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# DIY-Multiprotocol-TX-Module
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# DIY-Multiprotocol-TX-Module
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DIY Multiprotocol TX Module
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Multiprotocol is a TX module which enables any TX to control lot of different models available on the market.
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[Main Thread on RCGROUPS](http://www.rcgroups.com/forums/showthread.php?t=2165676)
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##Compatible TX
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###Using standard PPM output (trainer port)
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The multiprotocol TX module can be used on any TX with a trainer port.
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The protocol selection is done via a dip switch or a rotary dip switch for access to up to 15 different protocols. The selection must be done before the power is applied.
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To bind a model press the bind button, apply power and then release.
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###Using a serial output
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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)
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This enables full integration using the radio GUI to setup models with all the available protocols options.
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Options are:
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- Protocol and type: many main protocols have variants
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- RX Num: number your different RXs and make sure only one model will react to the commands
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- Power: High or low, enables to lower the power setting of your TX (indoor for example).
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- Option: -127..+127 allowing to set specific protocol options. Like for Hubsan to set the video frequency.
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- Bind: bind a RX/model
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- Autobind: Yes or No. At the model selection (or power applied to the TX) a bind sequence will be initiated
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- Range: test range by setting the transmission power to the lowest value
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##Hardware
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###RF modules
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Up to 4 RF modules can be installed:
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- [A7105](http://www.banggood.com/XL7105-D03-A7105-Modification-Module-Support-Deviation-Galee-Flysky-p-922603.html) for Flysky, Hubsan
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- [CC2500](http://www.banggood.com/CC2500-PA-LNA-Romote-Wireless-Module-CC2500-SI4432-NRF24L01-p-922595.html) for Frsky
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- [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
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- [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
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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.
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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).
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###Microcontroller
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The main program is running on a ATMEGA328 running @16MHz and 3.3V.
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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:
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or build your own board using SMD components and an associated PCB:
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###Schematic
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###Radio integration
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You can 3D print your box (detalis [here](http://www.rcgroups.com/forums/showpost.php?p=33294140&postcount=2034)):
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