Telemetry & Sensors

VBAT, RSSI, link quality and gyro telemetry back to the radio — what is exposed and what is planned.

VBAT

The receiver samples battery voltage on its ADC pin (GPIO17 on the PWMP7) and reports it back over CRSF telemetry. Wire a voltage divider from the main battery to the ADC pad; calibrate the divider ratio in the config so the radio reads the true pack voltage.

RSSI & link quality

RSSI and link quality come from the SX1280 directly and are exposed in the standard ELRS telemetry slots. Use LQ (link quality) rather than raw RSSI for range decisions — it is the more meaningful metric on 2.4 GHz.

Gyro telemetry

The Zephyrus AHRS can stream roll, pitch and yaw rate as custom telemetry so you can tune the gyro in flight or replay a flight later. This is diagnostic telemetry — keep it off the fast path in production builds to avoid flooding the link.

Planned sensors

• Barometer (BMP280) for altitude hold and glide control.
• Airspeed via a differential pressure sensor for auto-glide triggers.
• Current sensor for live power consumption and pack endurance.
• GPS for position logging and return-to-home experiments.