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https://github.com/pfeerick/usb_elrs_receiver

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Host: GitHub
URL: https://github.com/pfeerick/usb_elrs_receiver
Owner: pfeerick
License: mit
Created: 2022-08-15T09:22:37.000Z (over 2 years ago)
Default Branch: master
Last Pushed: 2023-12-10T03:44:21.000Z (11 months ago)
Last Synced: 2023-12-10T04:25:01.034Z (11 months ago)
Language: C++
Size: 1.23 MB
Stars: 10
Watchers: 1
Forks: 1
Open Issues: 2
Metadata Files:
- Readme: README.md
- License: LICENSE

Awesome Lists containing this project

README

        USB CRSF/ELRS Receiver

======================

Use your ELRS transmitter as a joystick for your PC simulator using a 

microcontroller and ELRS receiver.

## Hardware Requirements / Recommendations

 - Microcontroller:

   - [Seeed Studio XIAO SAMD21](https://www.seeedstudio.com/Seeeduino-XIAO-Arduino-Microcontroller-SAMD21-Cortex-M0+-p-4426.html)

   - [Seeed Studio XIAO RP2040](https://www.seeedstudio.com/XIAO-RP2040-v1-0-p-5026.html)

 - ELRS Receiver:

   - [Happymodel EP2](http://www.happymodel.cn/index.php/2021/04/10/happymodel-2-4g-expresslrs-elrs-nano-series-receiver-module-pp-rx-ep1-rx-ep2-rx)

   - [Radiomaster RP2](https://www.radiomasterrc.com/products/rp2-expresslrs-2-4ghz-nano-receiver)

   - [iFlight ELRS Receiver](https://shop.iflight-rc.com/iFlight-ELRS-Receiver-Pro1757)

Note: While the XIAO RP2040 is supported, I recommend the XIAO SAMD21, as 

RP2040 platform support will take up some 2.5GB of space, so will take a while 

to download. I also ran into an issue on Windows 11 where the firmware could 

not be uploaded until using [Zadig](https://zadig.akeo.ie/) to install the 

`libusb-win32` driver for the `RP2 Boot2 (Interface 1)`. There is no reason the 

official Raspberry Pi Pico could not be used if you have one handy, but for 

compactness the XIAO boards are best.

The choice of ELRS receiver is up to you. The recommended receivers are due to 

the compact nature of the build, as they fit neatly within the footprint of the 

XIAO boards. 

## Device Connections: 

```

  XIAO   ---   ELRS

  =================

  5V  <－－－＞ 5V

  GND <－－－＞ GND

  RX  <－－－＞ TX

  TX  <－－－＞ RX

```

Both signal lines are 3.3V, just connect them as they are. Since this is serial 

communications, it is necessary to connect RX of one side to the TX of the 

other, and vice versa.

### XIAO SAMD21

![XIAO-SAMD21 wiring](doc/xiao-samd21-wiring.png)

### XIAO RP2040

![XIAO-RP2040 wiring](doc/xiao-rp2040-wiring.png)

As you can see from the images, the XIAO boards have a VIN and GND pin at the 

bottom, which is actually 5V and GND when the USB is plugged in. So you all the 

connections are accessible from the end with these boards, making the resulting 

build very neat. 

## Finished builds

### XIAO SAMD21 /w  Happymodel EP2 Receiver

The antenna has seen better days!

![Built SAMD21 CRSF](doc/xiao-samd21-built-unit.png)

### XIAO RP2040 /w  iFlight 2.4Ghz Receiver

This isn't as compact as some of the others, but has the added benefit of 

coming with pre-soldered wires on the receiver - just cut the plug off and 

solder the wires onto the microcontroller!

![Built RP2040 CRSF](doc/xiao-rp2040-built-unit.png)

## Acknowledgments:

Based on the project originally developed by kobatan:

- https://qiita.com/kobatan/items/40728fbb625057d9f42b

- https://qiita.com/kobatan/items/253f1614a8653a1dcb1a