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Sounds like a pretty elegant solution.<br>
<br>
ken<br>
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<div class="moz-cite-prefix">On 2014-02-11 1:24 PM, Adam Hill wrote:<br>
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cite="mid:CAAoQ5Qrmf+NE2QaLkBYfzhG5ic_mE=z4FA5rpiApxF6FA0-RqA@mail.gmail.com"
type="cite">
<div dir="ltr">I can confirm Ken's suspicions, at least
anecdotally. I was not able to do a lot of debugging at the
time, but when I tried using long leads with a similar sensor it
was completely unreliable. Instead of fighting with physics, my
solution was to go wireless. I created an adhoc network with an
airport express and connected a beagle bone to the network which
was close to the proximity sensor. That gave me the effective
range of the wifi network while keeping the sensor components
close to the data collection hardware.
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<div>Best of luck,</div>
<div>-ah</div>
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<div class="gmail_quote">On Mon, Feb 10, 2014 at 7:44 PM, Ken
McKinnon <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:klmckinnon@rogers.com" target="_blank">klmckinnon@rogers.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
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<div text="#000000" bgcolor="#FFFFFF"> 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
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<div class="h5"><br>
<br>
<div>On 2014-02-10 4:58 PM, Darcy Whyte wrote:<br>
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<div class="h5">
<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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