//define variables int fdPin = 5; int bkPin = 7; void setup() { //set both control pins as outputs pinMode(5, OUTPUT); pinMode(7, OUTPUT); } void loop() { // repeatedly drive forward for 2 seconds, then backward for 2 seconds digitalWrite(fdPin, HIGH); delay(2000); digitalWrite(fdPin, LOW); digitalWrite(bkPin, HIGH); delay(2000); digitalWrite(bkPin, LOW); }