const int relay = 2;
const int sensorIn = A0;
int mVperAmp = 100; // use 100 for 20A Module and 66 for 30A Module
int relaystate;
double sensorVal;

void setup() {
  Serial.begin(9600);
  pinMode(relay, OUTPUT);
  pinMode(sensorIn, INPUT);
  digitalWrite(relay, LOW);
}

void loop() {

  delay(500);
  relaystate = digitalRead(relay);   //Check if the fan is on/off
  sensorVal = getVPP();
  Serial.println(sensorVal); //Printing out the AmpsRMS

  while(sensorVal >= .50) {
    digitalWrite(relay, HIGH);  //If the current is drawing, then turn on fan
    delay(3000);
    Serial.println(sensorVal);
  }
  if (sensorVal < .50) { //If projector turns off, wait 1 minute and turn off fan
    Serial.println("Projector off, waiting one minute to cool off.");
    delay(60000);
    digitalWrite(relay, LOW);
   }
}

float getVPP() {
  double Voltage = 0;
  double VRMS = 0;
  double AmpsRMS = 0;

  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
  //  Serial.print(maxValue);
  //  Serial.println(" Max Value");
  //  Serial.print(minValue);
  //  Serial.println(" Min Value");
  Voltage = ((maxValue - minValue) * 5.0) / 1024.0;
  VRMS = (Voltage / 2.0) * 0.707;
  AmpsRMS = (VRMS * 1000) / mVperAmp;

  return AmpsRMS;
}