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Devantech SF04 Ranger Sonar Sensors         · Range - 3cm to 3m         · Emits 8 cycle sonic bursts traveling .9 ft/sec         · Sonic bursts rebound off of objects and            return to sensors and are calculated to           determine time and distance

Parallax Basic Stamp II      · BSX (Scenix SX28AC Microcontroller)      · 50Mhz Processor Speed      · Executes ~10,000 instructions/sec      · 32 bytes of RAM      · Programmed with PBASIC

Block Diagram shows how sonar sensor (top left) is operated.

Section of Microcontroller Code:
main
    gosub sr_sonar
    debug wdist
    pause 200
end

sr_sonar:
    pulsout init,5
    pulsin echo, 1, echotime
    wDist = echotime/convfac
    pause 10
return