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 Ultrasonic Distance Detecting kis for UNO/Duemilano/Mega Experiment US $26.99 
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Sensing distance between two moving objects?
I want to make something that can sense the distance between two moving objects. I have been trying to look at ultrasonic sensors, but as far as I know (and I don't know that much about this stuff) the waves just bounce off anything in the way.
What I really want is for a main sensor on the first object to connect to a secondary one on the second object, so that the sensor on the first object can tell the distance between them. It would be ideal for it to connect to a picaxe or atmel chip (and just output the data in terms of centimeters [preferably] to the chip).
So does anyone know what sort of sensors i can use and where to get them from?
I want to use this outside so i think that Infrared is out of the question. However, i can settle with doing this inside, if its easier, so IR is not entirely out of the question.
Thanks
About the only way I can think of is to use a "marco polo" effect. In other words, have one device send an ultrasonic pulse out. The second device sends an active echo but sending out it's own ultrasonic pulse. If you have a known delay between the received pulse and the transmission of the reply, you can subtract that time and get the distance between the 2 devices. You can even experiment with coded signals on the ultrasonic pulses to increase the accuracy. Something like this could even tell you if the objects were getting farther away from each other, remaining the same distance, or getting closer together.