The kit Time Measurement System for Athletics calculates the time without actually using any mathematical calculations. This kit uses the wireless concept IR. IR has the advantage of fast communication at shorter distances.
IR Transmitter and Receiver pair will be arranged at the destination point. Whenever the race starts, a stopwatch will be started. The IR transmitter and receiver pair will be facing each other in such a way that the IR signal from the IR transmitter will be received continuously by the IR receiver. This output from the IR receiver will be given to the microcontroller. The microcontroller continuously monitors this output. When the race has been started, the stop clock will be started and as the athlete tries to reach the destination, he/ she has to cross the IR pair at the destination point. Thus, the IR signal will be interrupted when any one of the athletes comes in between the IR pair, and therefore the output of the IR receiver changes. This change in the output will be detected by the microcontroller and the stop clock will be stopped as soon as this change occurs. The time taken will be displayed on LCD.