Using Millis to Turn On/Off Relay for a set interval

[Idahowalker]

@flashclass

int ValveRelay4 = 5; //se

better if the variable was named int unloaderValve = 5;

Gain insight to what the numbers are doing by adding Serial.prints

@flashclass

Serial.print( "currentMillis " );
Serial.print( currentMillis );
Serial.print( " psiStopTime " );
Serial.print( psiStopTime );
Serial.print( " interval " );
Serial.print( " currentMillis - psiStopTime " );
Serial.print( currentMillis - psiStopTime );
Serial.print( " solenoidInterval " );
Serial.print( solenoidInterval );
Serial.println();
if ( (currentMillis - psiStopTime) >= solenoidInterval ) 
{
    Serial.println( "tick");
    digitalWrite (ValveRelay4 , LOW);
} //cuts power to solenoid after solenoidInterval time  

Now the numbers will show their stuff.