DIY-Multiprotocol-TX-Module/README.md

# DIY-Multiprotocol-TX-Module
Multiprotocol is a TX module which enables any TX to control lot of different models available on the market.

[Main Thread on RCGROUPS](http://www.rcgroups.com/forums/showthread.php?t=2165676)

![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/t7952733-114-thumb-P4100002.JPG?d=1433910155) ![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/t7952734-189-thumb-P4100003.JPG?d=1433910159)

##Compatible TX

###Using standard PPM output (trainer port)
The multiprotocol TX module can be used on any TX with a trainer port.

Channels order is AETR by default but can be changed in the source code.

The protocol selection is done via a dip switch or a rotary dip switch for access to up to 15 different protocols.

###Using a serial output
The multiprotocol TX module can be used on a Turnigy 9X, 9XR, 9XR Pro, Taranis, ... running er9x or ersky9X. (A version for OpenTX is being looked at)

Channels order is AETR by default but can be changed in the source code.

This enables full integration using the radio GUI to setup models with all the available protocols options.

![Screenshot](http://static.rcgroups.net/forums/attachments/1/1/5/4/3/7/t8520065-194-thumb-IMG_20151217_002215%20%28Medium%29.jpg?d=1450308588)

Options are:
- Protocol and type: many main protocols have variants
- RX Num: number your different RXs and make sure only one model will react to the commands
- Power: High or low, enables to lower the power setting of your TX (indoor for example). 
- Option: -127..+127 allowing to set specific protocol options. Like for Hubsan to set the video frequency.
- Bind: bind a RX/model
- Autobind: Yes or No. At the model selection (or power applied to the TX) a bind sequence will be initiated
- Range: test range by setting the transmission power to the lowest value

##Protocols

###TX ID
Each protocol is using a 32bits random ID generated at first power up.

It's possible to generate a new ID using bind on the Hubsan protocol.

###Bind
To bind a model press the bind button, apply power and then release.

###Protocol selection

####Using the dial for PPM input
Dial|Protocol|Sub_protocol|RF Module
----|--------|------------|---------
0|Select serial||
1|FLYSKY|Flysky|A7105
2|HUBSAN|0|A7105
3|FRSKY|0|CC2500
4|HISKY|Hisky|NRF24L01
5|V2X2|0|NRF24L01
6|DSM2|DSM2|CYRF6936
7|DEVO|0|CYRF6936
8|YD717|YD717
9|KN|0|NRF24L01
10|SYMAX|SYMAX|NRF24L01
11|SLT|0|NRF24L01
12|CX10|CX10_BLUE|NRF24L01
13|CG023|CG023|NRF24L01
14|BAYANG|0|NRF24L01
15|SYMAX|SYMAX5C|NRF24L01

Notes:
- The selection must be done before the power is applied.
- The protocols and subprotocols can be personnalized by modifying the source code.

####Using serial input with er9x/ersky9x
Protocol|Sub_protocol|RF Module
--------|------------|---------
Flysky||A7105
 |Flysky
 |V9x9
 |V6x6
 |V912
Hubsan||A7105
Frsky||CC2500
Hisky||NRF24L01
 |Hisky
 |HK310
V2x2||NRF24L01
DSM2||CYRF6936
 |DSM2
 |DSMX
Devo||CYRF6936
YD717||NRF24L01
 |YD717
 |SKYWLKR
 |SYMAX2
 |XINXUN
 |NIHUI
KN||NRF24L01
SymaX||NRF24L01
 |SYMAX
 |SYMAX5C
SLT||NRF24L01
CX10||NRF24L01
 |CX10_GREEN
 |CX10_BLUE
 |DM007
CG023||NRF24L01
 |CG023
 |YD829
Bayang||NRF24L01

Note:
- The dial should be set to 0 for serial which means all protocol selection pins should be left unconnected

##Hardware

###RF modules
Up to 4 RF modules can be installed:
- [A7105](http://www.banggood.com/XL7105-D03-A7105-Modification-Module-Support-Deviation-Galee-Flysky-p-922603.html)    for Flysky, Hubsan
- [CC2500](http://www.banggood.com/CC2500-PA-LNA-Romote-Wireless-Module-CC2500-SI4432-NRF24L01-p-922595.html)   for Frsky
- [CYRF6936](http://www.ehirobo.com/walkera-wk-devo-s-mod-devo-8-or-12-to-devo-8s-or-12s-upgrade-module.html) for DSM2, DSMX, DEVO, Walkera
- [NRF24L01](http://www.banggood.com/2_4G-NRF24L01-PA-LNA-Wireless-Module-1632mm-Without-Antenna-p-922601.html) for Hisky, V2x2, CX-10, SYMAX and plenty other protocols

RF modules can be installed for protocols need only. Example: if you only need the Hubsan protocol then install only a A7105 on your board.

You also need some [antennas](http://www.banggood.com/2_4GHz-3dBi-RP-SMA-Connector-Booster-Wireless-Antenna-Modem-Router-p-979407.html) and [cables](http://www.banggood.com/10cm-PCI-UFL-IPX-to-RPSMA-Female-Jack-Pigtail-Cable-p-924933.html).

###Microcontroller
The main program is running on a ATMEGA328 running @16MHz and 3.3V.
An [Arduino pro mini](http://www.banggood.com/Wholesale-New-Ver-Pro-Mini-ATMEGA328-328p-5V-16MHz-Arduino-Compatible-Nano-Size-p-68534.html) can be used to build your Multimodule:

![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/t8214655-87-thumb-uploadfromtaptalk1405598143749.jpg?d=1441459923)

or build your own board using SMD components and an associated PCB:

![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/t7952726-108-thumb-image-62c29cf2.jpg?d=1433909893)

###Schematic
![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/a8443844-119-multiprotocol_diagram_rotary_serial_2.jpg)
Attention: All modules are 3.3V only, never power them with 5V.

###Radio integration
You can 3D print your box (detalis [here](http://www.rcgroups.com/forums/showpost.php?p=33294140&postcount=2034)):

![Screenshot](http://static.rcgroups.net/forums/attachments/1/1/5/4/3/7/t8462144-54-thumb-Multi_case_9XR.jpg?d=1448575289)
![Screenshot](http://static.rcgroups.net/forums/attachments/1/1/5/4/3/7/t8462145-106-thumb-Multi_case_v1.jpg?d=1448575293)

##Compilation

###Toolchain
Arduino 1.6.5.

###Upload the code using ISP (In System Programming)
The recommendation is to use an external programmer like [USBASP](http://www.banggood.com/USBASP-USBISP-3_3-5V-AVR-Downloader-Programmer-With-ATMEGA8-ATMEGA128-p-934425.html) to upload the code in the Atmega328. The programmer should be set to 3.3V or to not supply any voltage to the multimodule to avoid any damages.
From the Arduino environment, Skecth->Upload Using Programmer (Ctrl+Maj+U)

###Set fuses
Use a tool like [AVR Burn-O-Mat](http://avr8-burn-o-mat.aaabbb.de/) to set the fuses of the Atmega328 to:
- Low Fuse	    0xFF
- High Fuse	    0xD2
- Extended Fuse	0x05

##Troubleshooting
###LED status
- off: program not running or a protocol selected with the associated module not installed.
- slow blink: serial has been selected but no valid signal has been seen on the RX pin.
- fast blink: bind in progress.
- on: normal operation.