Raspberry Pi project to monitor and control temperature of fermentation jars in a box. The best lacto-ferments occur around 19°C-21°C which can be hard to achieve in Britain - particularly in winter.
🚨 Work in progress
- Raspberry Pi
- DS18B20 Waterproof Digital Temperature Sensor
- 4.7k Resistor
- Breadboard Kit
- Electronics-Salon RPi Power Relay Board Expansion Module
- Heating element (TBC)
- Container (TBC)
- Thermal insulation
- M-M, M-F jumper wires
- 6 way terminal block (or WAGOs)
- Mains cabling
- Plugs and sockets
A DS18B20 is placed in an insulated box/container with fermentation jars and a heating element. These are attached to the RPi which monitors the temperature and turns on the heater if it drops too low.
Currently heating only: I will have active cooling soon, but not until UK Summer 😎.
As the heater can only be on or off (no temp control) I can't PID control so we're using bang-bang
The temperature sensor is setup following the instructions at Circuit Basics.
I learnt about the relay setup from this Explaining Computers video.
There's 2 projects in this repo, pi/ which has the code running on the RPi and /dashboard which displays the sampled data from the RPi so I can monitor; this is useful for tweaking the control algorithm.
⚠️ The RPi code is JavaScript, not Python: I know that's illegal, I don't care -- I don't know Python well enough to risk burning down my flat.
Node application that reads the temperature from /sys/bus/w1/devices/ which is written by the RPi using 1-wire protocol. It turns on/off a relay attached to the RPi based on the current temperature. It also writes all the sample data and current time to an AWS DynamoDB so it can be queried externally.
📝 TODO multiple sensors: I want to experiment with having sensors in water and in the air to see how much difference the high heat capacity of water makes in temperature lag.
A chart and a table showing basic information about time and temperature using React Material-UI
I don't know what I'm doing. I'm learning almost everything as I go. So far I've not electrocuted myself or shorted my flat but past success is no indication of future success.