Let's Make Robots!

workin of ultrasonic sensor

can any1 pls xplain d working of ULTRASONIC SENSOR?

or working of anyother environment independent sensors? 

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that should have all you need

Yearh! :D
if you are good with a soldering iron, I'd suggest this handy little sensor thats cheap and good at obstacle avoidance,,,
could you suggest me a good environment independent sensors...and explain its working pls
ya my main purpose is  obstacle avoidance...so suggest me  cheap sensor and also its working

Please write adult-english!

And please be more specific, what is it that you would like to know precisely?