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libraries/ACS712/examples/ACS712_20_AC_low_pass/ACS712_20_AC_low_pass.ino

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+//
+//    FILE: ACS712_20_AC_low_pass.ino
+//  AUTHOR: Rob Tillaart
+// PURPOSE: demo AC measurement with point to point with low pass filter
+//     URL: https://github.com/RobTillaart/ACS712
+
+
+#include "ACS712.h"
+
+
+//  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
+
+
+ACS712  ACS(A0, 5.0, 1023, 185);
+//  ESP 32 example (might requires resistors to step down the logic voltage)
+//  ACS712  ACS(25, 3.3, 4095, 185);
+
+float value  = 0;
+float weight = 0.2;
+
+void setup()
+{
+  Serial.begin(115200);
+  while (!Serial);
+  Serial.println(__FILE__);
+  Serial.print("ACS712_LIB_VERSION: ");
+  Serial.println(ACS712_LIB_VERSION);
+
+  ACS.autoMidPoint();
+
+  Serial.print("MidPoint: ");
+  Serial.println(ACS.getMidPoint());
+  Serial.print("Noise mV: ");
+  Serial.println(ACS.getNoisemV());
+  Serial.print("Amp/Step: ");
+  Serial.println(ACS.getAmperePerStep(), 4);
+
+  value = ACS.mA_AC();  // get good initial value
+}
+
+
+void loop()
+{
+  //  select sppropriate function
+  float mA = ACS.mA_AC_sampling();
+  // float mA = ACS.mA_AC();
+  value += weight * (mA - value);  // low pass filtering
+
+  Serial.print("weight: ");
+  Serial.print(weight);
+  Serial.print(" value: ");
+  Serial.print(value, 0);
+  Serial.print(" mA: ");
+  Serial.print(mA);
+  Serial.println();
+
+  delay(1000);
+}
+
+
+// -- END OF FILE --