In Reply to: ultrasonic distance meter circuit posted by Khaled NAJA on 03/11/02 at 4:17 PM:
For circuits I found:
http://www.geocities.com/robobix/US.html
http://www.xilinx.com/xapp/xapp364.pdf
Simple:
http://www.ichinoseki.ac.jp/~satok/SATOK/ptc/ulm.html
Best??:
http://www.mindspring.com/~sholmes/robotics/hwfrm.htm
Commercial:
http://www.senix.com/
http://www2.ncsu.edu/ncsu/pams/physics/PCEP/www/PCC/spring95/sensorne.html
http://www.omniinstruments.co.uk/level/vgson50.pdf
http://www.siemens-milltronics.com/pdf/brochure/7ML1033Brochure.pdf
http://www.warnernet.com/PDF/UltrasonicSensors.pdf
Educational project (you might have to email the authors):
http://www.sensorsmag.com/articles/1000/55/main.shtml
http://www.concord.org/slic/ccsr-doc.html