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.
LoRa chip SX126x(e.g. mR900-30, E22) and STM32WLE5xx(e.g. mR900-22, WIO-E5, E77) are compatible with each other.
Specifications
Specifications
- STM32WLE5CC with TCXO, mLRS firmware
- RF Frequency: 900MHz (868MHz, 915MHz FCC)
- RF power: -9dBm(min) / 0dBm / 10dBm / 20dBm / 22dBm(158mW)
- Antenna connector: IPEX MHF-1
- TX2/RX2: Bi-directional Serial MAVLink
- TX1: RC out(CRSF or SBUS)
- 2x buttons for Boot mode and Bind
- Power supply: 4-9V DC @ “V” Pad
- Power dissipation: Average 67mA/Peak 170mA@5V IN(31Hz, 22dbm)
- PCB Size: 24 x 15.5 mm
- Weight: 2.3g w/ antenna
- Packing:
- 1x mR900-22
- 1x IPEX MHF1 dipole antenna. 8cm
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-matek-mr900-22-wle5cc-xxx
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
- mR900-22 is NOT compatible with ELRS 900MHz / Frsky R9 series using the SX127x. They will not bind with each other.
Wiring
Modes & Link Rate
Firmware flashing
Resellers