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- add example **estimateMidPointAC.ino** #37 - update readme.md (sampling trick #38). - minor edits.
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examples/ACS712_20_AC_simulation/ACS712_20_AC_simulation.ino
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,66 @@ | ||
| // | ||
| // FILE: ACS712_20_AC_simulation.ino | ||
| // AUTHOR: Rob Tillaart | ||
| // PURPOSE: demo AC measurement with point to point | ||
| // URL: https://github.com/RobTillaart/ACS712 | ||
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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 | ||
| // ACS712 5A uses 185 mV per A | ||
| // ACS712 20A uses 100 mV per A | ||
| // ACS712 30A uses 66 mV per A | ||
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| ACS712 ACS(A0, 5.0, 1023, 100); | ||
| // ESP 32 example (might requires resistors to step down the logic voltage) | ||
| // ACS712 ACS(25, 3.3, 4095, 185); | ||
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| uint32_t start, stop; | ||
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| void setup() | ||
| { | ||
| Serial.begin(115200); | ||
| while (!Serial); | ||
| Serial.println(__FILE__); | ||
| Serial.print("ACS712_LIB_VERSION: "); | ||
| Serial.println(ACS712_LIB_VERSION); | ||
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| // select simulated signal | ||
| ACS.setADC(signal, 5, 1024); | ||
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| ACS.autoMidPoint(); | ||
| Serial.print("MidPoint: "); | ||
| Serial.print(ACS.getMidPoint()); | ||
| Serial.print(". Noise mV: "); | ||
| Serial.println(ACS.getNoisemV()); | ||
| } | ||
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| void loop() | ||
| { | ||
| delay(100); | ||
| start = micros(); | ||
| // int mA = ACS.mA_AC(); | ||
| int mA = ACS.mA_AC_sampling(50); | ||
| stop = micros(); | ||
| Serial.print("mA: "); | ||
| Serial.print(mA); | ||
| Serial.print(" time: "); | ||
| Serial.println(stop - start); | ||
| delay(5000); | ||
| } | ||
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| // simulation. | ||
| uint16_t signal(uint8_t p) | ||
| { | ||
| return round(512 + 400 * sin((micros() % 1000000) * (TWO_PI * 50 / 1e6))); | ||
| } | ||
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| // -- END OF FILE -- |
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| @@ -0,0 +1,89 @@ | ||
| // FILE: estimateMidPointAC.ino | ||
| // AUTHOR: Rob Tillaart | ||
| // PURPOSE: experimental | ||
| // URL: https://github.com/RobTillaart/ACS712/issues/37 | ||
| // | ||
| // Estimates the midpoint by taking many (short-blocking) samples | ||
| // instead of many samples in a long blocking period. | ||
| // The function adjusts the confidence (or quality) of the midpoint | ||
| // depending on the value read. | ||
| // This code is experimental and meant to investigate a non-blocking | ||
| // way to find the midPoint for the ACS712 when measuring AC currents. | ||
| // | ||
| // It will not be included in the library | ||
| // | ||
| // Use with care. | ||
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| #include "Arduino.h" | ||
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| uint32_t start, stop; | ||
| int _pin = A0; | ||
| uint32_t count = 0; | ||
| volatile uint16_t mp; | ||
| float conf = 0; | ||
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| uint16_t estimateMidPointAC(float &confidence, bool reset = false) | ||
| { | ||
| static bool _firstCall = true; | ||
| static float _minimum, _maximum, _confidence; | ||
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| int value = analogRead(_pin); | ||
| if (_firstCall || reset) | ||
| { | ||
| _firstCall = false; | ||
| _minimum = _maximum = value; | ||
| _confidence = 0; | ||
| confidence = _confidence; | ||
| return _minimum; | ||
| } | ||
| if (value > _maximum) | ||
| { | ||
| _maximum = value; | ||
| _confidence /= 2; | ||
| } | ||
| else if (value < _minimum) | ||
| { | ||
| _minimum = value; | ||
| _confidence /= 2; | ||
| } | ||
| else if (_confidence < 100) | ||
| { | ||
| _confidence += 1; | ||
| } | ||
| confidence = _confidence; | ||
| return (_minimum + _maximum) / 2; | ||
| } | ||
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| void setup() | ||
| { | ||
| Serial.begin(115200); | ||
| while (!Serial); | ||
| Serial.println(__FILE__); | ||
| } | ||
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| void loop() | ||
| { | ||
| count++; | ||
| start = micros(); | ||
| mp = estimateMidPointAC(conf, true); | ||
| stop = micros(); | ||
| Serial.print(millis()); | ||
| Serial.print("\t"); | ||
| Serial.print(count); | ||
| Serial.print("\t"); | ||
| Serial.print(conf); | ||
| Serial.print("\t"); | ||
| Serial.print(mp); | ||
| Serial.print("\t"); | ||
| Serial.print(stop - start); | ||
| Serial.println(); | ||
| delay(random(100)); | ||
| } | ||
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| // -- END OF FILE -- |
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| Original file line number | Diff line number | Diff line change |
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| @@ -1,5 +1,5 @@ | ||
| name=ACS712 | ||
| version=0.3.6 | ||
| version=0.3.7 | ||
| author=Rob Tillaart <[email protected]>, Pete Thompson <[email protected]> | ||
| maintainer=Rob Tillaart <[email protected]> | ||
| sentence=ACS712 library for Arduino. | ||
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