Hello, i will soon send some schematics and Photos of my Tagtool classic( can we agree on this Name?),
It is a pretty Basic build, but i stumbled over this crazy Circuitbender / Hacker Group: Gambiologia, and they made a nice Color Feedback Thing with RGB LEDs into the front cover of their tagtool Controller.
It is already old, way back in 2009, but still amazes me...
All credits for the RGB LED idea goes to them.
This is their Hardware setup , only the left of the arduino is special, the right is pretty Standard .
Tagtool arduino LED option
i found a Video on how it looks in Action: video, and Video2, but they got the conversion from the tagtool's Hue fader to the arduino's Outputs for the red, green and blue LEDs wrong, so the RGB Color does not match the Brush hue. I solved this( a minor issue in the arduino Program), so you can preview the Color you're about to paint with. I used RGB LEDs, but single separate LED work just as well. I don't remember the resistor values. Please make sure not to draw more milliAmps than the arduino can provide!
I also changed things in the nodekit (the program in the Windows PC), so you could use the tablet pen's Buttons for eraser, other brush Styles, etc.
I am not at my own Computer right now, so i cannot provide the actual files, but i 'd love to share my stuff, if there is any interest.