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This thread is privately moderated by Jack Crossfire, who may elect to delete unwanted replies.
Aug 21, 2008, 02:36 AM
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The Gumstix pulverizer

Well, another few hours of reboots, flexing & playing, & the problem moved to 1 of the SDRAM chips. Looks like Gumstick #2 is dead. Also another PIC lost an analog pin.

Unfortunately, we're out of money for August. Now some options for September:

Draconian downgrade to a netburner or something & just get the job done with a software rewrite.

$100 Downgrade to the cheapest 200Mhz Gumstick & just get the job done with existing software.

$130 - $170 Replace with another 400Mhz to 600Mhz Gumstick & commit to a bigger neural computing campaign + a heavy case.

$195 Upgrade to a 500Mhz Blackfin & commit to a bigger neural computing campaign + a software rewrite.

All a main computer needs is 3 serial ports & not many clockcycles. The Blackfin has neither hardware floating point nor A/D, so it's a miss. The Netburner would need some hardware magic to make flight recordings & we all know what happened to the SD card campaign.

Nothing has happened with neural networks because it's unlikely such a small aircraft can get more stable. The way the pros do it is by developing a plant neural network & a controller neural network. The plant learns to predict results of control inputs & the controller uses the plant to train itself. They can't just flip the inputs & the outputs to make a controller out of a predictor.

We would have 2 networks for an attitude controller & 2 networks for a velocity controller. The networks themselves R black boxes, redesigned to suit the latest whim. The plant & controller are where the programming is & fixed components.
Last edited by Jack Crossfire; Aug 21, 2008 at 03:00 AM.
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Aug 21, 2008, 06:24 AM
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Since you have nothing to lose with that Gumstix board, this sounds like a great opportunity to try solder reflow in a toaster oven.
Aug 21, 2008, 11:31 AM
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I'm flying my Trex with a 66Mhz Mod5282 NetBurner.
This includes reading RC signals from a normal RC receiver, generating 8 RC servo signals communicating with an IMU, GPS and Maxtream telemetry radio over three serial ports and managing to log everything to an SD card.

If you want more speed the MOD5234 should run at twice the speed.
(You will need an external A/D the MOD5282 has one built in.)

Aug 21, 2008, 11:45 AM
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Hers an app note on adding a Micros SD card to the back of a NetBurner...

The libraries already support FAT32 SD/micro SD card flash file system.


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