Devantech SRF04 Ranger
last modified 2011-12-13
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Part Number:R93-SRF04
Price:$29.50 (USD)

This ultrasonic ranger has an approximate range of 3 cm to 3 m. This ranger has a logic line used to trigger a pulse and the echo is returned on a second line. Minimal power requirements and a compact, self contained design make this a versatile range finder.

Manufactured By - Devantech Ltd (Robot Electronics)

There are a couple of requirements for the input trigger and output pulse generated by the ranger.  The input line should be held low (logic 0) and then brought high for a minimum of 10 µS.  The pulse is generated on the falling edge of the input trigger. The ranger's receive circuitry is held in a short blanking interval of 100 µS to avoid noise from the initial ping and then it is enabled to listen for the echo.  The echo line is low until the receive circuitry is enabled.  Once the receive circuitry is enabled, the falling edge of the echo line signals either an echo detection or the timeoute (if no object echo is detected).

Specifications
Voltage5 V
Current30 mA typcially 50 mA maximum
Frequency40 kHz
Min Range3 cm (1.18 in)
Max Range3 m (9.84 ft)
Input Trigger10 µS minimum, TTL level pulse
Echo PulsePositive TTL level signal, proportional to range
Weight11.33 gm (0.4 oz)
SensitivityDetect a 3 cm (1.18 in) diameter stick at > 2 m (6.56 ft)
Connection TypeDigital
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