Stc15w104 button press, 6 feet p3.1 detected from 8 feet p3.3 feet per second output of 400 2.5 ms PWM square wave pulse, when the power is 4.2 v to 2.5 v, is the second output 400 2.5 ms PWM square wave, and when buttons loosen, 8 feet p3.3 no output, pulse output 20 seconds when button press, release button, no pulse, to obtain the master to help write a small program MCU,