MATEKSYS CRSF-PWM-C CRSF to PWM Converter 10 PWM 50-400Hz Output 2 UARTs Bulit-in Current Sensor Failsaft Auto Set for RC Receiver

Specifications:

Brand Name: MATEKSYS

Item Name: CRSF-PWM-C Converter

Model: CRSF-PWM-C

Weight: 2.8g

Size: 26x26mm

Compatible with CRSF protocol receiver only

10x PWM outputs

PWM frequency configurable (50Hz default, 100,160,330, 400Hz)

2x UARTs (for Receiver and GPS)

Telemetry ID: RxBt, Curr, Capa, Bat%, GPS, GSpd, Hdg, Alt, Sats

36V Max. battery voltage sense (1K:10K voltage divider built-in)

Current sensor built-in (90A continuous /220A Peak),  current scale = 150 by default

Vbat and Current sensor scale configurable

Failsafe value auto set

Firmware upgradeable

Rated voltage: 4~9V @5V pad, 0~36V @BAT+

No 5V regulator built-in

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 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.

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 don’t output NMEA protcol, you need to be reverted GPS to default configuration in u-center.

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 doesn’t 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

Package included:

1 x CRSF-PWM-C

1 x low ESR capacitor

1 x Dupont 2.54 pins