DIY-Multiprotocol-TX-Module/README.md

# DIY-Multiprotocol-TX-Module
Multiprotocol is a 2.4GHz transmitter which enables any TX to control lot of different models available on the market.

The source code is partly based on the Deviation TX project, thanks to all the developpers for their great job on protocols.

[Forum link on RCGROUPS](http://www.rcgroups.com/forums/showthread.php?t=2165676) for additional information or requesting a new protocol integration.

![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)

**To download the latest compiled version (hex file), click on  [Release](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/releases) on the top menu.**

##Contents

[Compatible TX](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module#compatible-tx)

[Protocols](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module#protocols)

[Hardware](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module#hardware)

[Compilation and programmation](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module#compilation-and-programmation)

[Troubleshooting](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module#troubleshooting)

##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 _Config.h.

The protocol selection is done via a dip switch, rotary dip switch or scsi ID selector.

![Screenshot](http://media.digikey.com/photos/CTS%20Photos/206-4,%20206-4ST_sml.jpg)
![Screenshot](http://media.digikey.com/photos/Grayhill%20Photos/94HBB16T_sml.jpg)
![Screenshot](http://static.rcgroups.net/forums/attachments/1/1/5/4/3/7/t8637216-7-thumb-SCSI%20ID%20selector.jpg?d=1453737244)

You can access to up to 15 different protocols and associated settings.
 
Settings per selection are located in _Config.h:
 - 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.
 - Autobind: Yes or No. At the model selection (or power applied to the TX) a bind sequence will be initiated
 
###Using a serial output
The multiprotocol TX module takes full advantage of being used on a Turnigy 9X, 9XR, 9XR Pro, Taranis, 9Xtreme, AR9X, ... running [er9x or ersky9X](https://github.com/MikeBland/mbtx/tree/next). (A version for OpenTX is being looked at)

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

Notes:
 - Using this solution does not need any modification of the TX since it uses the TX module slot PPM pin for serial transfer.
 - There are 2 versions of serial protocol either 8 or 16 channels. 16 channels is the latest and only available version going forward. Make sure to use the right version based on your version of er9x/ersky9x.
 - Channels order is AETR by default but can be changed in _Config.h.

###Telemetry

There are 3 protocols supporting telemetry: Hubsan, FrSky and FrSkyX.

Hubsan displays the battery voltage and TX RSSI.

FrSky displays full telemetry (A0, A1, RX RSSI, TX RSSI and Hub).

FrSkyX displays basic telemetry (A1, A2 and RX RSSI).

### If used in PPM mode

Telemetry is available as a serial 9600 8 n 1 output on the TX pin of the Atmega328p using the FRSky hub format.

You can connect it to your TX if it is telemetry enabled or use a bluetooth adapter (HC05/HC06) along with an app on your phone/tablet ([app example](https://play.google.com/store/apps/details?id=biz.onomato.frskydash&hl=fr)) to display telemetry information and setup alerts.

### If used in Serial mode
 Telemetry is built in for er9x and ersky9x TXs.

To enable telemetry on a Turnigy 9X or 9XR you need to modify your TX following one of the Frsky mod like this [one](http://blog.oscarliang.net/turnigy-9x-advance-mod/).

Enabling telemetry on a 9XR PRO and may be other TXs does not require any hardware modifications. The additional required serial pin is already available on the TX back module pins.

Once the TX is telemetry enabled, it just needs to be configured on the model (see er9x/ersky9x documentation).

##Protocols

###TX ID
The multiprotocol TX module is using a 32bits ID generated randomly at first power up. This global ID is used by all protocols.
There are little chances to get a duplicated ID.

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

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

In Serial Mode you have 2 options:
- use the GUI, access the model protocol page and long press on Bind. This operation can be done at anytime.
- press the physical bind button, apply power and then release. It will request a bind of the first loaded model protocol.

Notes:
- the physical bind button is only effective at power up. Pressing the button later has no effects.
- a bind in progress is indicated by the LED fast blinking. Make sure to bind during this period.

###Protocol selection

####Using the dial for PPM input
PPM is only allowing access to a subset of existing protocols.
The protocols, subprotocols and all other settings can be personalized by modifying the **_Config.h** file. 

The default association dial position / protocol in every release is listed below.

Dial|Protocol|Sub_protocol|RX Num|Power|Auto Bind|Option|RF Module
----|--------|------------|------|-----|---------|------|---------
0|Select serial||||||
1|FLYSKY|Flysky|0|High|No|0|A7105
2|HUBSAN|-|0|High|No|0|A7105
3|FRSKY|-|0|High|No|-41|CC2500
4|HISKY|Hisky|0|High|No|0|NRF24L01
5|V2X2|-|0|High|No|0|NRF24L01
6|DSM2|DSM2|0|High|No|0|CYRF6936
7|DEVO|-|0|High|No|0|CYRF6936
8|YD717|YD717|0|High|No|0|NRF24L01
9|KN|WLTOYS|0|High|No|0|NRF24L01
10|SYMAX|SYMAX|0|High|No|0|NRF24L01
11|SLT|-|0|High|No|0|NRF24L01
12|CX10|BLUE|0|High|No|0|NRF24L01
13|CG023|CG023|0|High|No|0|NRF24L01
14|BAYANG|-|0|High|No|0|NRF24L01
15|SYMAX|SYMAX5C|0|High|No|0|NRF24L01

Note:
- The dial selection must be done before the power is applied.

####Using serial input with er9x/ersky9x
Serial is allowing access to all existing protocols & sub_protocols listed below.

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
 |SYMAX4
 |XINXUN
 |NIHUI
KN||NRF24L01
 |WLTOYS
 |FEILUN
SymaX||NRF24L01
 |SYMAX
 |SYMAX5C
SLT||NRF24L01
CX10||NRF24L01
 |GREEN
 |BLUE
 |DM007
 |Q282
 |JC3015_1
 |JC3015_2
 |MK33041
 |Q242
CG023||NRF24L01
 |CG023
 |YD829
 |H8_3D
Bayang||NRF24L01
FrskyX||CC2500
ESky||NRF24L01
MT99XX||NRF24L01
 |MT
 |H7
 |YZ
MJXQ||NRF24L01
 |WLH08
 |X600
 |X800
 |H26D

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

###Protocol details
Extended limits supported: -125%..+125% can be used and will be transmitted. Otherwise the default is -100%..+100% only.

Autobind protocol: you do not need to press the bind button at power up to bind, this is done automatically.

####BAYANG
Models: EAchine H8(C) mini, BayangToys X6/X7/X9, JJRC JJ850, Floureon H101 ...

Autobind protocol

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10
---|---|---|---|---|---|---|---|---|----
A|E|T|R|FLIP|RTH|PICTURE|VIDEO|HEADLESS|INVERTED

####CG023
Models: EAchine CG023/CG031/3D X4

Autobind protocol

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9
---|---|---|---|---|---|---|---|---
A|E|T|R|FLIP|LIGHT|PICTURE|VIDEO|HEADLESS

#####Sub_protocol YD829
Models: Attop YD-822/YD-829/YD-829C ...

CH5|CH6|CH7|CH8|CH9
---|---|---|---|---
FLIP||PICTURE|VIDEO|HEADLESS

#####Sub_protocol H8_3D
Models: EAchine H8 mini 3D, JJRC H20/H22

CH5|CH6|CH7|CH8|CH9
---|---|---|---|---
FLIP|LIGTH|OPT1|OPT2|CAL

JJRC H20: OPT1=Headless, OPT2=RTH

JJRC H22: OPT1=RTH, OPT2=180/360° flip mode

H8 3D: OPT1=RTH + headless, OPT2=180/360° flip mode

CAL: calibrate accelerometers

####CX10
Extended limits supported

Autobind protocol

CH1|CH2|CH3|CH4|CH5|CH6
---|---|---|---|---|---
A|E|T|R|FLIP|RATE

Rate: -100%=rate 1, 0%=rate 2, +100%=rate 3

#####Sub_protocol GREEN
Models: Cheerson CX-10 green pcb

Same channels assignement as above.

#####Sub_protocol BLUE
Models: Cheerson CX-10 blue pcb & some newer red pcb, CX-10A, CX-10C, CX11, CX12, Floureon FX10, JJRC DHD D1

CH5|CH6|CH7|CH8
---|---|---|---
FLIP|RATE|PICTURE|VIDEO

Rate: -100%=rate 1, 0%=rate 2, +100%=rate 3 or headless for CX-10A

#####Sub_protocol DM007

CH5|CH6|CH7|CH8|CH9
---|---|---|---|---
FLIP|MODE|PICTURE|VIDEO|HEADLESS

#####Sub_protocol Q282 and Q242

CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12
---|---|---|---|---|---|---|---
FLIP|LED|PICTURE|VIDEO|HEADLESS|RTH|XCAL|YCAL

Model: JXD 509 is using Q282 with CH12=Start/Stop motors

#####Sub_protocol JC3015_1

CH5|CH6|CH7|CH8
---|---|---|---
FLIP|MODE|PICTURE|VIDEO

#####Sub_protocol JC3015_2

CH5|CH6|CH7|CH8
---|---|---|---
FLIP|MODE|LED|DFLIP

#####Sub_protocol MK33041

CH5|CH6|CH7|CH8|CH9|CH10
---|---|---|---|---|---
FLIP|MODE|PICTURE|VIDEO|HEADLESS|RTH

####DEVO
Extended limits supported

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8
---|---|---|---|---|---|---|---
CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8

####DSM2
Extended limits supported

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8
---|---|---|---|---|---|---|---
A|E|T|R|CH5|CH6|CH7|CH8

####ESKY

CH1|CH2|CH3|CH4|CH5|CH6
---|---|---|---|---|---
A|E|T|R|GYRO|PITCH

####FLYSKY
Extended limits supported

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8
---|---|---|---|---|---|---|---
A|E|T|R|CH5|CH6|CH7|CH8

#####Sub_protocol V9X9
CH5|CH6|CH7|CH8
---|---|---|---
UNK|LIGHT|PICTURE|VIDEO

#####Sub_protocol V6X6
CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12
---|---|---|---|---|---|---|---
FLIP|LIGHT|PICTURE|VIDEO|HEADLESS|RTH|XCAL|YCAL

#####Sub_protocol V912
CH5|CH6
---|---
BTMBTN|TOPBTN

####FRSKY
Extended limits supported

Telemetry enabled for A0, A1, RSSI, TSSI and Hub

Option=fine frequency tuning, usually 0 or -41 based on the manufacturer boards

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8
---|---|---|---|---|---|---|---
CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8

####FRSKYX
Extended limits supported

Telemetry enabled for A1 (RxBatt), A2, RSSI

Option=fine frequency tuning, usually 0 or -41 based on the manufacturer boards

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12|CH13|CH14|CH15|CH16
---|---|---|---|---|---|---|---|---|----|----|----|----|----|----|----
CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12|CH13|CH14|CH15|CH16

####HISKY
CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8
---|---|---|---|---|---|---|---
A|E|T|R|GEAR|PITCH|GYRO|CH8

GYRO: -100%=6G, +100%=3G

#####HK310
Models: RX HK-3000, HK3100 and XY3000 (TX are HK-300, HK-310 and TL-3C)

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8
---|---|---|---|---|---|---|---
|||T|R|AUX|T_FSAFE|R_FSAFE|AUX_FSAFE

####HUBSAN
Models: Hubsan H102D, H107/L/C/D and Hubsan H107P/C+/D+

Autobind protocol

Telemetry enabled for battery voltage and TX RSSI

Option=vTX frequency (H107D) 5645 - 5900 MHz

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9
---|---|---|---|---|---|---|---|---
A|E|T|R|FLIP|LIGHT|PICTURE|VIDEO|HEADLESS

####KN
CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10|CH11
---|---|---|---|---|---|---|---|---|----|----
A|E|T|R|DR|THOLD|IDLEUP|GYRO|Ttrim|Atrim|Etrim

Dual Rate: +100%=full range, Throttle Hold: +100%=hold, Idle Up: +100%=3D, GYRO: -100%=6G, +100%=3G

#####Sub_protocol WLTOYS
#####Sub_protocol FEILUN
Same channels assignement as above.

####MJXQ
Autobind protocol

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10|CH11|CH12|CH13
---|---|---|---|---|---|---|---|---|---|---|---|---
A|E|T|R|FLIP|LED|PICTURE|VIDEO|HEADLESS|RTH|AUTOFLIP|PAN|TILT

#####Sub_protocol WLH08
#####Sub_protocol X600
#####Sub_protocol X800
#####Sub_protocol H26D

####MT99XX
Autobind protocol

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9
---|---|---|---|---|---|---|---|---
A|E|T|R|FLIP|LED|PICTURE|VIDEO|HEADLESS

#####Sub_protocol MT
Models: MT99xx
#####Sub_protocol H7
Models: Eachine H7
#####Sub_protocol YZ
Models: Yi Zhan i6S

####SLT
Autobind protocol

CH1|CH2|CH3|CH4|CH5|CH6
---|---|---|---|---|---
A|E|T|R|GEAR|PITCH

####Symax
Autobind protocol

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9
---|---|---|---|---|---|---|---|---
A|E|T|R|FLIP||PICTURE|VIDEO|HEADLESS

#####Sub_protocol SYMAX
Models: Syma X5C-1/X11/X11C/X12

#####Sub_protocol SYMAX5C
Model: Syma X5C (original) and X2

####V2X2
Models: WLToys V202/252/272, JXD 385/388, JJRC H6C, Yizhan Tarantula X6 ...

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9|CH10|CH11
---|---|---|---|---|---|---|---|---|----|----
A|E|T|R|FLIP|LIGHT|PICTURE|VIDEO|HEADLESS|MAG_CAL_X|MAG_CAL_Y

PICTURE: also automatic Missile Launcher and Hoist in one direction

VIDEO: also Sprayer, Bubbler, Missile Launcher(1), and Hoist in the other dir

####YD717
Autobind protocol

CH1|CH2|CH3|CH4|CH5|CH6|CH7|CH8|CH9
---|---|---|---|---|---|---|---|---
A|E|T|R|FLIP|LIGHT|PICTURE|VIDEO|HEADLESS

#####Sub_protocol YD717
#####Sub_protocol SKYWLKR
#####Sub_protocol SYMAX4
#####Sub_protocol XINXUN
#####Sub_protocol NIHUI
Same channels assignement as above.

##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).

###Board
The main program is running on an ATMEGA328p running @16MHz and 3.3V.
An [Arduino pro mini 16Mhz/5V](http://www.banggood.com/Wholesale-New-Ver-Pro-Mini-ATMEGA328-328p-5V-16MHz-Arduino-Compatible-Nano-Size-p-68534.html) powered at 3.3V (yes it works) can be used to build your own Multimodule.

Using stripboard:

![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/t8214655-87-thumb-uploadfromtaptalk1405598143749.jpg?d=1441459923)
![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/t8214656-102-thumb-uploadfromtaptalk1405598152484.jpg?d=1441459924)

Using a [home made PCB](http://www.rcgroups.com/forums/showpost.php?p=32645328&postcount=1621):

![Screenshot](http://static.rcgroups.net/forums/attachments/1/1/5/4/3/7/t8226720-197-thumb-IMG_20150715_230603155.jpg?d=1441816457)
![Screenshot](http://static.rcgroups.net/forums/attachments/1/1/5/4/3/7/t8226719-72-thumb-IMG_20150715_230024065.jpg?d=1441816456)

or build your own board using [SMD components](http://www.rcgroups.com/forums/showpost.php?p=31064232&postcount=1020) and an [associated PCB](https://oshpark.com/shared_projects/MaGYDg0y):

![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/t7566755-3-thumb-i.png?d=1423810885)
![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/t7952726-108-thumb-image-62c29cf2.jpg?d=1433909893)
![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)

**If you build this PCB v2.3c and want to enable serial mode for er9x/ersky9x, you have to do [this mod](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/a8667856-242-multi.jpg).**


###Schematic
![Screenshot](http://static.rcgroups.net/forums/attachments/4/0/8/5/8/3/a8443844-119-multiprotocol_diagram_rotary_serial_2.jpg)

Notes:
- Attention: All modules are 3.3V only, never power them with 5V.
- For serial, the dial switch is not needed and the bind button optionnal

###Radio integration
You can 3D print your box (details [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 and programmation

###Toolchain
Supported Arduino version is [1.6.7](https://www.arduino.cc/download_handler.php?f=/arduino-1.6.7-windows.exe). Make sure to select "Arduino Pro or Pro Mini, ATmega328 (5V,16MHz)" before compiling.

Compilation of the code posted here works. So if it doesn't for you this is a problem with your setup, please double check everything before asking.

_Config.h file can be modified to compile with/without some protocols, change protocols/sub_protocols/settings associated with dial for PPM input, different channel orders, different channels timing, Telemetry or not, ... 

###Upload the code using ISP (In System Programming)
It is recommended 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 nothing to not supply any over voltage to the multimodule and avoid any damages.

The dial must be set to 0 before flashing!

From the Arduino environment, you can use this shortcut to compile and upload to the module: Skecth->Upload Using Programmer (Ctrl+Maj+U)

To flash the latest provided hex file under [Release](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/releases), you can use a tool like [AVR Burn-O-Mat](http://avr8-burn-o-mat.aaabbb.de/), set the microcontroller to m328p and flash it.

###Upload the code using FTDI (USB serial to TTL)
Use this method only for Arduino Pro Mini boards with bootloader.

Use an external FTDI adapter like [this one](http://www.banggood.com/FT232RL-FTDI-USB-To-TTL-Serial-Converter-Adapter-Module-For-Arduino-p-917226.html).

The programmer should be set to 3.3V or nothing to not supply any over voltage to the multimodule and avoid any damages.

From the Arduino environment, you can use Upload button which will compile and upload to the module: Skecth->Upload (Ctrl+U)

To upload the latest provided hex file under [Release](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/releases), you can use a tool like [XLoader](http://russemotto.com/xloader/), set the microcontroller to Atmega328 and upload it.

###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 (or 0xFD which is the same)

This will make sure your ATMEGA328 is well configured and the global TX ID is not erased at each updates.

##Troubleshooting

###LED status
- off: program not running or a protocol selected with the associated module not installed.
- flash: invalid protocol selected (excluded from compilation or invalid protocol number)
- 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.

###Protocol selection
####Input Mode - PPM
- The protocol/mode selection must be done before the power is applied.
- Connect 1 to 4 of the selection protocol pins to GND.

####Input Mode - Serial
- Make sure you have done the mods to the v2.3c PCB by adding the 2.2k and 330 ohm resistors as indicated in the [Board section] (https://github.com/pascallanger/DIY-Multiprotocol-TX-Module#board).
- Leave all 4 selection pins unconnected.

###Bind
Make sure to follow this procedure: press the bind button, apply power and then release it after 1sec. The LED should be blinking fast indicating a bind status and then fixed on when the bind period is over. It's normal that the LED turns off when you press the bind button, this behavior is not controlled by the Atmega328.
For serial, the preffered method is to bind via the GUI protocol page.

It migth happen that your module is always binding at power up. If this is the case, there is a big chance that you are using an Arduino Pro Mini with an external status LED. To work around this issue connect a 10K resistor between D13 and 3.3V.

###Report issues
You can report your problem using the [GitHub issue](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/issues) system or go to the [Main thread on RCGROUPS](http://www.rcgroups.com/forums/showthread.php?t=2165676) to ask your question.
Please provide the following information:
- Multiprotocol code version
- TX type
- Using PPM or Serial, if using er9x or ersky9x the version in use
- Different led status (multimodule and model)
- Explanation of the behavior and reproduction steps