Matek’s Industry firstCRSFtoPWM(CrossfiretoServo) protocol converter adapter boards.
The MatekCRSF-PWM-Cconverter board has10 PWM servo outputs. Hasbuilt-in 90A continuous current sensor.

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Specifications:

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 doesnt 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 dont output NMEA protcol, you need to be reverted GPS to default configuration in u-center.
• withOpenTX Telemetry Logging, You can plot your flight path or search the lost plane.

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 doesnt 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

Includes

• 1 x CRSF-PWM-C
• 1 x low ESR capacitor
• 1 x Dupont 2.54 pins