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3 Channel arduino Powered Christmas Light Controller!

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Step 4: Program the Arduino

The following code will cycle through turning on each relay:

void setup() {

pinMode(13,OUTPUT);
pinMode(12,OUPTUT);
pinMode(11,OUTPUT);
}

void loop() {

digitalWrite(13,HIGH);
delay(900);
digitalWrite(13,LOW);
delay(900);
digitalWrite(12,HIGH);
delay(900);
digitalWrite(12,LOW);
delay(900);
digitalWrite(11,HIGH);
delay(900);
digitalWrite(11,LOW);
delay(900);
}
 
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