There is another bottom CRSF-PWM PCB version in market. VBat pad is nearby CH “7”, CH”8″ is just a pad at bottom side. The silk print labelling are correct on both versions. Just follow the labelling to wire Vbat voltage and CH8 signal.
Specification
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
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)
No 5V regulator built-in, Servos must be powered via 5V pad on CRSF-PWM-V board by 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
Firmwares
2.4GHz Receiver: ExpressLRS /DIY_2400_RX_ESP8285_SX1280, V2.0 or newer
CRSF-PWM-V: crsf_pwm_v2.0 or newer
Features
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.
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
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 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 revert GPS to default configuration in u-center.
