Understand the way to use HC-SRF04 on STM32 (Nucleo board)

Dependencies:   SRF05 mbed

Revision:
0:99c5f79155a6
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Jan 02 00:00:18 2018 +0000
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+https://os.mbed.com/users/mbed_official/code/mbed/builds/7130f322cb7e
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