This project includes python code for and a walkthrough of the design of a controller for a chest freezer brew chamber. The code is written to be easy to follow for beginners.
Currently the project contains the code to turn on/off two IO ports based on the reading from a thermistor. I have tested the code using LEDs on a breadboard and it works as predicted.
The following is a list of things the controller may accomplish depending on how far you want to go with the project:
THE BARE BONES REQUIREMENTS
- Monitor ambient brew chamber air temperature
- Turn on heating if needed
- Turn on cooling if needed
SELECTING AND AUTOMATING THE PROCESS
- Ability to select different fermentation processes depending on what we are making
- Automate the fermentation process
- warmer start temperature to quickly optimize yeast colony size
- gradual cooling to optimum fermentation temperatures
- cold crash cycle when ferment is complete (requires a freezer)
- lager cycle if needed for style of beer (requires a freezer)
- Network access (SSH, WWW and/or VNC for GUI) to the controller
- Private access for control of the process
- Public access for monitoring the process
- Alarm system sends texts/emails/tweets etc.
- MySQL database to track history/store yeast statistics etc.
OTHER THINGS TO MONITOR
- Monitor fermentation vessel temperature
- Chart vessel/chamber temperature differential
- Web cam for visual monitoring
- CO2 off gassing
- Monitor rate of fermentation
- Determine when fermentation is complete
- Monitor power consumption
- Monitor keg pressures
- Monitor external/room temperature
- Monitor humidity (still not sure on this)
LOCAL INPUT GUI DEVICE
- Local LCD touchscreen GUI (doubles the expense but gives a nice professional finishing touch)
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