**To download the latest compiled version (hex file), click on [Release](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/releases) on the top menu.**
The multiprotocol TX module takes full advantage of being used on a Turnigy 9X, 9XR, 9XR Pro, Taranis, 9Xtreme, AR9X, ... running [er9x](http://openrcforums.com/forum/viewtopic.php?f=5&t=4598) or [ersky9X](http://openrcforums.com/forum/viewtopic.php?f=7&t=4676). An OpenTX version for Taranis is available [here](http://plaisthos.de/opentx/).
- 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 is available as a serial 9600 8 n 1 output on the TX pin of the Atmega328p using the FRSky hub format for Hubsan, FrSky, FrSkyX and DSM format for DSM2/X.
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.
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.
- [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).
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. An Arduino Mini based on Atmega328p can also be used.
####Build your own board using [SMD components](http://www.rcgroups.com/forums/showpost.php?p=31064232&postcount=1020) and an [associated PCB v2.3c](https://oshpark.com/shared_projects/MaGYDg0y):
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).
Repository includes Kicad files of schematic and pcb. This is a variant of the Multipro V2.3c circuit design. It is basicly the same as the 2.3c board as far as component placement goes. What's changed is the added resistors for the serial protocol and also
This module can be purchased [here](http://www.banggood.com/2_4G-CC2500-A7105-Flysky-Frsky-Devo-DSM2-Multiprotocol-TX-Module-With-Antenna-p-1048377.html). All the 4 RF modules are already implemented A7105, NRF24L01, CC2500 and CYRF6936. The board is also equiped with an antenna switcher which means only one antenna for all.
**It is highly recommended to update the firmware** of this board as it is distributed with a really old and bugged one. For this you have to solder a 6 pin header (top left) and use an USBASP like explained [below](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module#upload-the-code-using-isp-in-system-programming).
Note: if you have the 1st board revision (check pictures above), sometime bind occures at power up even without pressing the bind button or not having an autobind protocol. To solve this issue, replacing the BIND led resistor (on the board back) of 1.2K by a 4.7K.
Download the [zip file](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/archive/master.zip) of this repository, unzip it in a folder, navigate to the Multiprotocol directory and then click on Multiprotocol.ino. The Arduino environment will appear and the Multiprotocol project will be loaded.
[_Config.h file](https://github.com/pascallanger/DIY-Multiprotocol-TX-Module/blob/master/Multiprotocol/_Config.h) must be modified to select which protocols will be available, change protocols/sub_protocols/settings associated with dial for PPM input, different TX channel orders and timing, Telemetry or not, ...
Notes:
- 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.
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.
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.
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.
- Make sure you have done the mods to the v2.3c PCB by adding the 2.2k and 470 ohm resistors as indicated in the [Board section] (https://github.com/pascallanger/DIY-Multiprotocol-TX-Module#board).
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.
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.
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
