/*
 * This is a test program for the switching and reversing relay shield.
 * Commands can be sent from anything - Processing, for example - or from the
 * serial monitor in the Arduino IDE. 
 * a/A turns the main relay on/off
 * b/B turns the reversing relay on/off
 * (CC-By) Fredrik Bridell 2007
 */
 
int onoff = 6;   // pin 6 switches everything on or off
int reverse = 7; // pin 7 reverses direction

void setup() {
  Serial.begin(9600);
  pinMode(onoff, OUTPUT);     
  pinMode(reverse, OUTPUT);

  // turn both releys off at startup:
  digitalWrite(onoff, LOW);
  digitalWrite(reverse, LOW);
}

void loop() {

  if (Serial.available()){
    int val = Serial.read();
    if (val == 'a'){
      digitalWrite(onoff, LOW);
    }
    if (val == 'A'){
      digitalWrite(onoff, HIGH);
    }
    if (val == 'b'){
      digitalWrite(reverse, LOW);
    }
    if (val == 'B'){
      digitalWrite(reverse, HIGH);
    }
  }
  delay(10); // enough to let you hear the relays switching - remove if you are in a hurry...
}