I have currently tried to connect a ultrasonic sensor hcsr04 to my BBB with 
no success. 
The support material I was using is to establish the connection and execute 
a trigger to my sensor and read the output is: 
https://github.com/luigif/hcsr04.
When I`m executing the ./hcsr04 file I receive accordingly the being msg: >> 
Initializing PR >> Executing HCSR-04 code, which after it seems to wait for 
the signal to be triggered but never receives one.

Could you give me some advises? or if you experience working with this 
model of sensor and have some tips? 

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