Temperature Controlled Switch

Can be used for precise temperature control in areas like sous-vide.

This software was tested on Raspberry Pi Pico. Attached with:

• DS18B20 temperature sensor
• I2C 128*64 mono-color display
• 3 LEDs for displaying status
• Rotary encoder to set target temperature
• Relay to control heating element (for example, a cheap rice-cooker that don’t have any built-in microcontroller)

Connections:

• Temperature sensor – GP16
• I2C display: SDA – GP26, SCL – GP27
• LEDs: GREEN – GP20, YELLOW – GP19, RED – GP18
• Rotary encoder (no pullup resistor required): GP12, GP13
• Relay: Share pin with RED LED – GP18.

Status:

• Green: temperature above target (heating off)
• Red: temperature below target (heating on)
• Yellow: updating display content

Source code: https://github.com/monoKeith/Temperature-Switch

STL files: https://www.thingiverse.com/thing:4939284