int foo = 13; int inByte = 1; // first analog sensor void setup() { Serial.begin(9600); pinMode(foo, INPUT); establishContact(); } void loop() { if(Serial.available()> 0){ inByte = Serial.read() ; foo = analogRead (13); Serial.write(foo); int coilState = digitalRead (foo); //Serial.println(coilState); if(coilState == 1) { Serial.println("ON"); } delay(1); } } void establishContact () { while (Serial.available() <= 0) { Serial.print('A'); delay (300); } }