I2c search scanner and list possible devices. Recommend to use TeraTerm VT as the serial monitor due to some formatting code in the printf's.

Dependencies:   mbed

Revision:
0:70d3ee543c70
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Feb 21 08:57:05 2020 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400
\ No newline at end of file