Hello all fellow "Serial Sonar" enthusiasts,

I have succeeded in making an ultrasonic rangefinder which interfaces
serially (4 wire, incl. gnd) with a PC over the PC's parallel port (so no
level conversion was needed). It has an effective range of about 10 feet,
uses 20 parts, and has a useful resolution of about 1.1 centimeters,
minimum useable range of about 5 cm. I am continuing to try to improve the
range among other things, but since it seems to be working reliably up to
this point, I have posted the schematic, PIC16C84 source code, and PC
source code as well as EXEs for it to my web page
http://www.people.cornell.edu/pages/shb7/ranger.html

I am interested in hearing how well anyone succeeds in building/improving
my design, as well as any new ideas on this thread in general. I am also
willing to provide any assistance that I can to others either trying to use
my schematic/code or just trying to build rangers. My email is
mailto:shb7@cornell.edu

Good luck,

Sean




+--------------------------------+
| Sean Breheny                   |
| Amateur Radio Callsign: KA3YXM |
| Electrical Engineering Student |
+--------------------------------+
http://www.people.cornell.edu/pages/shb7
Web Page Under Construction!
mailto:shb7@cornell.edu