说明：  基于单片机的抢答器。抢答时间为7s，7s倒计时结束到，全部选手都不能按，只能等待主持人按下重新按钮。有7个选手的抢答按钮，一个主持人的按钮。7个选手任意一个抢答之后，数码管会显示选手号码，其他选手不能抢答。主持人按下重新按钮之后，选手又可以进入抢答环节。
(Based on Single Chip Responder. Answer time is 7s, 7s countdown to the end, all the players can not press, can only wait for the host to re-press the button. There are seven players Responder button, a host button. 7 players after an arbitrary answer, digital displays player numbers, the other players can not answer. Press the button again after the host, and players can enter the answer in part.)