Interfacing Arduino and Radio Controlled Transmitter

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Want to know how to interface an Arduino with a Radio Control Transmitter? Read on to see how. Signals from the Arduino can be sent to the transmitter as a result of this interface. The arduino signal is mixed with the manual input and the resulting signal is received by the radio-controlled model.

The main idea behind this is to have a video camera fitted with a couple of servers with head motion tracking providing the input.

Another use of this circuit is PC-to-RC interface, with the arduino being utilized as a USB-to-RC bridge. The processing can be done at one end with the model receiving the final commands at the other end. A data transmitter can also be used in this scenario, but for now that is out of scope.

The first step involved is in making a trainer cable. This cable is used by the RC transmitter to connect the radio transmitter to the reciever. Once this is done, a small connector has to be made using headers, perfboard and shrinkwrap. This connector is to be fitted at the arduino end of the connecting cable.

The next thing required is the PPM frame generation. This involves generation of a series of pulses that ranges to about a 20ms frame. The pulses generated are the same as servo control pulses.

The arduino plays the role of recording accurate time of the transmitted pulses. Thus the 20ms frame can be used to do more than just this activity. A couple of other activities can be performed and this would involve programming a few interrupts. The interfacing is done and system is now ready for transmission.

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