Small example using ultrasonic

Dependencies:   mbed

Revision:
0:bd7dd6e79e36
Child:
1:8fafe8a483e9
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Adafruit_GFX.lib	Fri Aug 11 17:36:11 2017 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/nkhorman/code/Adafruit_GFX/#7fb1d4d3525d