After consulting with the head of rehabilitation department, I identified a gap: currently used rehabilitation devices are either too complex or too unavailable for home use. REHABit bridges that — the therapist or patient sets a target angle in degrees on the Nextion display before each session, and the ESP32 drives the servo motors through that range of motion repeatedly.

Before each session the user inputs the desired range of motion in degrees directly on the Nextion touchscreen. The ESP32 reads that value and drives 2 servo motors via PWM through the programmed angle repeatedly. The Nextion display — built in Nextion Editor — handles all UI. The whole system runs on a 5V power bank — portable enough to use anywhere, not just a clinic.