Long time ago during the Google+ time I shared some info about my PCB that adds some safety and comfort features to the K40. 2 years later I found the time to document it.
- Interlock functions for the doors
- Interlock for water temperature and flow
- Automatic start and afterrun for 4 relay outputs (AC 115V/230V) and two 12V DC outputs
If you are interested, everything is freely available on Hackaday.io.
I was using only a single sided PCB and through hole compenents. So it is easy to etch a PCB.