MATEK EXPRESSLRS ELRS 2.4GHZ VARIO RECEIVER ELRS-R24-V

• Specific for the Gliders and other fixed-wings.  Small in form factor, It can be installed in gliders with restricted payload bays such as DLG’s and high-performance slopers. Not needing to install an additional altimeter/variometer also saves room and weight.
• The built-in barometer provides vertical speed telemetry. The variometer sounds both ascending and descending tones, so you will know whether you are in a lift or sink without having to look at your transmitter.
• with ExpressLRS firmware and CRSF protocol, this will also give you other telemetry data like battery voltage, current, and GPS related.

Specifications

• ESP8285, SX1281, ExpressLRS Firmware
• RF Frequency: 2.4GHz ISM (2400~2480MHz)
• Antenna connector: IPEX MHF-1
• Telemetry power: 12dbm
• CRSF-PWM-V converter with barometer integrated
• 7x PWM outputs (6x with power rails, PWM8 is just a signal pad)
• PWM frequency: 50, 100, 160, 330, 400Hz configurable
• PWM resolution: 4x 1024 position + 3x 128 position(ExpressLRS 2.0 Wide switch mode)
• 1x UART(2) for GPS
• 36V Max. battery voltage sense (1K:10K voltage divider built-in)
• Compatible with external Current sensor (0~3.3V)
• RxBt,Curr,Capa,Bat%,GPS telemetry and VSpd(Vario)
• Rated voltage: 3.5~9V @5V pad, 0~36V @Vbat, 0~3.3V @Curr
• Power dissipation:  50mA(binding), 90mA(wifi mode)
• No 5V regulator built-in, Servos must be powered via a 5V pad on a CRSF-PWM-V board by an external 5V source.
• Failsafe value configurable
• Firmware upgradeable
• Physical:
  • PCB Size: 27x16mm,
  • Weight: 5g w/ antenna and 2.54 pins
• Packing:
  • 1x ELRS-R24-V(includes CRSF-PWM-V and 2.4G Receiver)
  • 1x IPEX MHF1 Antenna
  • 2.54mm straight and 90° 3×6 Dupont pins

Firmware

• 2.4GHz Receiver: ExpressLRS /DIY_2400_RX_ESP8285_SX1280,  V2.0 or newer
• CRSF-PWM-V: crsf_pwm_v2.0 or newer

Pinouts and Pads

• Tx1/Rx1(UART1) for Receiver integrated
• Tx2/Rx2(UART2) for GPS/firmware update parameters
• 1~8: CH1~CH8 PWM outputs
• Curr: current sensor signal (0~3.3V)
• Vbat: 0~36V Battery voltage sensing
• G: ground
• 4v5 pad voltage = 5V pad voltage -0.3V.
• no 5V regulator built-in, need to power on the board and receiver via external 5V source

Failsafe (FW 2.0.0 or newer)

• CH3 is arranged for the throttle,  Failsafe value = 988 by default.  you can change the failsafe value of CH3 and other channels by following the parameters
• Make sure the ESC signal is disconnected from the CRSF-PWM board before starting the failsafe configuration
• Bridge PWM1 and PWM2 signal pad, then power on the CRSF-PWM board and receiver.
• The failsafe value will be saved automatically after the CRSF-PWM board is powered on and receive the CRSF signal. LED blinks 8 times quickly.
• Failsafe value = The PWM value of each transmitter channel when the CRSF signal is received by the CRSF-PWM board.
• Remove the jumper between PWM 1 and 2,  then the CRSF-PWM board will work in normal PWM output mode.

LED status

• slow blinks: CRSF-PWM board doesn’t receive the CRSF signal, e.g., the receiver is not bound with the transmitter.
• solid ON:  CRSF-PWM board and receiver are working normally
• 5x fast blinks after powering on for 10 seconds: CLI mode is active

GPS telemetry

• Compatible with GPS NMEA protocol, 1Hz, Baud 9600~115200
• 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 the Transmitter TELEMETRY tab once the CRSF-PWM board has a 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 protocol, so you need to revert GPS to the default configuration in u-center.
• with OpenTX Telemetry Logging, You can plot your flight path or search for the lost plane.

VSpd telemetry

• Barometer SPL06-001 (I2C address 0x76) integrated
• VSpd telemetry is supported by ExpressLRS 2.0, EDGE 2.6, and OPENTX 2.2 or newer.

TIM & PWM Frequency

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

CLI mode

• If the 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, the CRSF-PWM board can be connected to the configurator via USB-TTL module/FC passthrough.
• in CLI mode, CRSF-PWM board firmware can be updated
• CLI mode has no effect on the receiver CRSF signal and PWM outputs

Firmware

• Pls view CRSF TO PWM CONVERTER page for the firmware update of the CRSF-PWM-V board