The speed of the sound in the dry air (20° C) is around 343 m/s. Send a short ultrasonic pulse at Frequency of 40Khz in the air, and try to listen to the echo. Of course you won’t hear anything (only a little click noise), but with an ultrasonic sensor the back pulse can be detected. If you know the time of the forth & back travel of the ultrasonic wave, you know the distance, divide the distance by two and you know the range from the ultrasonic sensor to the first obstacle in front of it.
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Archives for October 2012
Roundcube remove server field
Roundcube is web based open source multiuser IMAP client, yesterday I upgraded my older installation to a new stable version 0.8.2.
After successfully installation I was able to see a new redesigned login window with stupid server field. [Read more…]