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?

Thanks enter image description here

  • \$\begingroup\$ Where are the resistors for the LEDs? \$\endgroup\$ – Stefan Wyss Feb 4 at 11:43
  • \$\begingroup\$ the LEDs fixture are basically two LEDs strips with resistors integrated in the strip \$\endgroup\$ – vincenzo granata Feb 4 at 13:58
  • \$\begingroup\$ There's no need to isolate the circuits from each other. The LED strips are rated for 24V? You could measure/verify the voltage of the 24V PSU after connecting the LED strips. You can check the working of the LED strips seperately by disconnecting the lines from D9 and D10 on the Arduino and connect these gates of the mosfets to the buck converter (Vin of Arduino) each with a 1K resistor. \$\endgroup\$ – Huisman Feb 4 at 15:06

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