im doing a timing system for drag racing. it should start of with a sequence of traffic lights(l.e.ds) going from red, amber to green. once it goes to green the timers for the two cars start to measure the time of each car. upon reaching the finish line, there are infra red sensors that should stop the timing of the respective car when disturbed. i need help on how i can go about this project. the lanes in which they travel are separated by a barrier so that infra red sensors work for each car. this design is based on the pis16c84(using parallax). mainly help on the programing is required. and the circuit connections