a freshman just entered laboratory, newcomer and a task is to use the Timer interval of 1 s of flowing water light, with a button control flow, but his writing can only control flow, and is LED lights complete flow according to always to change direction, let go will restore, also do not use the Timer interval of 1 s, also can not find the complete information on the Internet to find information to feel is too scattered, don't understand, please tell bosses
