basic pca9685

Fork of ic2_test_bus by Martin Simpson

Revision:
1:dbe78e80d722
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Mon Oct 29 14:56:07 2018 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#ed7fe215002a9c50452acfecda633ce47e00c614