Hardware1 hOctober 14, 2026, 03:00

ESP-SDR on ESP32 Gains Transmit Capability

Developer Murmel released an early ESP32 firmware that turns the chip's 2.4 GHz radio from a listen-only SDR into a transmitter. He demoed it in gqrx using a custom Hellschreiber mode between an ESP32-S3 and ESP32-C6, and is now working on 802.15.4 modulation for possible ZigBee support.

Hackaday

Open source

ESP-SDR on ESP32 Gains Transmit Capability

ESP32 firmware now transmits on the ~2.4 GHz band and works with gqrx
Demo linked an ESP32-S3 and ESP32-C6 via a custom Hellschreiber mode
802.15.4 modulation in progress, potentially enabling ZigBee
Espressif API allows tuning the radio down to 100 MHz

#Espressif#ESP32

ESP-SDR firmware turns ESP32 into a 2.4/5 GHz software-defined radio

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ESP-SDR on ESP32 Gains Transmit Capability

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