Matek ELRS CRSF to SBUS converter

Specifications

Brand Name: MATEKSYS

Item Name: CRSF to SBUS Converter

Weight: 0.6g

Size: 15mm x 10mm (PCB)

Quantity: 2 Pcs

Compatible with CRSF/SBUS protocol receiver.

Support CRSF to SBUS, or SBUS to CRSF conversion

Battery voltage(RxBt) telemetry over CRSF protocol

CRSF to SBUS latency <7ms

Rated voltage: 4~5.5V @5V pad, 0~36V @VBAT pad

No 5V regulator built-in, VBAT pad is just for battery voltage sensing.

LED status:

slow blinks: CRSF-SBUS board doesn’t receive CRSF or SBUS signal, e.g., receiver is not bound with transmitter, receiver is not connected to UART of CRSF-SBUS board.

solid ON: CRSF-SBUS board and receiver are working normally.

Tool: Matek Configurator

Firmwares: crsf_sbus_fw.zip

Mar.19,2022, v1.1.0: Fixed a failsafe bug when CRSF-SBUS converter can’t get CRSF signal from receiver.

Note:

Please update the CRSF-SBUS converter with firmware v1.1.0 when you receive the first batch of boards.

Upgrade CRSF-SBUS via A or B

A. USB-TTL modules, such as CP210x, FTDI

1. Wiring

TX1 — USB-TTL module RX

RX1 — USB-TTL module TX

5V — USB-TTL module 5V

G — USB-TTL module GND

2. Bridge the jumper pad at bottom side with a drop of tin, or bridge it with tips of tweezer when powering on.

3. Connect USB-TTL module to PC,

Blue LED on CRSF-SBUS board will blink fast, it means CRSF-SBUS board is working in boot mode.

now you can remove the jumper or remove it after flashing.

4. Open Matek configurator, Select COM port of USB-TTL, Baud rate 115200, Click “Connect”

5. OpenFile “crsf_sbus_vx.x.x.bin”

6. Click “Upgrade”

7. After update, remove the jumper.

B. INAV/BF serial passthrough

1. Wiring

TX1 — FC any spare UART_RX

RX1 — FC any spare UART_TX

5V — FC 5V or 4V5

G — FC GND

2. Bridge the jumper pad at bottom side with a drop of tin, or bridge it with tips of tweezer when powering on.

3. Connect FC USB to PC

Blue LED on CRSF-SBUS board will blink fast, it means CRSF-SBUS board is working in boot mode.

now you can remove the jumper or remove it after flashing.

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-SBUS board connect to FC UART4, type “serialpassthrough 3 115200”.

6. Disconnect FC from configurator, make sure USB is still plugged in FC and LED on CRSF-SBUS board is still blinking fast.

7. Open Matek configurator, Select COM port of Flight controler, Baud rate 115200, Click “Connect”

8. OpenFile “crsf_sbus_vx.x.x.bin”

9. Click “Upgrade”

10. After update, remove the jumper.

Package Included:

1 x CRSF to SBUS Converter