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Drone Collision — Add HC-SR04 ultrasonic sensors with an EZ-B to AR Parrot Drone v1/v2 for collision detection and avoidance Try it →

Algeraist

Australia

Asked May 2012 — Edited May 2012

Cheap Distance Sensor - Free Shipping

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https://www.dealextreme.com/p/hc-sr04-ultrasonic-sensor-distance-measuring-module-133696

DX is a good site but always takes a while to ship - I'd allow 3-4 weeks in Australia at that is...not sure about US times

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Canada

#1 May 2012

Even cheaper on E-Bay.

I recently bought (6) for 2.50/ea.

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