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Author Topic: reading an ultrasonic sensor  (Read 910 times)
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I'm building my own ultrasonic ranger so I don't have to pay the ridiculous prices for devices like Ping))). So far I got the transmitting part working (it produces 40khz I checked on a scope). The receiving part is giving me some trouble, I don't understand analog very well circuits so bear with me, I used a basic mic pre-amp circuit (here:http://schematics.circuitdiagram.net/images/viu1261279341a.jpg) with an ultrasonic transducer and tried reading it with my arduino analog pins and it doesn't seem to react to the ultrasonic noises. Does anybody have any idea how I can listen for ultrasonic frequencies using my transducer (040k2)? If I can somehow amplify my signal with an hbridge then that would be great cuz i'm already using half of a quad h-bridge ic (sn754410) for my transmitter.
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Refer the linkhttp://www.kerrywong.com/2011/01/22/a-sensitive-diy-ultrasonic-range-sensor/,
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if by ridiculous price, you mean $29.99

http://www.parallax.com/Store/Sensors/ObjectDetection/tabid/176/ProductID/92/List/1/Default.aspx?SortField=ProductName,ProductName

how about $2.26
http://www.ebay.com/itm/1pcs-Ultrasonic-Module-HC-SR04-Distance-Measuring-Transducer-Sensor-for-Arduino-/261009210866?pt=LH_DefaultDomain_0&hash=item3cc55c7df2

or way less if you are not in a hurry and bid on auctions.
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