Posted on Feb 5, 2014

This circuit interfaces a standard RC-control to a standard PC game port, see figure 1. The main target was to use the interface for the FMS flight simulator. The interface makes it possible to use a standard RC radio to control the FMS flight simulator under Microsoft Windows 2000 and XP. Of course, it also works under Win95, ME, 98. As long as y

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ou have a working game port (joystick port) on your PC you can use this interface. The system was developed and tested with a Hitec Flash-5X (35M) Digital Proportional Radio Control system, see figure 2. However, it should work without any modification with most RC controllers. The RC Transmitter (controller) sends a PWM (Pulse Width Modulated) signal to the receiver. The PWM signal is also sometimes called PPM (Pulse Position Modulation). The receiver decodes the signal and uses the signal to control servos etc of the model in use. The PWM signal is illustrated in figure 3. As can be seen by the figure a frame is built up of a number of channels, in this case four channels. The frames a repeated with about 50 frames a second. The circle in figure 3 focus on channel one in the frame. In figure 4 you find an enlarge picture of just that cannel. As you see in figure 4 the channel time is divided by two parts. TLow  is always the same length and is about 0. 5 mille seconds. THigh  on the other hand is variable between 0. 5 and 1. 5 mille seconds. The Thigh  time depends on the position of the stick on the RC-control (transmitter). As you can see the timing changes from 0. 5 to 1. 5 mille seconds. By measuring the THigh  time for each channel in the frame, we have a measurement of the position of the sticks. This is exactly what the electronics in RCPIS does. It does this by a help of a microprocessor. For a full...

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