Woodworker Shop Vac With Arduino Uno

/* ===========================================================

SHOP VAC AUTOMATION

->>   CONNECT RELAYS IN TO DIGITAL OUTPUT 02 + VCC + GROUND
      RELAY INTERRUPTS SHOP VAC POWER CORD 
->>   CONNECT ACS712 30A TO ANALOG INPUT A0 + VCC + GROUND
      ACS712 MUST SENSE ON THE MAIN FUSE BOX
==============================================================*/
const int analogIn = A0;
int mVperAmp = 66; // use 185 for 5A, 100 for 20A Module and 66 for 30A Module
int RawValue= 0;
int ACSoffset = 2500; 
double Voltage = 0;
double Amps = 0;

const int pinRelay = 2;


double Amps1 = 0;
double Amps2 = 0;
double Amps3 = 0;
double Amps4 = 0;
double Amps5 = 0;


void setup(){ 
 Serial.begin(9600);
 pinMode (pinRelay, OUTPUT);
}

void loop(){
 
 RawValue = analogRead(analogIn);
 Voltage = (RawValue / 1024.0) * 5000; // Gets you mV
 Amps1 = abs((Voltage - ACSoffset) / mVperAmp);

 Amps5 = Amps4; // that's just for the timing to turn off, aproximately 20 sec.
 Amps4 = Amps3;
 Amps3 = Amps2;
 Amps2 = Amps1;
 Amps = max(Amps1, Amps2);
 Amps = max(Amps, Amps3);
 Amps = max(Amps, Amps4);
 Amps = max(Amps, Amps5);

 Serial.print("Raw Value = " ); // shows pre-scaled value 
 Serial.print(RawValue); 
 Serial.print("\t mV = "); // shows the voltage measured 
 Serial.print(Voltage,2); // the '2' after voltage allows you to display 3 digits after decimal point
 Serial.print("\t Amps = "); // shows the voltage measured 
 Serial.print(Amps,2); // the '2' after voltage allows you to display 3 digits after decimal point


 if ( Amps > 6.8 ) // change value here whit the value of the machine you want to use for ( for more than one, use the lower value)
 {    digitalWrite( pinRelay, HIGH);  //  over 6.8 Amp activates the relay
      Serial.println(" High");
      delay (5000);     // wait 5 seconds
 }      

if ( Amps < 6.8 )
  {digitalWrite( pinRelay, LOW); // under 6.8 Amp the relay turns off
  Serial.println(" Low");
  }
 delay(500); 
}