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Project logs / Dirty BBQ
My goal from the beginning was to be totally web based interface. That part is functional but not nearly as pretty and polished as it can be. I'll continue to work on that aspect. The hardware section is functional and I think complete. Using DirtyPCBs made this learning process less expensive than it could have been.
Here's the boards
[attachment=3]
Basically it's 4 voltage dividers used to measure the resistance of 4 possible thermistor probes. One probe measures the internal temperature of the smoker and then based off that and a PID algorithm a DC Fan is used to act as a bellows to stoke the coals
to make them hotter if needed or it turns off to let things cool down. I've seen some folks use a damper also but I don't think it's really necessary. Since there was space I included an audible alert should things get way out of spec.I also include a I2C header if a display is desired. I'll eventually add the code for a cheap OLED.
A completed board looks like this
[attachment=2]
then populated with the BBB and fitted into an off-the-shelf case
[attachment=1]
Now all buttoned up and ready for cooking.
[attachment=0]
The other probes are used to monitor the internal temperature of the food that is cooking.
All of the code is written in javascript and is located on http://https://github.com/HouseOfBeck/BeagleQ/wiki along with schematics and more pictures.