the handwired circuit also includes an Adafruit PowerBoost 500 Charger, a 3.7 V 2500 mAh LiPo battery, a IS31FL3731 Charlieplexed PWM LED driver, and a piezo buzzer. The top of the rotary encoder ...
He goes into detail regarding the waveform generation as well as making big text on the small OLED and reading the rotary encoder reliably. His schematic and source code are both available from ...
This includes lessons on using the schematic portion of the kit ... rotary sensors work and how to specify them for purchase. In our videos rotary sensors include both optical encoders and resolvers.