Read status of buttons on D5-D7 of PCF8574. Turn on corresponding led D0-D3.

Dependencies:   PCF8574 mbed

Revision:
0:c862449fe089
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon Apr 04 20:59:46 2016 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/c0f6e94411f5
\ No newline at end of file