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Amphibionics 07 3/24/03 9:13 AM Page 308
Amphibionics
PROGRAM 7.4
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Testing the SRF04 Ultrasonic Ranger

As described previously, the ranger works by emitting a short burst
of sound and then listening for the echo. Under the control of the
PICmicro MCU 16F84, the SRF04 will emit an ultrasonic (40 kHz)
sound pulse. The pulse travels through the air, hits an object, and

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