The MATEKSYS CRSF PWM C is a Crossfire to PWM Converter with 2 UARTS and 10 PWM Outputs. This converter supports any Crossfire Protocol receivers, such as the 433MHz, 868MHz, 915MHz, or 2.4GHz.

VIDEO: JB rants about CRSF to PWM converter for ELRS. Matek delivers!

Features

• Compatible with Crossfire Receivers Only
• No 5V Regulator Built-in
• Built-in Current Sensor
• Failsafe Value AutoSet
• Firmware Upgradeable
• 10 PWM Outputs
• 2 UARTS

PINOUTS AND PADS

• 4v5 pad voltage = 5V pad voltage -0.3V, make sure the voltage on the 5V pad is not higher than receiver and GPS rated voltage.
• Tx2/Rx2(UART2) for GPS/firmware update/setting parameters
• Tx1/Rx1(UART1) for CRSF protocol Receiver
• Vbat: Battery voltage sensing (0~36V)
• Curr: current sensor signal (0~3.3V)
• 1~10: CH1~CH10 PWM outputs
• G: ground

FAILSAFE

• Failsafe value is set automatically after the CRSF-PWM board is powered on and receives the CRSF signal. LED blinks 8 times quickly.
• Failsafe value = The PWM value of each channel(except CH3) when the CRSF signal is received by the CRSF-PWM board for the first time
• CH3 is specially arranged for the throttle, Failsafe value = 988 by default.
• Put the throttle joystick to the lowest point, put AIL(Roll), ELE(Pitch), RUD(Yaw) middle before powering on the receiver.

LED STATUS

• Slow blinks: CRSF-PWM board doesn’t receive a CRSF signal, e.g., the receiver is not bound with the transmitter, the receiver is not connected to UART1 of the CRSF-PWM board.
• 8x quick blinks: CRSF-PWM board received CRSF signal and failsafe value is saved.
• 2x slow blinks between 8x fast blink and solid on: CLI mode is active
• solid ON: CRSF-PWM board and receiver are working normally

GPS TELEMETRY

• Troubleshooting for no GPS telemetry, double-check the wiring between GPS and CRSF-PWM board, some u-Blox GPS may don’t output NMEA protocol, you need to be reverted GPS to the default configuration in u-center.
• Sensors(GPS, GSpd, Hdg, Alt, Sats) will blink in the Transmitter TELEMETRY tab once the CRSF-PWM board has a connection with GPS.
• GPS “TX” to CRSF-PWM board “RX” Single wire half-duplex UART connection, CRSF-PWM board “TX” to GPS “RX” is not essential.
• with OpenTX Telemetry Logging, You can plot your flight path or search the lost plane.
• u-Blox series GPS can output the “0+1 – UBX+NMEA” protocol by default
• Compatible with GPS NMEA protocol, 1Hz, Baud 9600~115200
• Support GPS Telemetry ID: GPS, GSpd, Hdg, Alt, Sats

TIM & PWM FREQUENCY

• PWM frequency on all 10x Channels can be configured according to TIM
• PWM runs at 50Hz by default
• TIM3: CH5, CH6, CH7, CH8
• TIM2: CH1, CH2, CH4
• TIM1: CH9, CH10
• TIM16: CH3

CLI MODE

• If the 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, the CRSF-PWM board can be connected to the configurator via USB-TTL module/FC passthrough.
• CLI mode has no effect on receiver CRSF signal and PWM outputs
• In CLI mode, CRSF-PWM board firmware can be updated

Specifications

• Support: Any CRSF protocol receivers (including 433MHz, 868MHz, 915MHz, 2.4GHz)
• Current sensor: Built-in (90A continuous /220A Peak), current scale = 150 by default
• Telemetry ID: RxBt, Curr, Capa, Bat%, GPS, GSpd, Hdg, Alt, Sats
• PWM frequency configurable (50Hz default, 100,160,330, 400Hz)
• 36V Max. battery voltage sense (1K:10K voltage divider built-in)
• Rated voltage: 4~9V @5V pad, 0~36V @BAT+
• Vbat and Current sensor scale configurable
• UARTs (for Receiver and GPS): 2
• Size: 26mm x 26mm
• PWM outputs: 10
• Weight: 2.8g

Includes

• 1x MATEKSYS CRSF-PWM-C Converter
• 1x Low ERS Capacitor
• 1x Dupont 2.54 Pins