Introduction - If you have any usage issues, please Google them yourself
A/D conversion: read into the potentiometer voltage at the tap V0, and to determine the comparison. LED3, LED4 light voltage 2V <V0 <3V, LED3, LED4, LED5 light when the voltage 3V <V0 <2V, when the voltage is 3V <V0 < LED4, LED5, LED6 and LED6 are lit when the voltage is 4V <V0 <5V, and the LED3, LED4, LED5,