Introduction - If you have any usage issues, please Google them yourself
The voltmeter display value is I want AD transform the voltage values, realize 1V bright LED, LED a most bottom for minimum power is 1V, by analogy, 0 ~ 1V light RC7, 1 ~ 2V light RC7 RC6, 2 ~ RC7 3V lit RC6 RC5, 3 ~ 4V lit RC6 RC7 RC5 RC4. 4 ~ 5V RC7 RC6 RC5 RC4 RC3 light