ACS712 - Arduino (test)

gistfile1.ino

#define ACS712_SENSITIVITY5 0.185
#define ACS712_SENSITIVITY20 0.100
#define ACS712_SENSITIVITY30 0.066

#define ADCREF 5.0

void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  // read the input on analog pin 0:
  double current = acs712_getcurrent(A0);
  // print out the value you read:
  Serial.println(current);
  delay(1);        // delay in between reads for stability
}

double acs712_getcurrent(int analogPin) {
  int rawADC = analogRead(analogPin);
  double voltagein = map(double(rawADC), 0, 1023, 0, 5.0);
  return (double)((double)(voltagein - (double)(ADCREF/(double)2)) / (double)ACS712_SENSITIVITY20);
}