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rajendran
03-22-2009, 11:28 PM
Hi,

We bought the below ultrasonic transmitters/receivers
http://www.hobbyengineering.com/H1324.html

I have a basic doubt about the pins.

The transmitter has 2 pins. The place one pin connects to the sensor has a bulge so as to differentiate the two pins. Now what is the functionality of the pins, I don't know. I assume one is for GROUND, one is for +VE. Is this correct. Also what does the bulged pin represent ?

Also we don't know how to interface the ultrasonic transmitter/receivers to micro controller board. Especially how to convert the 5V pulse generated by microcontroller to 20V pulse to be fed to the transmitter ?
Do we use a amplifier/op-amp circuit to amplify the 5V pulse to 20V ?

Anybody know about and used ultrasonic transmitter/receivers, please clarify our doubts.

Thanks

allbits
03-23-2009, 02:58 PM
you cannot directly interface the TX or RX modules. You need to drive the TX by a switch or something, and use an amp/filter combination to receive it. There is a more detailed post about this posted some time back. browse back the forums, its all there.

allbits
03-23-2009, 03:03 PM
ah, here it is, fished out for you..

http://www.roboticsindia.com/modules.php?name=Forums&file=viewtopic&t=1929&highlight=

http://www.roboticsindia.com/modules.php?name=Forums&file=viewtopic&t=2006&postdays=0&postorder=asc&highlight=ultrasonics&start=0