mLRS MAVLink 900MHz Receiver, mR900-Flight Control Modules-FlyChain Digital Limited (Hong Kong)

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mLRS MAVLink 900MHz Receiver, mR900

Standard

mLRS (MAVLink long range system) firmware, 900 MHz LoRa, 30 dBm RF power

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Product Detail

Product Parameter

Download STM32CubeProgrammer from ST website

https://www.st.com/en/development-tools/stm32cubeprog.html

mLRS firmware:

https://github.com/olliw42/mLRS/tree/main/firmware/pre-release-stm32
Targets:
- RX Receiver: rx-matek-mr900-30-g431kb
- TX module mode: tx-matek-mr900-30-g431kb-default
- TX SiKtelem mode: tx-matek-mr900-30-g431kb-siktelem

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Make sure DFU driver has been installed. Check out “Install DFU Drivers” in this page

Connect the Receiver USB to computer while holding the boot button in.

Select USB
USB1 and click Refresh
Connect
select “Erasing & Programming”
Tick all sectors and click “erase selected sectors”
Browse firmware (hex or bin file) related to the hardware.
Click “Start Programming”
After programming, unplug USB and plug USB back in. If red LED blinks at 2Hz, the receiver is waiting for connecting with transmitter.

*** You can also flash it via INAV or BetaFlight configurator, load firmware local, just like flashing a flight crontroller.

mLRS MAVLink 900MHz Receiver, mR900-30

mLRS (MAVLink long range system) firmware, 900 MHz LoRa, 30 dBm RF power

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Warning

MATEKSYS mLRS 900MHz series using SX126x/STM32WLE5 LoRa chip are NOT compatible with ELRS 900MHz / Frsky R9 series using the SX127x. They will not bind with each other.

https://github.com/olliw42/mLRS-docu/blob/master/docs/SX126x_SX127x_INCOMPATIBILITY.md

LoRa chip SX126x(e.g. mR900-30, E22) and STM32WLE5xx(e.g. mR900-22, WIO-E5, E77) are compatible with each other.

Specifications

STM32G431KB, mLRS firmware
LoRa SX1262 with TCXO
PA/LNA SE2435L
RF Frequency: 900MHz (868MHz, 915MHz FCC)
915MHz RF power: 21dBm(min) / 22dBm / 24dBm / 27dBm / 30dBm(1000mW)
868MHz RF power: 24dBm(min) / 24dBm / 24dBm / 27dBm / 30dBm(1000mW)
Antenna connector: IPEX MHF-1
TX1/RX1: Bi-directional Serial MAVLink
TX2: RC out(CRSF or SBUS)
one buttom for DFU mode and Bind

Power supply: 4.5-13V DC @ “V” Pad
Power dissipation: Average 340mA/Peak 850mA@5V IN(31Hz, 30dbm)
PCB Size: 29x21mm
Weight: 5.3g w/ antenna

Packing:
- 1x mR900-30
- 1x IPEX MHF1 dipole antenna. 8cm
- 1x Heatsink 20*20*6mm

LED Status

[Red flashing 2Hz], not connected to transmitter
[Green flashing 1Hz], connected to transmitter
[Red and Green alternately ], Binding mode enabled

Binding

After powering on, press the bind button (for ca. 4 seconds) on the receiver. When in bind mode, the green and red LEDs will blink alternatively with ca 2.5 Hz.
https://github.com/olliw42/mLRS-docu/blob/master/docs/BINDING.md

Firmware

mLRS https://github.com/olliw42/mLRS/tree/main/firmware/pre-release-stm32
Targets:
- RX Receiver: rx-matek-mr900-30-g431kb
- TX module mode: tx-matek-mr900-30-g431kb-default
- TX SiKtelem mode: tx-matek-mr900-30-g431kb-siktelem

Tips

mLRS Github & Documentation
mLRS Discord
mLRS Facebook group
If set RF power >=500mW, It is recommended to attach the heatsink to the bottom side of PCB. The gaps between fins can be used for mounting with M3 screws
MATEKSYS mLRS 900MHz series are NOT compatible with ELRS 900MHz & Frsky R9 series using the SX127x. They will not bind with each other.

Routing and settings

Modes & Link Rate

	50 Hz	31 Hz	19 Hz	FLRC (111 Hz)	FSK (50 Hz)
frequency bands	2.4 GHz	2.4 GHz	2.4 GHz	2.4 GHz
	/	915/868 MHz	915/868 MHz	/	915/868 MHz
	/	433 MHz/70 cm	433 MHz/70 cm	/	433 MHz/70 cm
chip sets	SX128x	SX128x	SX128x	SX128x
	/	SX126x/LLCC68	SX126x/LLCC68	/	SX126x/LLCC68
	/	STM32WLE5	STM32WLE5	/	STM32WLE5
	/	/	SX1276	/
downlink serial rate	4100 Bytes/sec	2562 Bytes/sec	1547 Bytes/sec	9111 Bytes/sec	4100 Bytes/sec
uplink serial rate	3200 Bytes/sec	2000 Bytes/sec	1207 Bytes/sec	7111 Bytes/sec	3200 Bytes/sec
receiver sensitivity	-105 dBm	-108 dBm	-112 dBm	not for LR	not for LR

Firmware flashing