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FrSky Compatible Transmitter for Raspberry Pi

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# FrSky Compatible Transmitter for Raspberry Pi

Control a RC model with an FrSky receiver using a joystick and rudder pedals connected to a Raspberry Pi single-board computer.

A CC2500 module is connected to the the Raspberry Pi using the SPI bus to send FrSky compatible signals. A USB joystick, throttle control and rudder pedals can be used for control inputs.

The FrSky transmitter code is ported from [DIY Multiprotocol TX Module](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module) project.

## Project status

It's possible to bind FrSky compatible receiver to FrPi and control roll, pitch, yaw and throttle using a joystick, throttle controls and rudder pedals. (Tested with a micro quad)

Demonstration of roll, pitch, yaw and throttle:

[![Progress](https://raw.githubusercontent.com/alexbirkett/FrPi/master/video_thumbnail_2.png)](https://www.youtube.com/watch?v=UX_B3ZuB9kw)

A a FrSky compatible receiver using the FRSKY_D protocol can be bound:
[![Progress](https://raw.githubusercontent.com/alexbirkett/FrPi/master/video_thumbnail.png)](https://www.youtube.com/watch?v=Y9kTib8ejkA)

### Todo

* Command line parameters for transmitter id, binding etc
* Configure joystick(s) from the command line
* Find out why the signal from the CC2500 module is so weak compared to a Taranis radio
* Tidy up the code
* ~~Connect Raspberry Pi to CC2500 module using SPI bus~~
* ~~Bind receiver~~
* ~~Send frequency hoping data packets from FrPi to receiver~~
* ~~Write code to receive inputs from USB joystick~~

## Requirements

* Raspberry Pi single-board computers
* A CC2500 module
* USB joystick / rudder pedals

Tested with:
* Raspberry Pi Model B Rev 2
* [CC2500+PA+LNA 2.4G SPI 22dBm Wireless Data Transceiver Module CC2500 Module](https://www.aliexpress.com/item/CC2500-PA-LNA-2-4G-SPI-22dBm-Wireless-Data-Transceiver-Module/32606419424.html)

# Setup

## Install dependencies

```
sudo apt install git cmake wiringpi
```

## Set up SPI bus on Raspberry Pi

```
sudo raspi-config
```

Select:

* 5.Interfacing Options
* P4 SPI
* YES
* OK
* Finish

## Connect module

\* GDO2 is currently not used

![CC2500 module connected to Raspberry Pi](https://raw.githubusercontent.com/alexbirkett/FrPi/master/cc2500_module_connected_to_raspberry_pi.jpg)

## Build software

joystick setup is currently hardcoded in the `Multiprotocol.c` in the `main()` function.

```
git clone https://github.com/alexbirkett/FrPi.git
cd FrPi/src
mkdir build
cd build
cmake ..
make
```

## Run FrPi

On the first Raspberry Pi:

From the `FrPi/src/build` directory:

```
./frpi
```

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