Recently I’ve started making Arduino RGB strip driver cotrolled by IR diode. Firstly I coded it and tested on single RGB diode. Next I’ve bought 4x NPN transistors TIP120 and 5m led strip SMD5050 powered by 12V DC; 7.2w/m. I’ve connected it with Arduino UNO powered by power supply (DC 12v 3,33A). Colors are working great, but brightness regulation doesn’t work. Only working cofiguration is when I connect VIN pin to transistor’s emmiter pin and led strip 12V to collector, but I can’t regulate it by PWM signal from Arduino.
Do you have any ideas how to fix it?
Thanks a lot!