I didn’t check the actual wiring, but the resistors appear to be brown, brown, black, which is 330 ohms… Am I reading this wrong? That would make it draw about 15mA, which is within specifications… the 4k7 would be about a ma…
Why?
Changing Laser 2 should not break laser 1…?
Clear up the logic here… you have a working Ruida controller… you build a piece of unknown/untested hardware and when it doesn’t work you want to change the Ruida?
You could have easily tested this on your workbench and left the Ruida out it until you had enough confidence it was working…
This is a very simple mechanism and you have many tools others don’t. You are dealing with only two signals…
Your problem is your hardware, at least for now…
It’s should be easily connected to laser 1 that is working (?) to test it.