Ultrasonic sensor used HC-SR04

Dependencies:   mbed

Revision:
0:6947b0547f9f
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sun Jan 18 13:42:41 2015 +0000
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+http://mbed.org/users/mbed_official/code/mbed/builds/4fc01daae5a5
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