Introduction - If you have any usage issues, please Google them yourself
It designed a 30-second timer basketball competition. This timer functions, can be directly cleared, start, pause, and a row and a photoelectric alarm function, while the application of the Seven-Segment LED to display the time. With this timer to start, pause, and continuous function, can easily achieve the timing function of a breakpoint, when the timer reduced to zero, photoelectric alarm signal will be issued.