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mLRS Documentation: ELRS Receivers

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Supported ELRS Receivers

As of April 2024, ELRS receivers with an ESP8285 MCU are supported by mLRS. The following targets are supported:

Target Transmit Power
Generic 900 17 dBm (50 mw)
Generic 900 PA 27 dBm (500 mw)
Generic 2400 12.5 dBm (18 mw)
Generic 2400 PA 20 dBm (100 mw)

To determine if your receiver hardware is supported, go to ELRS Targets and find the layout file of your hardware.

Notes:

  • ELRS receivers that use an ESP32 MCU are under active development.
  • 868/915 MHz ELRS receivers cannot connect with 868/915 MHz mLRS Tx modules using the SX126x LoRa chipset. This is because the 868/915 MHz ELRS receivers use the SX127x LoRa chipset, which is incompatible with the SX126x LoRa chipset for the SF6 spreading factor used by the mLRS 19 Hz mode. In addition, the SX127x does not support the SF5 spreading factor which is used for the mLRS 31 Hz mode.

Selected ELRS Receivers

The following receivers are good choices. They support ≥ 100 mW, are affordable, and have been validated by the mLRS team.

Product Name Frequency Band Transmit Power
Bayck 915M Nano Pro 868/915 MHz 27 dBm (500 mw)
SpeedyBee Nano 2.4G 2.4 GHz 20 dBm (100 mw)

Connections

All ELRS receivers have a standardized pinout and will need to be connected to the FC as follows:

Note: In order to send RC channels over the serial connection, change the Rx Snd RcChannel parameter to 'rc override'.

Flashing

  • Download the firmware for your receiver.
    • The latest pre-release is found here.
    • The latest official release is found here.
  • To prepare your receiver for flashing, you will need to connect it to a USB<>UART, follow the normal connections:
    • 5V to 5V
    • GND to GND
    • Tx to Rx
    • Rx to Tx
  • When powering on the receiver you will need to have the bind button pushed down to enter into bootloader mode.
    • For receivers with a single (non-RGB) LED you can confirm the receiver is in bootloader mode if the LED is solid.
  • Open a supported browser (Chrome, Edge, Opera, not Firefox) and navigate here.
  • Click connect and select the serial port of your USB<>UART.
  • Upload the .bin file for your receiver and click program.
  • Once the firmware has been written sucessfully, power cycle the receiver. The LED should blink to indicate that it is looking for a connection.
    • Note: Binding can be done by holding down the button for four seconds.