I am new to the forum and I have a very basic knowledge of electronics.
I am trying to use a ready made bluetooth controller that comes with an app and generates a pwm signals. Then use that signals as analog input for other purpose.
Up to this point all ok, I am able to read the signals from the analog input, and with the app shift the signals between 0 and 5V, but as soon as I plug the second circuit (two LEDs fixture), the analog signal get stuck to 5v and I am not able to control it anymore. Do I need to isolate the two circuit with an optocoupler
I have attached a schematic...any idea?