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Multi-Functional 2.4 GHz RC Controller (ESP32-S3)

An ESP32-S3 based handheld 2.4 GHz wireless transmitter built for controlling robotic vehicles and embedded hardware platforms. The project includes the ESP-IDF C firmware (firmware/main/mmcontroller.c), the KiCad schematic (hardware/mfc-1.kicad_sch), and prototype build photos.

Hardware Overview

  • MCU: ESP32-S3 (ESP-IDF v5.2.2, FreeRTOS)
  • Primary Controls: Dual 2-axis Hall-effect analog gimbals read via ADC1
  • Channel Expansion: 16-channel CD74HC4067 analog/digital multiplexer (S0..S3 on GPIO 4, 5, 6, 7, SIG on GPIO 15)
  • Rotary Input: Quadrature rotary encoder tracked with the ESP32 hardware Pulse Counter (PCNT) peripheral (GPIO 16, GPIO 17, switch on GPIO 18)
  • RF Transceiver: nRF24L01+ PA+LNA 2.4 GHz SPI module (CSN: GPIO 10, CE: GPIO 9, SCK: GPIO 12, MOSI: GPIO 11, MISO: GPIO 13)
  • Display: 0.96" SSD1306 I2C OLED (SDA: GPIO 8, SCL: GPIO 14)

Repository Structure

  • firmware/ — ESP-IDF C source code and CMake configuration
  • hardware/mfc-1.kicad_sch — KiCad schematic file
  • images/ — Breadboard prototype, schematic export, and wiring diagrams

Building the Firmware

Requires ESP-IDF v5.2.2 on Linux:

source ~/esp/esp-idf/export.sh
cd firmware
idf.py set-target esp32s3
idf.py build
idf.py -p /dev/ttyACM0 flash monitor

License

MIT