We want to get the Rectangular wave,the method is that Use MCU to control the Relay, The Relay have normally open contact and normally closed contact ,common pole, when you not setup the electric circuit , the common pole contact with normally closed contact , the MCU s pin connect with the conctrol pin of the Relay through triode,when mcu s io provide low level, the Relay will work ,when normally open contact pole connect with GND, normally closed contact with 12V,it will produce a wave of Rectangular

Relay.c
继电器说明(GND要共地)，控制继电器关闭状态不能太快否则高电平掉不到低电平有可能只掉到一半电压.png

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