Tx2/Rx2(UART2) for GPS/firmware update/setting parameters
1~10: CH1~CH10 PWM outputs
Curr: current sensor signal (0~3.3V)
Vbat(CRSF-PWM-6 and -C ): (0~36V) Battery voltage sensing
Vbat(CRSF-PWM-B) ): (6~30V) Battery voltage sensing and power supply of onboard BEC
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 (FW 1.1.1 or older)
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.
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, receiver is not connected to UART1 of CRSF-PWM board.
8x quick blinks: CRSF-PWM board received CRSF signal and failsafe value is saved. (firmware 1.1.1 or older)
solid ON: CRSF-PWM board and receiver are working normally
2x slow blinks between 8x fast blink and solid on: CLI mode is active (firmware 1.1.1 or older)
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.
modify set output_5 = ch[x] range to 1-16 , you can ramap output_5 to any CH within 1-16
modify set current_scale = range to 50-2000
Firmware v2.3.0, May 13, 2022
Add Baro_Alt telemetry ID in CRSF protocol
EdgeTX 2.7.1/OpenTX 2.3.15 or newer for Transmitter OS, ExpressLRS 2.5 or newer for TX module and Receiver.
Firmware v2.2.0, Apr.16,2022,
Fix compatibility issue with TBS Tracer/Crossfire V3. If you are using ELRS receiver, updating to V2.2.0 is not a must.
Firmware v2.1.0, Mar.1,2022,
WARNING: Failsafe settings is a must after upgrading from V1.x.x to V2.x.x
support Barometer MS5611 (I2C address 0x77) and SPL06-001 (I2C address 0x76) via I2C(DA,CL pad).
There are no I2C pull-up resistors on CRSF-PWM-6 and CRSF-PWM-C board, make sure the pull-up resistors are available on external MS5611 or SPL06-001 module. you may test the resistance between SCL and 3v3, SDA and 3v3, if there is pull-up resistor, the resistance should be 1~10K ohm.
Failsafe settings
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 at same time.
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.
Fix GPS coordinates display for Southern hemisphere & Western hemisphere
v1.1.1, Dec.05,2021
add CLI command “set output_5 = ch[x](11 or 12)”
Upgrade CRSF-PWM via A or B
A. USB-TTL modules, such as CP210x, FTDI
1. Wiring
TX2 — USB-TTL module RX
RX2 — USB-TTL module TX
4v5 — USB-TTL module 5V
G — USB-TTL module GND
2. Connect USB-TTL module to PC
3. CRSF-PWM board CLI mode will active after powering on for 10 seconds
4. Open Matek configurator, Select COM port of USB-TTL, Baud rate 115200, Click “Connect”
5. OpenFile “CRSF_pwm_vx.x.x.bin”
6. Click “Upgrade”
B. INAV/BF serial passthrough
1. Wiring
TX2 — FC any spare UART_RX
RX2 — FC any spare UART_TX
4v5 — FC 5V or 4V5
G — FC GND
2. Connect FC USB to PC
3. CRSF-PWM board CLI mode will active after powering on for 10 seconds
4. open INAV/BF configurator, connect FC to configurator
5. click INAV/BF configurator “CLI” tab, type “serialpassthrough x 115200”, x = UART number -1, e.g. CRSF-PWM board connect to FC UART4, type “serialpassthrough 3 115200”.
6. Disconnect FC from configurator, make sure USB is still plugged in FC and CRSF-PWM board is still powered on.
7. Open Matek configurator, Select COM port of Flight controler, Baud rate 115200, Click “Connect”
8. OpenFile “CRSF_pwm_vx.x.x.bin”
9. Click “Upgrade”
comparision
SKU
CRSF-PWM-6
CRSF-PWM-C
CRSF-PWM-B
CRSF-PWM-V10
CRSF-PWM-VELRS-R24-V
RF Frequency
compatible with any CRSF protocol receivers(including 433MHz, 868MHz, 915MHz, 2.4GHz)
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