Read DigitalIn and send UART message using UART 3

Dependencies:   mbed

Revision:
0:09cb1c9e1957
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Mar 28 03:45:45 2019 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/04dd9b1680ae
\ No newline at end of file