Hey guys,
This is my first post here, so thanks in advance for your help! I have a Printrbot with a Printrboard Rev. F board driving it that I would like to use to control a laser driver board. I am interested in the 0-5v TTL laser driver from China that is prevalent on eBay. I already have a 3.5 watt 445nm laser diode that I want to drive with it.
After many hours investigating I have narrowed my options to three. Reducing the PWM fan output signal to 0-5v to drive the diode board, adjusting the firmware to specify a 5v pin for the fan output instead of the current pin, and moving to one of the 5v extension pins.
My problem is I can't seem to come up with a complete plan to pull off any of these three options. From my multimeter testing I get 6 to 12 volts from the PWM fan pin from 0 to 100 percent. I'm not sure how to use a voltage divider to drive this to 0-5v. For the firmware and pin changes I can't seem to find complete enough documentation for a pin out. If I find a pinout and move to extension pins how do I control these with the Printrboard m-codes?
Thanks guys!