Test the speed of sensor module PID controlled speed. When note is passed the optical sensors data is collected and shared via SWO

Dependencies:   mbed PID SWO

Revision:
0:fc81857d8067
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Nov 30 10:22:36 2018 +0000
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+http://mbed.org/users/mbed_official/code/mbed/builds/e95d10626187
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