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The RadioMaster ER4 is a compact four-channel PWM receiver built on the ExpressLRS system. It offers ultra-low latency, extended range and reliable control, with built-in voltage telemetry and easy Wi-Fi updates. It is a good match for small RC models such as light aircraft.
It outputs four PWM channels and also provides a CRSF or SBUS serial output, so it can drive servos directly or feed a flight controller. It uses a 2.54 mm connector and a standard 15 cm high-sensitivity antenna.
The receiver is powered from 4.5 to 8.4 V DC, weighs 3.0 g and measures 30 x 15 x 5 mm. ExpressLRS 3.3.0 is preinstalled, telemetry power is 10 mW and the battery voltage detection range is 4.0 to 35 V. It is compatible with all 2.4 GHz ExpressLRS modules and transmitters.
Because it is an ExpressLRS receiver, it will not bind to FrSky-style radios. Make sure your radio has an ELRS module first.
Pilots who want a simple, light ELRS receiver for a plane, glider or small vehicle.
Plug servos or an ESC into the four PWM outputs and give the receiver 4.5 to 8.4 V. To feed a flight controller instead, use the CRSF or SBUS serial output. Bind it to your ExpressLRS transmitter module, then use the web page, reached by Wi-Fi when the receiver is powered without a link, to set failsafe and other options. Keep the 15 cm antenna clear of carbon and power leads.
Four, plus a CRSF or SBUS serial output.
ExpressLRS 3.3.0.
3.0 g.
Yes, from 4.0 to 35 V.
Over Wi-Fi.
| Brand | Radiomaster |
|---|---|
| Firmware | ExpressLRS 3.3.0 |
| Power Supply | DC 4.5-8.4V |
| Weight | 3.000000 g |
| Selling unit | PCS |
