# FazeTX2PPM

## Overview
Most standard RC transmitters are bulky, and fragile. It's always a big deal to carry them around, especially when you have small quads.

Some time ago, I bought a micro quad: the Faze from HorizonHobby. It's basically a clone of the LadyBird or the CX-10. I had a great fun flying it around, but it ended up... faulty (battery can't hold harge, some dead LEDs, and finally a dead motor). 

The transmitter is reaaally small ! So I thought I'd try to use it to fly my other quads. Indead of just replacing the PCB, I decided to keep it so I don't have to deal with the trim buttons, pots reading and conversion, ... The communication protocol is not standard so I opened the transmitter and got to work.

## Protocols
### Input Protocol

One of the advantages of this transmitter is that the RF module (a NRF24L01 or a clone, doesn't matter) is on a separate daughter board, instead of being embedded on the PCB. It makes the reserve easier (the pinout is also written on the bard) I just wired a LogicAnalyzer on the pins and sniffed the protocol.

### Output protocol: PPM

I wanted to get a standard output, so I could connect a JR or a [[..:hw:radio:taulink:]] module. PPM is the easiest solution.


## Code

Current plan is to embed a small Attiny85 inside the remote, and have a small 4pins headers sticking out of the transmitter. Stay tuned.

## Resources

* PPM
  * http://www.mftech.de/ppm_en.htm
  * https://digistump.com/board/index.php?topic=1682.0

* SPI slave
  * http://forum.arduino.cc/index.php?topic=126771.0
  * http://www.atmel.com/Images/doc2582.pdf