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90 lines
1.8 KiB
C++
90 lines
1.8 KiB
C++
// FILE: estimateMidPointAC.ino
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// AUTHOR: Rob Tillaart
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// PURPOSE: experimental
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// URL: https://github.com/RobTillaart/ACS712/issues/37
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//
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// Estimates the midpoint by taking many (short-blocking) samples
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// instead of many samples in a long blocking period.
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// The function adjusts the confidence (or quality) of the midpoint
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// depending on the value read.
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// This code is experimental and meant to investigate a non-blocking
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// way to find the midPoint for the ACS712 when measuring AC currents.
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//
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// It will not be included in the library
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//
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// Use with care.
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#include "Arduino.h"
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uint32_t start, stop;
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int _pin = A0;
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uint32_t count = 0;
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volatile uint16_t mp;
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float conf = 0;
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uint16_t estimateMidPointAC(float &confidence, bool reset = false)
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{
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static bool _firstCall = true;
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static float _minimum, _maximum, _confidence;
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int value = analogRead(_pin);
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if (_firstCall || reset)
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{
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_firstCall = false;
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_minimum = _maximum = value;
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_confidence = 0;
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confidence = _confidence;
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return _minimum;
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}
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if (value > _maximum)
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{
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_maximum = value;
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_confidence /= 2;
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}
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else if (value < _minimum)
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{
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_minimum = value;
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_confidence /= 2;
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}
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else if (_confidence < 100)
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{
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_confidence += 1;
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}
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confidence = _confidence;
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return (_minimum + _maximum) / 2;
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}
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void setup()
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{
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Serial.begin(115200);
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while (!Serial);
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Serial.println(__FILE__);
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}
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void loop()
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{
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count++;
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start = micros();
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mp = estimateMidPointAC(conf, true);
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stop = micros();
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Serial.print(millis());
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Serial.print("\t");
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Serial.print(count);
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Serial.print("\t");
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Serial.print(conf);
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Serial.print("\t");
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Serial.print(mp);
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Serial.print("\t");
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Serial.print(stop - start);
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Serial.println();
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delay(random(100));
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}
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// -- END OF FILE --
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