This project implements a simple timer and PID controller for a dumb slow cooker to become both a timer enabled slow cooker and a simple sous-vide cooker.
The goal is to have a solid state relay control a simple crock-pot (or other compatible simple slow cooker that comes without any electronics). The usage of such contraption is both to add a timer to that slow cooker, and optionally hold a set temperature (when PID control is enabled in setup screen).
You will need a couple of components:
- Wemos D1 Mini - or a clone
- DS18B20 Waterproof Temp sensor
- Solid state relay (DC control, AC output)
- SH1106Spi display
- Rotary encoder
- Power cable
- 5V power adaptor circuit (i.e. something that converts wall socket power to 5V for the Wemos D1)
- Your local wall mounted power socket (or a cable power socket)
- An enclosure - a 3d printable model is in model/ directory (written in openSCAD) - I used universal pcb mounted into the frame, and an a gutted old phone charger for the power supply (so the power supply mount will have to be modified for your situation). Lacking any other, I used M3/16 screws everywhere but the display, which uses 4x M3/10 screws (16 were too long). Sorry the code is a bit messy.
GNDis the D1's ground pin3.3Vis the D1's 3V pin
The Black wire connects to GND, Red wire to 3.3V, Yellow wire to D4
The DC part connects - to GND, + to D8
The AC part connects one power wire through the relay (as appropriate to your country). Ground wire connects directly through to the output socket.
These are the display's connections:
D7-SDAD5-SCKD3-RSTD1-DCGND-CS3.3V-VDD
Due to the limited number of pins, A0 is used as a button detection pin.
3.3V- pin marked5VGND-GNDA0-KEYD2-S1D0-S2
The input power gets connected to the power adaptor.
Power adaptor output connects to 5V and GND leads of the Wemos D1.
Here are some assembly photos for easier orientation:
