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This thread is privately moderated by Jack Crossfire, who may elect to delete unwanted replies.
Jun 26, 2007, 01:54 AM
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Copter -> great beyond -> portable serial terminal


Good news: we can send data from Vicacopter to a graphing calculator on the ground, with wireless flow control, CRC checking, and reset detection. Data to the ground moves at 3900bps including error checking. It could move at 7800bps but is underclocked to support the impedance matching circuit on the 2.4Ghz receiver.

Bad news: can't get data out of the calculator. The HP48GII needs some obscure usage of the flow control pins to send data. If it did send data, the bitrate would be 640bps because it uses the 75Mhz transmitter and is piggybacked on the flight control data.

We can invest a lot of money in RS232 debuggers to try to get the
HP48GII to send data, invest a lot of money on a laptop with unlimited battery power, or invest a lot of money on a PDA with RS232, but at this point there's no need for a 2.4Ghz Maxtream. The 2 way wireless protocol works for the most part. All the work to integrate it with the flight controls is done.
Last edited by Jack Crossfire; Jun 26, 2007 at 03:15 AM.
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