stm32f3discovery hc-sr 04 not work

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DrAzzy
Sounds like it's not seeing any response from the HC-SR04.
```
setWatch(function(e){console.log(e);},A1,{repeat:true}); //replace A1 with echo/output pin
digitalPulse(A0,1,0.01);  //Replace A0 with the trigger (input) pin
```
If that displays nothing, it confirms that the part isn't behaving as expected.

Do you have it connected to 5v tolerant pins, and 5v power? From what I see on the web, the HC-SR04 requires 5 volts.

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