I am trying to control 2 different addressable LED stripes with the same Arduino, one of 5V an another of 12V.
They are connected to different digital pins, the one with 5V has a power source that feeds the board as well, and then I have an external 12V source that feeds the second stripe. To make the communication of the 12V work I had to connect together the ground of the Arduino with the negative of BOTH power sources.
Individually they work fine. The problem comes when they are both running, then the 12V loses the connection and does random stuff.
It is interesting to notice that when the 5V source is off and the arduino is just fed from the laptop connection the 12V led stripe works well, but as soon as I unplug the Arduino from the laptop and I pug it to the 5V power source connection is lost
Anyone has any thought or idea of what can I try?