SRF05 ultrasonic sensor

Ultrasonic module can be used to identify obstructions, 1 cm -4 meters. Can be easily connected to the micro-controller, such as BASICX.
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VEX Robotics parts ship from Texas

US Schools/School Districts can order by Purchase Order

The latest model SRF05. Detection range of 3 cm from the original SRF04 -3 m, increased to 1 cm -4 meters. RF04 is compatible with the original. Also has smaller side lobes.

The ultrasound module would be applied to the robot module. Your robot will be able to detect surroundings with bat-like sonar, requiring only a small piece of code. With accurate distance control your of the motor, your robot can easily avoid obstacles.

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Data Sheets

Working voltage - 5v .
Operating Current - 30mA Typical. 50mA maximum.
Operating Frequency - 40KHz.
Maximum detection range - 4 m.
Minimum detection range - 1 cm.
Sensitivity - Detect 3cm diameter broom handle at> 2 m.
Input Trigger - 10uS Min. TTL level pulse.
Echo Pulse - Positive TTL level signal, width proportional to range.
Size - 43mm x 20mm x 17mm high.