Automate stirring and heating control system for Biology lab

Summary

The requirement here was to design a mechanism that can take care of stirring liquid at a constant speed while maintaining a constant temperature around the liquid. The features implemented in the system are:

• Stirrer with closed loop RPM feedback
• Cylindrical heater with closed loop temperature feedback
• Button to switch between setting mode to running mode
• OLED screen to show the current values (RPM and temperature) and set values
• 2 Knobs to adjust RPM and Temperature

To control RPM and temperature values, I have used L298 PWM driver. There is a separate power converter to power the ESP32 controller, to ensure the fluctuations from the load should not reset it.

I have implemented PID algorithm to ensure the smooth control of RPM of the motor.