I know this should be an RTFM, but after two days of scouring, I don't have an answer. So, here it is: Can I use the 6-pin DIN on the back of my Hitec to set up an interface that would allow the computer to control the vehicle? I.e., a computer-controlled RC vehicle? Shoot me any relevant info (or just shoot me, either way).

Dick

This should be feasible: connect the audio out of PC to the Signal-IN pin of the TX trainer connector. PPM signal can then be programmed as beeps of the proper duration.

This has been discussed many times on the Radio forum. It's possible but you won't do it with an audio output. It's easy enough to drive the input of the Tx from a serial or parallel port pin.

Steve

Why wouldn't it be possible to run an audio out to an opamp or similar? I think it might be easier to code.

Dick

The signal consists of a stream of variable pulses 1-2ms long with a 4ms guard pulse, all repeated approx every 20ms. How does that map to "audio" ?

Steve

As I see it, I should be able to output pulse trains on a somewhat arbitrary frequency via the headphone jack of a computer by coding what is essentially a signal generating interpreter for my AI... or am I missing something completely? It's entirely possible, I admit.

Dick

I'm not sure I know what you mean but if you're talking about effectively using a switched AM system with an audio carrier i.e. the audio switched on and off to make the PPM signal you actually want then you'll need to use a very high frequency to get any accuracy when you decode it for the Tx. E.g at 1Khz a 1ms pulse will be only 1 cycle of your audio carrier and 2ms will be 2 cycles. That means you'd have no analog control at all just on/off. Even at 20KHz you won't have very much control. And you'll get losses in accuracy in whatever you use for your demodulator too.

But perhaps you're talking about something completely different. I know that driving a port works but your scheme might too. Why not try it ?

Steve