Small example using ultrasonic

Dependencies:   mbed

Revision:
0:bd7dd6e79e36
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Aug 11 17:36:11 2017 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/fd96258d940d
\ No newline at end of file