Ultra sonic transducer circuit help!!

Other Hardware Sensors
1

Hi everyone

For a while ? am tring to interface the arduino and the the ultrasonic transducer
but ? can not find any proper circuit to interface them.
Do you have any experiance with such a working circuit?

2

http://www.junun.org/MarkIII/datasheets/SRF04.pdf
This uses a PIC, but it should be simple to substitute an AVR

3

FeNeSTronY:
Hi everyone

For a while ? am tring to interface the arduino and the the ultrasonic transducer
but ? can not find any proper circuit to interface them.
Do you have any experiance with such a working circuit?

Are you talking about an ultrasonic distance sensor (like AWOL is proposing) - or a bare transducer set(ie, a bare ultrasonic transmit/receive transducer pair - like the parts used on such an ultrasonic distance sensor)?

4

ı have this pair

5

AlphaZeta made a nice circuit: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1295749011
As your sensors use 40 kHz you will have to adjust it somewhat I think, especially the receiver band-pass filter (his use 24kHz). Also, it doesn't say "transducer" on the sensors you got, so I don't know if you can use them to transmit the pulses also. But I suppose you can (it says SPL - Sound Pressure Level?, as well as sensitivity on the specs).
Personally I have just barely tested a couple of transducers similar to AlphaZeta's (but 40kHz - I think, its a while ago), and I could swap which was what with no apparent loss of functionality.

6

I found this cct at A Cheap Ultrasonic Range Finder

Picked up the 330uH inductor today, so haven't tested it yet.

There is some discussion regarding the Alphazeta reference and the zero point in the bridge, and it's affect on the transducer, in the comments at the bottom.

Mark
I've also ordered one of terrys ones http://arduino-direct.com/sunshop/index.php?l=product_detail&p=115, so it will be interesting to see how it goes.