<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.<div>
<br></div><div>Best of luck,</div><div>-ah</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Feb 10, 2014 at 7:44 PM, Ken McKinnon <span dir="ltr"><<a href="mailto:klmckinnon@rogers.com" target="_blank">klmckinnon@rogers.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<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<div><div class="h5"><br>
<br>
<div>On 2014-02-10 4:58 PM, Darcy Whyte
wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">
<div dir="ltr">Can anybody think of a reason I shouldn't have 10'
wires on an ultrasonic range finder?
<div><br>
</div>
<div><br clear="all">
<div>
<div dir="ltr"><br>
<div>
<div><br>
</div>
<div>
<div>--</div>
<div>Darcy Whyte</div>
<div><br>
</div>
<div>Art+ <a href="http://inventorartist.com/" target="_blank">inventorArtist.com</a> |
Aviation <a href="http://rubber-power.com/" target="_blank">rubber-power.com</a></div>
<div>Contact: <a href="mailto:darcy@inventorArtist.com" target="_blank">darcy@inventorArtist.com</a> |
<a href="tel:613-563-3634" value="+16135633634" target="_blank">613-563-3634</a> by appointment (no text)</div>
</div>
</div>
<div><br>
</div>
</div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
<br>
</div></div><pre>_______________________________________________
Lab mailing list
1. subscribe <a href="http://artengine.ca/mailman/listinfo/lab" target="_blank">http://artengine.ca/mailman/listinfo/lab</a>
2. then email <a href="mailto:Lab@artengine.ca" target="_blank">Lab@artengine.ca</a> to send your message to the list</pre>
</blockquote>
<br>
</div>
<br>_______________________________________________<br>
Lab mailing list<br>
1. subscribe <a href="http://artengine.ca/mailman/listinfo/lab" target="_blank">http://artengine.ca/mailman/listinfo/lab</a><br>
2. then email <a href="mailto:Lab@artengine.ca">Lab@artengine.ca</a> to send your message to the list<br></blockquote></div><br></div>