I got a couple of these from Aaron. I’ll get busy with them as soon as I return from Toronto.
Might be the same as I already have at: http://mambohead.com/2011/07/ultrasonic-module-hc-sr04-distance-sensor/
Also Aaron found some software for them:
Just spotted this Arduino library release today :
(Saw it on the Dangerous Prototypes blog at http://dangerousprototypes.com/2011/10/17/hc-sr04-ultrasonic-arduino-library/)
It directly supports these ultrasonic sensors on the arduino platform, so that should give you a nice head start on making use of them.
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