Obviously, when the switch is opened, dimmer #4 goes to zero, then dimmer #3 ramps down to zero, then #2, and finally #1 circuit. Help please.” I only had the Arduino UNO board and a couple of LEDs so ...

This is the circuit diagram of my quick test setup with two 5mm low ... Hopefully, this code should be easy enough to grasp and polish! /* Mouse Encoder & LED PWM Dimmer :: Arduino Sketch v1 */ int ...