Quote Originally Posted by Doddy View Post
Hmmm, that module you linked converts (or claims to convert) a PWM signal into an analogue signal. All three input methods on the laser control board are TTL/PWM. If your intent is to use that board with the laser to control power, I don't understand how the laser is intended to take an analogue voltage.

Edit:

Consider also the Arduino PWM outputs, if using the built in libraries (counter driven PWM) operate around 500Hz.. That module claims 1kHz -> 3kHz operation. Just a health-warning on compatibility.
I'm getting confused.. on the laser board it only says TTL not PWM I thought it may need a PWM to TTL conversion.