DIY 1800w Hot Plate & Stirrer

Hi everyone, I made a DIY hot plate and stirrer. The power of heater is 1850w. It uses 5 heater cartridges. Motor runs at 20KHz to prevent loud whine. Everything is controlled via esp32. Hot plate is controlled via PID algorithm. I have also included code for auto-tuning PID. This project is very useful for chemistry experiments.

Main components are:

1x Solid State Relay

1x L298N motor driver

1x ESP-32

1x Thermistor

1x 0.96" Oled

1x Rotary Encoder

1x Potentiometer

1x 12V Power supply

5x 110V 370W Heater Cartridges

1x custom made aluminium housing

4x M3*50mm screws

Other tools / items:

3d printer

wood screws

two wooden planks

Arduino code, 3d models, etc. (will make more updates and upload them asap)

https://github.com/MrSimranjitSingh/Tea_Maker

Make a big hole for you motor (to be used as a stirrer) and four small holes for you hot plate. Also make holes on side of the wooden planks for 3d printed walls.

Make connections according to the provided schematic.

Mount everything on second wooden plank with 3d printed feet. Upload code to esp32.

Mount heater and motor on top wooden plank.

Connect both wooden planks with 3d printed walls and wood screws to make a box.

Test motor by rotating the potentiometer.

Test heater cartridge by rotating the rotary encode and pushing the rotary encoder to set the setpoint. The light on SSR should start blinking. Turn it off immediately afterwards. The thermistor should always be placed in / on the material you are heating, otherwise the aluminium housing will weld to itself.

I make tea with it 😎😎😎 & mix some copper sulphate with it (never keep chemicals and food products together, cooper sulphate is toxic).