ESP32 is a feature-rich MCU (microcontroller unit) with integrated Wi-Fi and Bluetooth connectivity for a wide-range of applications. S2 is supported by micropython for fast POC development.

HW: ESP32 WROOM FW: MicroPython v1.18

• define a dict to store all numbers segment mapping
• mapping ABCDEFGH segments to PINs, one bit by one

Ref: https://docs.sunfounder.com/projects/thales-kit/en/latest/led_segment_display.html#led-segment-display

74HC595 shift register IC

• use 3 GPIO (clock, latch, data), capable of output 8bits (Q0~Q7) in parallel diagram： https://microcontrollerslab.com/esp32-74hc595-4-digit-7-segment-display/

ESP32 act as Bluetooth Low Energy NUS (Nordic UART Service) app. Receive / Send data to BLE Client (phone or PC)

ESP32 act as mouse, keyboard. ref to: https://www.bilibili.com/read/cv15067064

This is Android app to interact with ESP32 BLE API26 (Oreo)