Yesterday as I was waiting for the smoker to finish the pulled pork I had on it I I got to thinking. It was frustrating to have the temperature fluctuating so much. I had the controller set to 225ºF and it was swinging from 200º-245º which I consider to be a bit extreme.
Yes, I ordered a new controller already.
But why leave well enough alone?
In the past, I was experimenting with Cypress Semiconductor’s PSOC 5 series of system on a chip (hence SOC) controllers.
What do you need to control a pellet grill?
- Pellet auger control (120V relay)
- Fan control (120V relay, optionally PWM relay)
- Igniter control (120V relay)
- At least a couple of temperature sensors
- Display controller
- UI (i.e. touch sensor or buttons)
The PSOC5 does all that with no additional components except for solid-state relays for the 120V switching.
Not only that, but it would be able to support different varieties of sensors as well and be nothing more than a software config between RTDs and thermocouples. It also natively has capacitive touch sensor support as well.
All in a $10 chip.
Maybe I can whip something up and open source it.
Whack on some serial support and you can interface in a Raspberry Pi and get wifi and remote control.
Total BOM cost would be under around $40.