?
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_formFactor = ACS712_FF_SINUS;
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_midPoint = maxADC / 2;
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_noisemV = 21; // Noise is 21mV according to datasheet
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}
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int ACS712::mA_AC(uint8_t freq)
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{
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uint32_t start = micros();
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uint16_t period = ((freq == 60) ? 16670 : 20000);
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uint16_t period = (1000000UL + freq/2) / freq;
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uint16_t samples = 0;
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uint16_t zeros = 0;
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uint16_t zeros = 0;
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int _min, _max;
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_min = _max = analogRead(_pin);
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// remove expensive float operation from loop.
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uint16_t zeroLevel = round(_noisemV/_mVpstep);
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uint32_t start = micros();
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while (micros() - start < period) // UNO ~180 samples...
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{
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samples++;
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int val = analogRead(_pin);
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if (val < _min) _min = val;
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if (val > _max) _max = val;
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if (abs(val - _midPoint) <= (_noisemV/_mVpstep)) zeros++;
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else if (val > _max) _max = val;
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if (abs(val - _midPoint) <= zeroLevel ) zeros++;
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}
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int point2point = (_max - _min);
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// automatic determine _formFactor / crest factor
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float D = 0;
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float FF = 0;
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if (zeros > samples * 0.025)
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if (zeros > samples * 0.025) // more than 2% zero's
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{
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D = 1.0 - (1.0 * zeros) / samples; // % SAMPLES NONE ZERO
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FF = sqrt(D) * 0.5 * sqrt(2); // ASSUME NON ZERO PART ~ SINUS
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D = 1.0 - (1.0 * zeros) / samples; // % SAMPLES NONE ZERO
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FF = sqrt(D) * ACS712_FF_SINUS; // ASSUME NON ZERO PART ~ SINUS
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}
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else // # zeros is small => D --> 1 --> sqrt(D) --> 1
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{
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FF = 0.5 * sqrt(2);
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FF = ACS712_FF_SINUS;
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}
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_formFactor = FF;
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// math could be partially precalculated: C = 1000.0 * 0.5 * _mVpstep / _mVperAmpere;
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// rounding?
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return 1000.0 * 0.5 * point2point * _mVpstep * _formFactor / _mVperAmpere;
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// value could be partially precalculated: C = 1000.0 * 0.5 * _mVpstep / _mVperAmpere;
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// return 1000.0 * 0.5 * point2point * _mVpstep * _formFactor / _mVperAmpere);
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return round( (500.0 * point2point) * _mVpstep * _formFactor / _mVperAmpere);
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}
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int ACS712::mA_DC()
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{
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// read twice to stabilize...
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analogRead(_pin);
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int steps = analogRead(_pin) - _midPoint;
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return 1000.0 * steps * _mVpstep / _mVperAmpere;
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// read twice to stabilize...
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analogRead(_pin);
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int steps = analogRead(_pin) - _midPoint;
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return 1000.0 * steps * _mVpstep / _mVperAmpere;
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}
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// configure by sampling for 2 cycles of AC
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// Also works for DC as long as no current flowing
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void ACS712::autoMidPoint(uint8_t freq)
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{
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uint32_t start = micros();
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uint16_t twoPeriods = ((freq == 60) ? 16670 : 20000) * 2;
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uint32_t total = 0;
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uint16_t twoPeriods = (2000000UL + freq/2) / freq;
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uint32_t total = 0;
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uint32_t samples = 0;
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while (micros() - start < twoPeriods) {
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uint32_t start = micros();
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while (micros() - start < twoPeriods)
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{
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uint16_t reading = analogRead(_pin);
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total += reading;
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samples ++;
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@ -91,4 +102,5 @@ void ACS712::autoMidPoint(uint8_t freq)
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_midPoint = total / samples;
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}
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// END OF FILE
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// -- END OF FILE --
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@ -2,7 +2,7 @@
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//
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// FILE: ACS712.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.2.1
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// VERSION: 0.2.2
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// DATE: 2020-08-02
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// PURPOSE: ACS712 library - current measurement
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//
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@ -11,7 +11,13 @@
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#include "Arduino.h"
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#define ACS712_LIB_VERSION "0.2.1"
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#define ACS712_LIB_VERSION (F("0.2.2"))
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// ACS712_FF_SINUS == 1.0/sqrt(2) == 0.5 * sqrt(2)
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// should be smaller in practice 0.5 ?
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#define ACS712_FF_SINUS (1.0/sqrt(2))
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#define ACS712_FF_SQUARE (1.0)
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#define ACS712_FF_TRIANGLE (1.0/sqrt(3))
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class ACS712
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@ -28,14 +34,18 @@ class ACS712
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// 30A 66
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ACS712(uint8_t analogPin, float volts = 5.0, uint16_t maxADC = 1023, uint8_t mVperA = 100);
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// returns mA
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// blocks 20-21 ms to sample a whole 50 or 60 Hz period.
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// lower frequencies block longer.
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int mA_AC(uint8_t freq = 50);
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// returns mA
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// blocks < 1 ms
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int mA_DC();
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// midpoint ADC for DC only
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inline void setMidPoint(uint16_t mp) { _midPoint = mp; };
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inline uint16_t getMidPoint() { return _midPoint; };
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@ -44,18 +54,23 @@ class ACS712
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// Auto midPoint, assuming zero DC current or any AC current
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void autoMidPoint(uint8_t freq = 50);
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// also known as crest factor; affects AC only
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inline void setFormFactor(float ff) { _formFactor = ff; };
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// also known as crest factor; affects mA_AC() only
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// default sinus.
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inline void setFormFactor(float ff = ACS712_FF_SINUS) { _formFactor = ff; };
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inline float getFormFactor() { return _formFactor; };
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// noise
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inline void setNoisemV(uint8_t noisemV) { _noisemV = noisemV; };
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// noise defaults 21
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inline void setNoisemV(uint8_t noisemV = 21) { _noisemV = noisemV; };
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inline uint8_t getNoisemV() { return _noisemV; };
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// AC and DC
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inline void setmVperAmp(uint8_t mva) { _mVperAmpere = mva; };
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inline uint8_t getmVperAmp() { return _mVperAmpere; };
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private:
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uint8_t _pin;
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float _mVpstep; // millivolt per step
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@ -65,4 +80,4 @@ class ACS712
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uint8_t _noisemV;
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};
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// END OF FILE
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// -- END OF FILE --
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@ -1,23 +1,24 @@
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//
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// FILE: ACS712_20_AC.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.0
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// PURPOSE: demo
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// DATE: 2020-03-18
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// (c) : MIT
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//
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#include "ACS712.h"
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// Arduino UNO has 5.0 volt with a max ADC value of 1023 steps
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// ACS712 5A uses 185 mV per A
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// ACS712 20A uses 100 mV per A
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// ACS712 30A uses 66 mV per A
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ACS712 ACS(A0, 5.0, 1023, 100);
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// ESP 32 example (requires resistors to step down the logic voltage)
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//ACS712 ACS(25, 5.0, 4095, 185);
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void setup()
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{
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Serial.begin(115200);
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@ -30,6 +31,7 @@ void setup()
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Serial.println(ACS.getNoisemV());
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}
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void loop()
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{
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int mA = ACS.mA_AC();
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@ -39,4 +41,5 @@ void loop()
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Serial.println(ACS.getFormFactor());
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}
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// END OF FILE
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// -- END OF FILE --
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@ -1,23 +1,24 @@
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//
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// FILE: ACS712_20_AC_DEMO.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.1
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// PURPOSE: demo to set midpoint and mVperAmpere for class.
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// DATE: 2020-03-18
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// (c) : MIT
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//
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#include "ACS712.h"
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// Arduino UNO has 5.0 volt with a max ADC value of 1023 steps
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// ACS712 5A uses 185 mV per A
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// ACS712 20A uses 100 mV per A
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// ACS712 30A uses 66 mV per A
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ACS712 ACS(A0, 5.0, 1023, 100);
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// ESP 32 example (requires resistors to step down the logic voltage)
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//ACS712 ACS(25, 5.0, 4095, 185);
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void setup()
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{
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Serial.begin(115200);
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@ -25,6 +26,7 @@ void setup()
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ACS.autoMidPoint();
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}
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void loop()
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{
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int mA = ACS.mA_AC();
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@ -47,4 +49,5 @@ void loop()
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delay(1000);
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}
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// END OF FILE
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// -- END OF FILE --
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@ -1,23 +1,24 @@
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//
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// FILE: ACS712_20_DC.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.0
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// PURPOSE: demo
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// DATE: 2020-03-18
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// (c) : MIT
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//
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#include "ACS712.h"
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// Arduino UNO has 5.0 volt with a max ADC value of 1023 steps
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// ACS712 5A uses 185 mV per A
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// ACS712 20A uses 100 mV per A
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// ACS712 30A uses 66 mV per A
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ACS712 ACS(A0, 5.0, 1023, 100);
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// ESP 32 example (requires resistors to step down the logic voltage)
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//ACS712 ACS(25, 5.0, 4095, 185);
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void setup()
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{
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Serial.begin(115200);
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@ -25,10 +26,12 @@ void setup()
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ACS.autoMidPoint();
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}
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void loop()
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{
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int mA = ACS.mA_DC();
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Serial.println(mA);
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}
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// END OF FILE
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// -- END OF FILE --
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@ -1,23 +1,24 @@
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//
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// FILE: ACS712_20_DC_DEMO.ino
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.0
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// PURPOSE: demo to set midpoint and mVperAmpere for class.
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// DATE: 2020-03-18
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// (c) : MIT
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//
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#include "ACS712.h"
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// Arduino UNO has 5.0 volt with a max ADC value of 1023 steps
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// ACS712 5A uses 185 mV per A
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// ACS712 20A uses 100 mV per A
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// ACS712 30A uses 66 mV per A
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ACS712 ACS(A0, 5.0, 1023, 100);
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// ESP 32 example (requires resistors to step down the logic voltage)
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//ACS712 ACS(25, 5.0, 4095, 185);
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void setup()
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{
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Serial.begin(115200);
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@ -25,6 +26,7 @@ void setup()
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ACS.autoMidPoint();
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}
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void loop()
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{
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int mA = ACS.mA_DC();
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@ -45,4 +47,5 @@ void loop()
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delay(1000);
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}
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// END OF FILE
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// -- END OF FILE --
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@ -1,23 +1,30 @@
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# Syntax Coloring Map For ACS712
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# Datatypes (KEYWORD1)
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# Data types (KEYWORD1)
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ACS712 KEYWORD1
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# Methods and Functions (KEYWORD2)
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mA_AC KEYWORD2
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mA_DC KEYWORD2
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setMidPoint KEYWORD2
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getMidPoint KEYWORD2
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incMidPoint KEYWORD2
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decMidPoint KEYWORD2
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setFormFactor KEYWORD2
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getFormFactor KEYWORD2
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setNoisemV KEYWORD2
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getNoisemV KEYWORD2
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setmVperAmp KEYWORD2
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getmVperAmp KEYWORD2
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# Constants (LITERAL1)
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ACS712_LIB_VERSION LITERAL1
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ACS712_FF_SINUS LITERAL1
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ACS712_FF_SQUARE LITERAL1
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ACS712_FF_TRIANGLE LITERAL1
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@ -19,9 +19,9 @@
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"repository":
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{
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"type": "git",
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"url": "https://github.com/RobTillaart/ACS712"
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"url": "https://github.com/RobTillaart/ACS712.git"
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},
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"version": "0.2.1",
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"version": "0.2.2",
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"license": "MIT",
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"frameworks": "arduino",
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"platforms": "*"
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@ -1,5 +1,5 @@
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name=ACS712
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version=0.2.1
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version=0.2.2
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author=Rob Tillaart <rob.tillaart@gmail.com>, Pete Thompson <pete.thompson@yahoo.com>
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maintainer=Rob Tillaart <rob.tillaart@gmail.com>
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sentence=ACS712 library for Arduino.
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@ -31,65 +31,94 @@ on the signal form. For a perfect sinus the value is sqrt(2)/2.
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#### Base
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- **ACS712(analogPin, volts = 5.0, maxADC = 1023, mVperA = 100)** constructor
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- **mA_AC(freq = 50)** blocks ~21 ms to sample a whole 50 or 60 Hz period.
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- **mA_DC()**
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- **ACS712(analogPin, volts = 5.0, maxADC = 1023, mVperA = 100)** constructor. It defaults a 20 A type sensor, which is defined by the default value of mVperA. See below.
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- **mA_AC(freq = 50)** blocks ~21 ms to sample a whole 50 or 60 Hz period. Since version 0.2.2 frequencies other than 50 and 60 are supported, the lower the frequency, the longer the blocking period.
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- **mA_DC()** blocks < 1 ms as it just needs one analogue read.
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| type sensor | mVperA | LSB 5V-10bit |
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|:-------------|:------:|:------------:|
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| 5 A | 185 | ~25 mA |
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| 20 A | 100 | ~50 mA |
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| 30 A | 66 | ~75 mA |
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#### Midpoint
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- **setMidPoint(mp)** sets midpoint ADC for DC only
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- **autoMidPoint(uint8_t freq = 50)** Auto midPoint, assuming zero DC current or any AC current
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- **getMidPoint()** read back setting
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- **incMidPoint()** manual increase midpoint (manually)
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- **decMidPoint()** manual decrease midpoint (manually)
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- **setMidPoint(mp)** sets midpoint for the ADC
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- **autoMidPoint(uint8_t freq = 50)** Auto midPoint, assuming zero DC current or any AC current. Note it will block for 2 periods. Since version 0.2.2 frequencies other than 50 and 60 are supported.
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- **getMidPoint()** read back the value set / determined.
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- **incMidPoint()** manual increase midpoint, e.g. useful to manually adjust the midPoint in an interactive application.
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- **decMidPoint()** manual decrease midpoint
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#### Formfactor
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Also known as crest factor; affects AC only.
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Default = 0.5 \* sqrt(2) = ~0.70710678...
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Also known as crest factor; affects AC signals only.
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- **setFormFactor(ff = ACS712_FF_SINUS)** manually sets form factor 0.0 .. 1.0,
|
||||
- **getFormFactor()** returns current form factor
|
||||
|
||||
The library has a number of predefined form factors
|
||||
|
||||
| definition | value | approx | notes |
|
||||
|:---------------------|:--------------|:------:|:--------|
|
||||
| ACS712_FF_SINUS | 1.0 / sqrt(2) | 0.707 | default |
|
||||
| ACS712_FF_SQUARE | 1.0 | 1.000 | |
|
||||
| ACS712_FF_TRIANGLE | 1.0 / sqrt(3) | 0.577 | |
|
||||
| | | | |
|
||||
|
||||
It is important to measure the current with a calibrated multimeter
|
||||
and determine / verify the form factor of the signal. This can help
|
||||
to improve the quality of your measurements.
|
||||
|
||||
- **setFormFactor(ff)** manually sets formfactor 0.0 .. 1.0
|
||||
- **getFormFactor()** returns current formFactor
|
||||
|
||||
#### Noise
|
||||
|
||||
Default = 21 mV.
|
||||
- **setNoisemV(noisemV)** set noise level
|
||||
|
||||
- **setNoisemV(noisemV = 21)** set noise level, is used to determine zero level e.g. in AC measurements.
|
||||
- **getNoisemV()** returns set value
|
||||
|
||||
|
||||
#### mV per Ampere
|
||||
|
||||
Both for AC and DC
|
||||
Both for AC and DC. Is defined in the constructor and depends on
|
||||
|
||||
- **setmVperAmp(mva)** sets the milliVolt per Ampere measured.
|
||||
- **getmVperAmp()** returns set value.
|
||||
|
||||
Typical values see constructor above.
|
||||
|
||||
|
||||
## Test
|
||||
|
||||
The library is tested with the RobotDyn ACS712 20A breakout and an Arduino UNO.
|
||||
The library is tested with the RobotDyn ACS712 20 A breakout and an Arduino UNO.
|
||||
|
||||
|
||||
## Operation
|
||||
|
||||
With the constructor the parameters **volts** and **maxADC (steps)** of the ADC are set
|
||||
together with the **milliVolt per Ampere** value. The last parameter can be adjusted
|
||||
afterwards, e.g. to callibrate this value runtime. Note this parameter affects both
|
||||
afterwards, e.g. to calibrate this value runtime. Note this parameter affects both
|
||||
AC and DC measurements.
|
||||
|
||||
To callibrate the zero level for DC measurements, 5 functions are available to
|
||||
To calibrate the zero level for DC measurements, 5 functions are available to
|
||||
adjust the midPoint.
|
||||
|
||||
To callibrate the RMS value for AC measurements, 2 functions are available to
|
||||
To calibrate the RMS value for AC measurements, 2 functions are available to
|
||||
get and set the formFactor.
|
||||
|
||||
To callibrate the noise level (used for AC measurements), 2 functions are available to
|
||||
To calibrate the noise level (used for AC measurements), 2 functions are available to
|
||||
get and set the noise in mV.
|
||||
|
||||
The examples show the basic working of the functions.
|
||||
|
||||
|
||||
## Future
|
||||
|
||||
- mA_AC blocks 20 ms so might affect taskscheduling on a ESP32.
|
||||
This needs to be investigated.
|
||||
- int point2point(uint8_t freq) function for AC. Is part of mA_AC() allready.
|
||||
- mA_AC blocks 20 ms so might affect task scheduling on a ESP32.
|
||||
This needs to be investigated. Probably need a separate thread that wakes up when new analogRead is available.
|
||||
- int point2point(uint8_t freq) function for AC. Is part of mA_AC() already. Needs extra global variables?
|
||||
- float frequency as parameter? Or detect zero crossing to start?
|
||||
- external analogue read support? separate class?
|
||||
|
||||
@ -1,7 +1,6 @@
|
||||
//
|
||||
// FILE: unit_test_001.cpp
|
||||
// AUTHOR: Rob Tillaart
|
||||
// VERSION: 0.1.0
|
||||
// DATE: 2020-12-06
|
||||
// PURPOSE: unit tests for the SHT31 temperature and humidity sensor
|
||||
// https://github.com/RobTillaart/SHT31
|
||||
@ -69,6 +68,7 @@ unittest(test_mA_AC)
|
||||
assertEqual(1, 1);
|
||||
}
|
||||
|
||||
|
||||
unittest(test_midPoint)
|
||||
{
|
||||
ACS712 ACS(A0, 5.0, 1023, 100); // analogPin, volts, maxADC, mVperA
|
||||
@ -95,6 +95,7 @@ unittest(test_midPoint)
|
||||
assertEqual(1000, amp);
|
||||
}
|
||||
|
||||
|
||||
unittest(test_formFactor)
|
||||
{
|
||||
ACS712 ACS(A0, 5.0, 1023, 100);
|
||||
@ -112,6 +113,7 @@ unittest(test_formFactor)
|
||||
assertMoreOrEqual(0.0001, delta);
|
||||
}
|
||||
|
||||
|
||||
unittest(test_Noise)
|
||||
{
|
||||
ACS712 ACS(A0, 5.0, 1023, 100);
|
||||
@ -124,6 +126,7 @@ unittest(test_Noise)
|
||||
assertEqual(100, nmv);
|
||||
}
|
||||
|
||||
|
||||
unittest(test_mVperAmp)
|
||||
{
|
||||
ACS712 ACS(A0, 5.0, 1023, 100);
|
||||
@ -136,6 +139,8 @@ unittest(test_mVperAmp)
|
||||
assertEqual(50, mpa);
|
||||
}
|
||||
|
||||
|
||||
unittest_main()
|
||||
|
||||
// --------
|
||||
|
||||
// -- END OF FILE --
|
||||
|
||||
Loading…
Reference in New Issue
Block a user