4个激光发射，分别为1234，4个对应的接受1234，

分成四组，分别为12、23、34、41，,当按键按下后发射

出来一道激光(1)，达到对应的接受盒上，要求客户在4S

内阻挡，如超过4S，则失败，失败后需要重新按下按键。

如客户完成阻挡后，则激光熄灭，3S后，又一道激光打出

(2)，还是同样的要求，如失败则从头再来。以此类推。

分别是3，4,一共四组，如这四次客户都在规定的时间内

达到要求，则开启一个继电器。-4 laser emission, respectively, a corresponding acceptance 1234,4 1234, divided into four groups, namely 12,23,34,41 ,, on when a button is pressed emitted laser (1), to accept the corresponding box requiring customers to stop in the 4S, such as more than 4S, the failure, after the failure to re-press the button. If the customer after the completion of the barrier, the laser is off, 3S after he hit a laser (2), or the same requirements, such as the failure to start over. And so on. 3 and 4, respectively, a total of four groups, such as that four customers are within a predetermined period of time to meet the requirements, then open a relay.