ESP32-C5 tapped for 5 GHz analog FM drone video receiver
A maker has built a low-latency 5 GHz drone video receiver using an ESP32-C5's recently revealed software-defined radio capabilities and a simple resistor-ladder DAC.
Summary
The ESP32's hidden SDR facility, revealed earlier, is now appearing in practical projects. [Twotoz] has built a 5 GHz analog FM video receiver for drone use around a Seeed Studio Xiao ESP32-C5 board. The analog format remains popular in FPV drones because it avoids the digital cliff-edge effect in poor radio conditions and offers very low latency. The build uses a resistor-ladder DAC for video output, with a button interface for channel selection and a serial link for configuration.
How the receiver works
- Uses ESP32-C5, the newer variant in Espressif's lineup with the recently disclosed SDR capability
- Receives and demodulates analog FM video at 5 GHz, the standard band for FPV drone transmission
- Video output generated through a resistor-ladder DAC — no dedicated video DAC chip required
- Physical interface: button for channel switching, serial link for advanced configuration
- Built on Seeed Studio Xiao ESP32-C5 development board
- Open question: whether SDR processing latency impacts real-time FPV usability
Why it matters
This project demonstrates that the ESP32's SDR capabilities extend to 5 GHz, not just lower bands, opening the door for low-cost custom receivers in the FPV drone community. It also shows how minimal external components are needed for functional video output.
Original reference: hackaday.com →