With the information found in this project you can modify a HobbyKing HK310 or a Turnigy X-3S transmitter to send arbitrary information on the three channels to the receiver. This allows for example to:
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Change the AUX channel from a two positin switch to a three position switch
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Change the AUX channel to an analog channel
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Perform custom mixing on any of the channels
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Transmit arbitrary data over the AUX channel to a custom decoder as to expand the system to a large number of on/off channels, e.g. to control lights and accessories on a scale RC truck
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Build your own custom transmitter by just reusing the wireless module
Sample programs for the Arduino pro mini are provided.
Start by reading hk310-info.md, which describes how the HK310 works and how we can modify it.
The ./logs directory contains dumps of the serial communication within the
HK310, which was used to decode and understand the system.
The document expansion-protocol.md proposes a way of how to add 16 on/off channels to the system.
The ./firmware directory contains source code for various sample programs,
such as changing the AUX channel to a three position switch or an analog
channel. Code is available for Arduino as well as for Microchip PIC.
./transmitter-eeprom-contents and ./receiver-eeprom-contents contain dumps
of the EEPROM that is connected to the NRF module and in the receiver
respectively, which contains the unique binding data.
Several Python programs are available that are useful to work directly on a PC without having to use a microcontroller.