Hi XTM,
Thank you so much for the instructions. I fellow your instruction and built one for my tunze 6100 pump. However, my controller didn't work. I double checked and double checked the schema and didn't see anything wrong. my controller light is on all the times and never blink. As far as the AT keyboard, I got a little bit different from what in the thread. I got brown, gray, red, silver (wires w/o plastic tube), and yellow. I used red, yellow, and siliver for the pins. Anyway, i don't really know what wrong and how to fix it. If you have any comment or suggestion, please let me know. I really appreciate it.
Thanks,
Ken