added serial up, down, left and right control

Dependencies:   mbed

Fork of Robot_a_cables_v3_6 by Alexandre Benard

Revision:
0:1ab5fdb4fa56
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Feb 09 20:49:17 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/7130f322cb7e
\ No newline at end of file