<div dir="ltr"><div>I see a lot of them listed for sale, but I don't see the specs on
them anywhere other than the data item that the helicopter battery is a
3.7v 150mAh battery, so they are probably 3v max power. I would
recommend waiting until they arrive and then test them to determine the
current for them under load so you have decent specs for the H-bridge.<br><br></div>But I do agree it should not take too much to control them.<br><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Jan 16, 2014 at 6:11 PM, Charles West <span dir="ltr"><<a href="mailto:crwest@ncsu.edu" target="_blank">crwest@ncsu.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div>Hey Rodney,<br></div><div><br>I'm hoping to use eight of these:<br><a href="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=111154620711" target="_blank">cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=111154620711</a><br>
<br></div>
I'm not quite sure of the specs yet, because I haven't gotten the data
sheet yet. However, the motors only weight 3 grams each (and I don't
think we will be running them at full power), so I don't think the
amperage will be that high. Its for the Astropresence drone and we'll
probably be trying to run it in a neutral buoyancy tank.<br>
<br></div>Just one to start with, but we are hoping to present the
project at the SpaceVision conference (and pitch the idea again to a few
people). If there is interest in the project, we'll probably be
iterating the design several times.<br>
<div class="gmail_extra"><br></div><div class="gmail_extra">Thanks,<br>Charlie<br></div><div><div class="h5"><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Jan 16, 2014 at 5:27 PM, Rodney Radford <span dir="ltr"><<a href="mailto:ncgadgetry@gmail.com" target="_blank">ncgadgetry@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><div>What are the specs of the motors you plan to drive - voltage and current - as that will partially limit the choices.<br>
<br></div>Also do you have any preferences on form factor for the IC - through hole, SMT, etc?<br>
<br></div>And how many do you plan to build - just one, or are you planning to make several?<br></div><div class="gmail_extra"><br><br><div class="gmail_quote"><div><div>On Thu, Jan 16, 2014 at 5:25 PM, Charles West <span dir="ltr"><<a href="mailto:crwest@ncsu.edu" target="_blank">crwest@ncsu.edu</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div><div dir="ltr"><div><div>Hello,<br><br></div>I'm
working on a project where I need to get bi-directional control on 8
small dc motors. In the past I've just made H-bridges from discrete
Darlington transistors, but I think that that would be too bulky for
this project. However, I'm not quite sure what chips would be best to
use.<br>
<br>These (and similar) chips seem popular:<br><a href="https://www.sparkfun.com/products/315" target="_blank">https://www.sparkfun.com/products/315</a><br><br></div><div>If I may ask, is that what you use or is there some other chip that you prefer?<br>
<br></div><div>Thanks,<br></div><div>Charlie West<span><font color="#888888"><br></font></span></div></div></div></div><span><font color="#888888">
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