I am building a micromouse-type robot, and I am using sonar distance
detection. I have constructed the sonar circuit out of the BASIC Stamp
manual, and I have connected it to a PIC16C63/JW at 20MHz, and I am using
one of the CCP modules in capture mode to time the echos. I am having
trouble with spurious (some might say random) readings, and being both new
to using PICs, and to audio-type electronics, I am having trouble
ascertaining what is the cause. When previously connected to a Stamp, the
circuit appeared to work, but since it was intended for use with the PIC, it
was not fully tested on the stamp. If anyone on the list has experience of
this or any similar situation, I would greatly appreciate it if they could
give me any help. Circuit / PCB diagrams and source code are availiable if
they will help to show what I am doing wrong.

--
Ian Caulfield - Mailto:ic@obsnd.demon.co.uk
Website (under construction) - http://www.obsnd.demon.co.uk/ian
"Travelling thru' cyberspace ain't like dustin' crops, boy"