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If your talking a SRF04 or similar, there are a couple of issues you
need to consider. These are driven at 5VDC, and use a chunk of
current while transmitting the sensor pulse chain. On a long lead,
you may have voltage droop on the 5V line at the sensor end. The
result may be that the sensor resets, doesn'r respond correctly or
somewhere in between (read errattic behaviour - the worst). This
likely may be mitigated with a decent sized cap between VCC and
ground at the transducer/sensor. <br>
The trigger is a 10 usec pulse. On a long lead, this can become
rounded due to the capacitance of the cable, so a start pulse may
not be seen. The same goes with the recieve pulse, although since
it is longer, it is unlikely to cause any problems. <br>
If I were to try this, I would use a reasonably heavy guage cable,
say 24 AWG or better, shielding will help, but twisted won't as the
signals are single ended. If it doesn't work, tack solder a 47 uf
cap between VCC/Ground and try it. If that doesn't work, it gets a
bit more complicated....<br>
<br>
Ken<br>
<br>
<div class="moz-cite-prefix">On 2014-02-10 4:58 PM, Darcy Whyte
wrote:<br>
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cite="mid:CAGTEw4xWigbojq+RTA3URj=rkzrEdPOJsW2+vUdpgt+Ew-mM5A@mail.gmail.com"
type="cite">
<div dir="ltr">Can anybody think of a reason I shouldn't have 10'
wires on an ultrasonic range finder?
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<div>--</div>
<div>Darcy Whyte</div>
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<div>Art+ <a moz-do-not-send="true"
href="http://inventorartist.com/" target="_blank">inventorArtist.com</a> |
Aviation <a moz-do-not-send="true"
href="http://rubber-power.com/" target="_blank">rubber-power.com</a></div>
<div>Contact: <a moz-do-not-send="true"
href="mailto:darcy@inventorArtist.com"
target="_blank">darcy@inventorArtist.com</a> |
613-563-3634 by appointment (no text)</div>
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