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ESP Drone Transmitter Controller Specification
Architecture
ESP32-based DIY drone transmitter/controller with a 0.96 in SSD1306 I2C OLED display, two analog joysticks, NRF24L01+PA+LNA 2.4 GHz RF link, optional MPU-6050 IMU, USB-C programming/power, CH340C USB-UART bridge, 2S LiPo battery input, charging/power-management, 3.3 V logic rail, status LEDs, buzzer, and user buttons.
Reference requirements
- Board size: 140 x 80 mm
- Stackup: 4-layer PCB
- MCU: ESP32, 240 MHz class module
- Display: 0.96 in OLED 128 x 64, SSD1306 I2C
- RF link: NRF24L01+ PA+LNA 2.4 GHz module, target range about 1 km
- Battery: 2S LiPo, 7.4 V nominal, 8.4 V full
- Power input: USB 5 V and 2S LiPo battery input
- Logic voltage: 3.3 V
- Control channels: 8 total, 4 ADC joystick axes plus 4 switch channels
- Target update rate: 250 Hz packet rate
Design choices
- Use ESP32-WROOM module rather than bare ESP32 for beginner-friendly RF reliability.
- Use 4-layer PCB for better RF, ground return, power integrity, and routing margin.
- Use I2C for OLED and optional IMU with shared 4.7 kΩ pull-ups.
- Use SPI for NRF24L01+ radio.
- Use named nets for all functional interfaces to keep the schematic readable.
Architecture
Reference requirements
Design choices
