The control of the digitizer consists of a PC (laptop) running (through Virtualbox) Linux mint. A C++ program (control) reads the serial port of the ESP32 and captures the frame by invoking the fswebcam program to get a picture from the microscope.

The ESP32 runs a program (stepper) which gets commands through the serial ports to run the stepper motors and sends back a notification when the stepper motor has reached its target position.

A variable PWM module (powered from the ESP32) controls the strength of the LED.