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41499Published On Feb 02,2010 12:39 PMshare9
Simply use IR distance & Ultrasonic to detect the bi-directional in & out.

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JackRose
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Projects7
Components
Grove - 80cm Infrared Proximity Sensor
$13.90 Add To Cart
Grove - Base Shield
$8.90 Add To Cart
Grove - Ultrasonic Ranger
$14.90 Add To Cart
Grove - 4-Digit Display
$5.90 Add To Cart
8mm RGB Led lamp common anode (10 PCs)
$8.50 Add To Cart
Seeeduino Cloud - Arduino Yun compatible openWRT controller
$49.95 Add To Cart
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