The Jolly-Mec stoves are great, but the electronics are subpar in build quality and, most importantly, interfacing!

However, the stoves are certified with these electronics, so any modification would require a new certification. Also, they work!

This project aims to solve the lack of interfacing of the Foghet 9P without doing any modifications. This can be accomplished by simply eavesdropping the traffic between the main electronics and the control panel. If desired, commands can be sent too! This communication uses a power and data bus based on the NXP TDA5051A.

I designed a board with a TDA5051A at the same settings as the bus in the Foghet 9P (125 kbps). I used the "line insulation" reference design from the chip datasheet for increased safety.

The design also features an optional switching power supply from Mean Well, which feeds off the same bus. If used, this will power the Raspberry Pi so no other power supply will be neccessary - just two wires from the Foghet 9P. UPDATE: This switching PS has a lowest rating too high for the voltage in the Jolly-Mec implementation, and doesn't start. Do not use.

Updated Jan 3, 2020: Second revision of the board with corrections and better layout!

Updated Jan 9, 2020: Third revision of the board with a smaller power/data connector so it doesn't hang over the edge of the board

Updated March 17, 2020: Fourth revision of the board to correct the Murata 78250JC footprint