Matek ExpressLRS Receivers and CRSF to PWM boards

Matek (Matek Systems or MatekSys) stepped into ExpressLRS train. Matek released two ExpressLRS receivers – ELRS-R24-D and ELRS-R24-SMatek has a record of the reputable manufacturer, so the quality of their products should be high.

The first Matek ELRS-R24-D ExpressLRS receiver has diversity antennas (antenna switching diversity) and the most powerful PA/LNA on the ELRS receivers so far and is capable of outputting the 22.5dBm (~180mW) of the telemetry power. The weight of the receiver with two dipole antennas is 3 grams.

The second Matek ELRS-R24-S ExpressLRS receiver has SMD ceramic antenna

Release date:  Mid October

Prices: ELRS-R24-S – MSRP $17.99  ELRS-R24-D – MSRP $19.99

ELRS-R24-D  https://www.banggood.com/MATEKSYS-ELRS-R24-D-2_4GHz-ExpressLRS-ELRS-Diversity-Receiver-…-1900904.html

ELRS-R24-D (diversity antenna) Specifications:

  • ESP8285, SX1280IMLTRT
  • PA/LNA: SE2431L
  • Antenna connector: IPEX MHF 1
  • RF Frequency: 2.4GHz ISM
  • Telemetry power: 22.5dbm (177mW)
  • Diversity: antenna-switching, default ANT2
  • Receiver protocol: CRSF
  • Input voltage: 4~9V DC @ 5V pad
  • Power dissipation:  40~45mA(before binding), 70~75mA(binding), 90~95mA(wifi mode)
  • PCB size: 21mm x 15mm
  • Weight: 3g w/ 2x antennas
  • Packing: 1x ELRS-R24-D,   2x IPEX MHF1 Antennas

Firmware

  • ExpressLRS MATEK_2400_RX
  • ELRS-R24-D:  enable “USE_DIVERSITY” (checked) when flashing in ExpressLRS configurator

 

ELRS-R24-S https://www.banggood.com/MATEKSYS-ELRS-R24-S-2_4GHz-ExpressLRS-ELRS-Receiver-…-1900905.html

ELRS-R24-S (SMD antenna) Specifications:

  • ESP8285, SX1280IMLTRT
  • PA/LNA: AT2401C
  • molex 479480001 SMT antenna
  • RF Frequency: 2.4GHz ISM
  • Telemetry power: 20dbm (100mW)
  • Receiver protocol: CRSF
  • Input voltage: 4~9V DC @ 5V pad
  • Power dissipation:  40~45mA(before binding), 60~65mA(binding), 90~95mA(wifi mode)
  • PCB size: 21mm x 15mm
  • Weight: 1.2g
  • Packing: 1x ELRS-R24-S

Firmware

  • ExpressLRS MATEK_2400_RX
  • ELRS-R24-S:  disable “USE_DIVERSITY” (unchecked) when flashing in ExpressLRS configurator

 

Matek also released industry first CRSF to PWM (Crossfire to Servo) protocol converter adapter boards.

Matek CRSF-PWM-6 has 6 PWM servo outputs. Has integrated voltage sensor and external current sensor can be connected. PWM output frequency can be adjusted for faster servos (50Hz default, 100, 160, 330, 400Hz).

CRSF-PWM Converter, CRSF-PWM-6 specifications:

  • Compatible with CRSF protocol receiver only
  • 6x PWM outputs
  • PWM frequency configurable (50Hz default, 100,160,330, 400Hz)
  • 2x UARTs (for Receiver and GPS)
  • Telemetry ID: RxBt, Curr, Capa, Bat%, GPS, GSpd, Hdg, Alt, Sats
  • 36V Max. battery voltage sense (1K:10K voltage divider built-in)
  • Compatible with external Current sensor (0~3.3V)
  • Vbat and Current sensor scale configurable
  • Failsafe value auto set
  • Firmware upgradeable
  • Rated voltage: 4~9V @5V pad, 0~36V @Vbat, 0~3.3V @Curr
  • No 5V regulator built-in
  • 25mm x 16mm, 1.3g
  • Packing: 1x CRSF-PWM-6, Dupont 2.54 pins

 

Matek CRSF-PWM-C converter board has 10 PWM servo outputs. Has built-in 90A continuous current sensor.

CRSF-PWM Converter, CRSF-PWM-C specifications:

  • Compatible with CRSF protocol receiver only
  • 10x PWM outputs
  • PWM frequency configurable (50Hz default, 100,160,330, 400Hz)
  • 2x UARTs (for Receiver and GPS)
  • Telemetry ID: RxBt, Curr, Capa, Bat%, GPS, GSpd, Hdg, Alt, Sats
  • 36V Max. battery voltage sense (1K:10K voltage divider built-in)
  • Current sensor built-in (90A continuous /220A Peak),  current scale = 150 by default
  • Vbat and Current sensor scale configurable
  • Failsafe value auto set
  • Firmware upgradeable
  • Rated voltage: 4~9V @5V pad, 0~36V @BAT+
  • No 5V regulator built-in
  • 26mm x 26mm, 2.8g
  • Packing: 1x CRSF-PWM-C,  1x low ESR capacitor,  Dupont 2.54 pins

Pinouts and Pads

  • Tx1/Rx1(UART1) for CRSF protocol Receiver
  • Tx2/Rx2(UART2) for GPS/firmware update/setting parameters
  • 1~10: CH1~CH10 PWM outputs
  • Curr: current sensor signal (0~3.3V)
  • Vbat: Battery voltage sensing (0~36V)
  • G: ground
  • 4v5 pad voltage = 5V pad voltage -0.3V,  make sure the voltage on 5V pad is not higher than receiver and GPS rated voltage.

Failsafe

  • Failsafe value is set automatically after CRSF-PWM board is powered on and receive CRSF signal. LED blinks 8 times quickly.
  • Failsafe value = The PWM value of each channel(except CH3) when CRSF signal is received by CRSF-PWM board for the first time
  • CH3 is specially arranged for the throttle,  Failsafe value = 988 by default.
  • Usually put the Throttle  joystick to the lowest point,  put AIL(Roll), ELE(Pitch), RUD(Yaw) middle before powering on receiver.

LED status

  • slow blinks: CRSF-PWM board doesn’t receive CRSF signal, e.g., receiver is not bound with transmitter, receiver is not connected to UART1 of CRSF-PWM board.
  • 8x quick blinks: CRSF-PWM board received CRSF signal and failsafe value is saved.
  • solid ON:  CRSF-PWM board and receiver are working normally
  • 2x slow blinks between 8x fast blink and solid on: CLI mode is active

GPS telemetry

  • Compatible with GPS NMEA protocol
  • GPS “TX” to CRSF-PWM board “RX” Single wire half duplex UART connection,   CRSF-PWM board “TX” to GPS “RX” is not essential.
  • Support GPS Telemetry ID: GPS, GSpd, Hdg, Alt, Sats
  • u-blox series GPS can output “0+1 – UBX+NMEA” protocol by default
  • Sensors(GPS, GSpd, Hdg, Alt, Sats) will blink in Transmitter TELEMETRY tab once CRSF-PWM board has connection with GPS.
  • Troubleshooting for no GPS telemetry,  double check the wiring between GPS and CRSF-PWM board,  some u-blox GPS may don’t output NMEA protcol, you need to be reverted GPS to default configuration in u-center.

TIM & PWM Frequency

  • PWM frequency on all 10x Channels can be configured according to TIM
  • PWM run at 50Hz by default
  • TIM2:  CH1, CH2, CH4
  • TIM16: CH3
  • TIM3:  CH5, CH6, CH7, CH8
  • TIM1:  CH9, CH10

CLI mode

  • If CRSF-PWM board doesn’t detect GPS connected to UART2 within 10 seconds after powering on,  CLI mode will active.
  • After CLI mode is active, CRSF-PWM board can be connected to configurator via USB-TTL module/FC passthrough.
  • in CLI mode, CRSF-PWM board firmware can be updated
  • CLI mode has no effect to receiver CRSF signal and PWM outputs

Matek CRSF to PWM converter CRSF-PWM-C connection diagram:

 

Comments
  1. Marc Frank
    • montis
  2. Marc Frank
    • montis

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