51单片机程序，独立按键控制继电器开关，通过控制2个继电器循环工作状态，模拟洗衣机间歇正反转 一般正转3s，停止2s，然后反转3s，停止2s，循环上述动作-51 single program, separate button control relay switches, relays cycle by controlling the two working condition, simulated washing machine intermittently reversing the g