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SRF04 Schematic ( PDF Datasheet ) - Parallax

Teilenummer SRF04
Beschreibung Ultrasonic Range Finger Application Note
Hersteller Parallax
Logo Parallax Logo 




Gesamt 5 Seiten
SRF04 Datasheet, Funktion
599 Menlo Drive, Suite 100
Rocklin, California 95765, USA
Office: (916) 624-8333
Fax: (916) 624-8003
Web Site: www.parallax.com
Educational: www.stampsinclass.com
Devantech SRF04 Ultrasonic Range Finder
(#28015)
The Devantech SRF04 ultrasonic range finder provides precise, non-contact distance measurements from
about 3 cm (1.2 inches) to 3 meters (3.3 yards). It is very easy to connect to BASIC Stamps or the
Javelin, requiring only two I/O pins.1 The SRF04 library makes this device very simple to use and is an
ideal component for robotics applications.
The SRF04 works by transmitting an ultrasonic (well above human hearing range) pulse and measuring
the time it takes to "hear" the pulse echo. Output from the SRF04 is in the form of a variable-width pulse
that corresponds to the distance to the target.
The SRF04 is designed and manufactured by Devantech, who provides additional technical resources for
the device. Their web site is http://www.robot-electronics.co.uk.
Features
Voltage – 5 v
Current – 30 mA Typ. 50mA Max.
Frequency – 40 kHz
Max Range - 3 m
Min Range - 3 cm
Sensitivity - Detect 3 cm diameter broom handle at > 2 m
w Input Trigger – 10 uS Min. TTL level pulse
Echo Pulse - Positive TTL level signal, width proportional to range.
w Small Size – (1.7 in x .8 in x .7 in height) 43 mm x 20 mm x 17 mm height
w.DataSheet4U1 For a Javelin Stamp application note see www.javelinstamp.com.
.comParallax, Inc. • Devantech SRF04 Ultrasonic Range Finder (#28015) • 10/2003
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