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Old Dec 06, 2012, 05:47 AM
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Pi Complete

The object of the game was to make a box that could be set up anywhere & fly the vehicle with 1 button press & no GUI. That's mostly possible, except for the 1 issue of calibrating the compass. A user interface of some kind was necessary, but could also be done with aural cues.

Playing uncompressed sound files on a pi with 2 webcams is done thus:

amixer -D hw:2 sset 'PCM' 65535
aplay -D hw:2 test.wav

The webcams take up the 1st 2 devices.

Next, you need to restore the last of a pair of 28 year old, amplified speakers, in which the other one stopped working, but you threw out the electronics not knowing it merely required an easily obtained LA4461 audio chip.

As a standalone box, it takes 80% of the CPU during flight. The maximum stable frequency remanes 900Mhz. Active cooling made no difference at 1Ghz & isn't necessary at 900Mhz. What does need active cooling is the voltage regulator. The total power with the cooling fan, servos, cameras, & CPU is 1.5A at 12V. It still takes quite a bit of power to do machine vision.

With a network GUI enabled, it goes to 90% of the CPU. A system with at least a tablet interface is a lot more useful. Unfortunately, while an access point based on the rtl8192cu was possible in Linux 3.2.9 for Ubunt, it no longer is in 3.2.27 for the pi.

It now can't change the interface to master mode. A different dongle may be required, simply because the software no longer works.

Some things that got it farther along:


modprobe hostap
modprobe cfg80211
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