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<div class="moz-cite-prefix">This is where we could benefit from the
experience of the robotics club guys (TAR - Triangle Area
Robotics).<br>
<br>
You will want to power the teensy on its own, not through the
power pins on a R-Pi.<br>
<br>
Circuit Cellar Magazine last August & September published a
Raspberry-Pi I/O board that is far superior to the Gert Board and
its like, but its shares one basic element:<br>
<br>
They have their own power connector, and regulate that with a
switching 5V regulator and a separate 3.3V regulator. That latter
they connect to pin-1 of the GPIO connector to power the R-Pi -
the USB power is never involved.<br>
<br>
If you are not using the 5V supply for anything beyond the motors,
consider this 6V regulator instead
(<a class="moz-txt-link-freetext" href="https://www.commonsenserc.com/product_info.php?products_id=51">https://www.commonsenserc.com/product_info.php?products_id=51</a>)
-- that'll get you more torque out of your motors, and constant
voltage regardless of the battery level.<br>
<br>
On 01/20/2014 12:14 AM, Charles West wrote:<br>
</div>
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cite="mid:CAGojqS=iHWjXhAxPBz8ZwgP5NH7==QTXcCeO9xWrUsn9D7MeNg@mail.gmail.com"
type="cite">
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<div>
<div>Hello,<br>
<br>
</div>
I'm building a mobile robot from an RC tank. I'm hoping
to have a Raspberry Pi with a Webcam, Wifi dongle and
speakers for the top layer, connected via USB to a Teensy
3.0 board (3.3 volts), which will be doing PWM with 2
H-bridges to control the motors and feeding back data from
3 HC-SR04 ultrasonic sensors (5 volts).<br>
<br>
</div>
<div>The motors/batteries are suppose to be at 6 volts. I
think I could boost that to as high as 9 volts without
problems (though it will oscillate as the motors are
used).<br>
</div>
<div><br>
</div>
The Teensy can be powered from USB from the Raspberry Pi and
will just be switching transistors (so the current draw
shouldn't be much). It looks like most everything else
besides the motors will be running at 5 volts. I could just
use a linear regulator, but with the Raspberry Pi and
accessories I think the wasted power could be substantial.<br>
<br>
</div>
<div>I could use a switching regulator, but the ones I've seen
so far seem to need a lot of external components (this is
mostly on breadboard at this point). Do you guys tend to
use complete PCBs (like this one: <a moz-do-not-send="true"
href="http://www.ebay.com/itm/171193232080">http://www.ebay.com/itm/171193232080</a>)?<br>
</div>
<div><br>
</div>
This is my first battery operated project, so I don't really
know the common solution here. If I may ask, what would you
advise?<br>
<br>
</div>
Thanks,<br>
Charlie West<br>
</div>
<br>
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<pre wrap="">_______________________________________________
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</pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="80">--
Scott G. Hall
Raleigh, NC, USA
<a class="moz-txt-link-abbreviated" href="mailto:ScottGHall1@GMail.Com">ScottGHall1@GMail.Com</a>
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