ACS712 Current Sensor 20A Current Sensor Arus for ArduinoO

ACS712-20A

//Mengukur arus pada tegangan AC 220V dengan ACS712

//Analog Output ACS712 pada PIN A0
const int sensorIn = A0;
int mVperAmp = 100;
// use 185 for ACS712 5A
// use 100 for ACS712 20A
// use 66 for ACS712 30A

double Voltage = 0;
double VRMS = 0;
double AmpsRMS = 0;

void setup(){
Serial.begin(9600);
}

void loop(){
Voltage = getVPP();
VRMS = (Voltage/2.0) *0.707;
AmpsRMS = (VRMS * 1000)/mVperAmp;
Serial.print(AmpsRMS);
Serial.println(" Amps RMS");

}
float getVPP()
{
float result;
int readValue; //value read from the sensor
int maxValue = 0; // store max value here
int minValue = 1024; // store min value here

uint32_t start_time = millis();
while((millis()-start_time) < 1000) //sample for 1 Sec
{
readValue = analogRead(sensorIn);
// see if you have a new maxValue
if (readValue > maxValue)
{
/*record the maximum sensor value*/
maxValue = readValue;
}
if (readValue < minValue)
{
/*record the maximum sensor value*/
minValue = readValue;
}
}

// Subtract min from max
result = ((maxValue - minValue) * 5.0)/1024.0;
return result;
}