Precise details:

MATEKSYS ELRS-R24-V 2.4GHz Vario ExpressLRS ELRS Mini RC Receiver PWM Output Barometer Integrated for RC Gliders Fixed-wings Drone

OVERVIEW:

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 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:

Brand Name: MATEKSYS

Item Name: ELRS-R24-V RC Receiver

Model: ELRS-R24-V

PCB Size: 27x16mm,

Weight: 5g w/ antenna and 2.54 pins

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

Failsafe value configurable

Firmware upgradeable

Flashing via UART:

Disconnect ESC and servos from receiver first.

Wire the receiver into the USB-TTL adapter, with TX on receiver connected to the Rx on the USB-TTL, and RX on receiver connected to the Tx of the USB-TTL. Wire 5V and GND of the USB-TTL to 5V and GND of the Receiver.

Press the boot button while powering on the receiver and CRSF-PWM board, (either button on reeciver board or button on CRSF-PWM-V board).   and release – the Red LED on receiver should now be solid. and Blue LED on CRSF-PWM-V should now be fast blink

Select the target DIY_2400_RX_ESP8285_SX1280 and  “UART” for Flashing Method,  set your bind phrase and Firmware Options and once done, click on Build and Flash.

ExpressLRS wiki

Flashing via Wifi

Disconnect ESC and servos from receiver first.

Power on receiver by 5V source. Receiver’s LED(Red) will blink slow at first, and after 20s, it should blink fast indicating it’s on Wifi Hotspot Mode.

More detailed steps,  pls refer this page.

Target: DIY_2400_RX_ESP8285_SX1280_via_WIFI

LED status:

slow blinks: CRSF-PWM board doesn’t receive CRSF signal, e.g., receiver is not bound with transmitter.

solid ON:  CRSF-PWM board and receiver are working normally

5x fast blinks after powering on for 10 seconds: CLI mode is active.

Pinouts and Pads:

Tx1/Rx1(UART1) for Receiver integrated

Tx2/Rx2(UART2) for GPS/firmware update/setting 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 settings.

Make sure ESC signal is disconnected from CRSF-PWM board before starting failsafe settings

Bridge PWM1 and PWM2 signal pad, then power on CRSF-PWM board and receiver.

Failsafe value will be saved automatically after CRSF-PWM board is powered on and receive CRSF signal. LED blinks 8 times quickly.

Failsafe value = The PWM value of each transmitter channel when CRSF signal is received by CRSF-PWM board.

Remove the jumper between PWM 1 and 2,  then CRSF-PWM board will work in normal PWM output mode.

Firmwares:

2.4GHz Receiver: ExpressLRS /DIY_2400_RX_ESP8285_SX1280,  V2.0 or newer

CRSF-PWM-V: crsf_pwm_v2.0 or newer

Note:

Receiver has ExpressLRS 2.2.0 preloaded with binding phrase “123456”,  the Receiver will never enter binding mode if using the traditional binding procedure.

It must be flashed without a binding phrase to do traditional binding OR flashed with your binding phrase.

Package Include:

1 x ELRS-R24-V (includes CRSF-PWM-V and 2.4G Receiver)

1 x IPEX MHF1 Antenna

1 x 2.54mm straight and 90° 3×6 Dupont pins