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Jul 08, 2007, 09:39 PM
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2 way wireless


So the replacement MAX3389 had no effect on the PDA. With the new MAX3389 it couldn't even receieve data. Options are to buy a commercial serial port for it ($40) or get a more portable laptop ($600).

Moving forward with the old laptop, finally got 2 way wireless working. Phase shift keying, 4 bit flow control, CRC checking, and transmitter power cycling are all working.

The ground station first enters 2 way mode when the user enters an i. To flush the serial buffers, it takes a bunch of i's. Vicacopter is programmed not to enter 2 way mode unless the throttle is off and once in 2 way mode, to fix throttle at 0. Need 2 test that. Vicacopter sends a private code to exit 2 way mode. The user must exit 2 way mode before the throttle is reenabled and transmitter cycling is disabled.

Cycling the 72Mhz transmitter every 1/2 second to defeat interference works. It's super slow but usable. Only 1 packet can travel in a single cycle. The algorithm could be improved to combine multiple packets in a single cycle, but this may be replaced by a proper 2.4Ghz modem.

Have the video of 2 way wireless working for the first time.

2 way wireless (1 min 6 sec)


Vicacopter's menu system of course, is another phase.
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