该程序是用于检测直流继电器性能测试的，是用的i2c总线，可以监测继电器吸合的时间，经过调试可用。-The program is used to detect DC relay performance testing, i2c bus can pull monitoring relay time available after commissioning.

对继电器性能做了检测，吸合电压释放电压动作时间，用了PWM波(The performance of the relay is tested)