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ExpressLRS/ELRS 2.4GHZ 7ch PWM Vario Receiver
Brand: Matek
Product Code: ELRS-R24-V
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ExpressLRS/ELRS 2.4GHZ 7ch PWM Vario Receiver
Description
1. Product Summary
1.1. Product Description
The Matek ExpressLRS / ELRS 2.4 GHz Vario Receiver is an advanced receiver module operating in the 2.4 GHz ISM band. Designed for long-range RC aircraft, FPV drones, and UAVs, it combines the high-performance ExpressLRS control link with a built-in variometer (barometric sensor) for altitude and vertical speed telemetry. Available in models such as ELRS-R24-V and ELRS-R24-P6V, this receiver provides up to 6 or 7 PWM outputs, making it ideal for fixed-wing applications and gliders requiring analog servo control with full telemetry feedback.
1.2. Product Features
- Operating frequency: 2.4 GHz ISM band (2400 – 2480 MHz).
- Powered by ExpressLRS firmware on ESP8285 or ESP32-PICO-D4 + SX1281 RF chip.
- Integrated barometric sensor for real-time altitude and variometer telemetry.
- Supports 6 – 7 PWM output channels depending on model variant.
- Full telemetry feedback via CRSF protocol: voltage, current, capacity, GPS, altitude, and vario data.
- IPEX / MHF-I antenna connector for flexible installation.
- Compact, lightweight, and designed for gliders, UAVs, and fixed-wing RC aircraft.
- Requires external 5 V power supply for PWM servos / ESCs (no onboard BEC).
- Firmware configurable and upgradable via ExpressLRS WebUI or UART interface.
2. Technical Specifications
Table 2-1. ELRS 2.4 GHz Vario Receiver Specifications
| Parameter | Specification |
|---|---|
| Frequency Band | 2.4 GHz (2400 – 2480 MHz) |
| RF Chipset | SX1281 + ESP8285 / ESP32-PICO-D4 |
| Firmware | ExpressLRS (Open Source) |
| PWM Outputs | 6 / 7 channels (depends on model) |
| Telemetry Functions | Voltage, Current, Capacity, GPS, Altitude, Vario |
| Integrated Sensor | Barometer (Vario / Altimeter) |
| Input Voltage | 5 V (external BEC required) |
| Antenna Connector | IPEX / MHF-1 |
| Protocol | CRSF / PWM / Telemetry Feedback |
| Dimensions | Approx. 30 mm × 18 mm |
| Weight | ≈ 4 g (with antenna) |
3. Applications
- Fixed-Wing Aircraft: Ideal for gliders and FPV planes requiring analog servos and telemetry.
- UAV / Drone Systems: Long-range link with built-in altitude and vario sensor for telemetry monitoring.
- FPV Racing / Long-Range Projects: Reliable ExpressLRS 2.4 GHz control with real-time feedback.
- Experimental Platforms: Suitable for integrating CRSF protocol receivers into research or hybrid builds.
4. Installation & Usage Notes
- Provide an external 5 V power source for PWM servos / ESCs — no built-in BEC.
- Mount the receiver away from high-current power lines to reduce RF interference.
- Use high-quality IPEX antennas and keep the RF path clear of metal or carbon fiber obstructions.
- For binding and firmware updates, use the ExpressLRS Configurator or Web UI via UART.
- Activate vario telemetry on the transmitter by enabling baro sensor output in CRSF configuration.
5. Integration Considerations
- Ensure the receiver is powered from a stable 5 V supply to avoid signal loss during telemetry transmission.
- Vario data is transmitted in real time through the CRSF link — ideal for gliders and aerobatic planes needing precise climb and sink readings.
- Pairs seamlessly with ExpressLRS transmitters (2.4 GHz TX modules and radio links).
- Supports firmware updates and configuration through Wi-Fi (ESP32) or UART (ESP8285 version).
6. Practical Summary
The Matek ELRS 2.4 GHz Vario Receiver combines ExpressLRS long-range digital link reliability with integrated altitude and variometer telemetry for high-precision flight control. Compact, lightweight, and fully telemetry-enabled, it is perfect for fixed-wing pilots and UAV builders who require both servo PWM outputs and real-time flight data without additional sensors. With firmware upgradable design and ExpressLRS ecosystem compatibility, it offers professional-grade stability and flexibility for modern RC applications.
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