<div dir="ltr"><span style="font-family:arial,sans-serif;font-size:13px">Hi all,</span><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">I am a graduate student in computer engineering at NCSU ,specializing in chip design and embedded systems.I have attended last meeting on custom pcb design conducted by Triembed group at NC state.I found the seminar very informative and interesting .I would like to know if somebody could present a seminar on RTOS in embedded systems in future.</div>
<div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">Regards,</div><div style="font-family:arial,sans-serif;font-size:13px">Sai Saketh</div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:13px">
<br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Jan 17, 2014 at 1:04 AM, Jon Wolfe <span dir="ltr"><<a href="mailto:jonjwolfe@yahoo.com" target="_blank">jonjwolfe@yahoo.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-size:10pt;font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif">Pololu.com has some really nice h-bridge and stepper driver breakout boards. They're more than breakouts, a lot of them have all the needed support components and current limit pots. <br>
<br><br><div><span><br></span></div><div><br></div> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:10pt"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12pt">
<div dir="ltr"> <hr size="1"> <font face="Arial"> <b><span style="font-weight:bold">From:</span></b> Rodney Radford <<a href="mailto:ncgadgetry@gmail.com" target="_blank">ncgadgetry@gmail.com</a>><br> <b><span style="font-weight:bold">To:</span></b> Charles West <<a href="mailto:crwest@ncsu.edu" target="_blank">crwest@ncsu.edu</a>> <br>
<b><span style="font-weight:bold">Cc:</span></b> TriEmbed
<<a href="mailto:triembed@triembed.org" target="_blank">triembed@triembed.org</a>> <br> <b><span style="font-weight:bold">Sent:</span></b> Thursday, January 16, 2014 6:31 PM<br> <b><span style="font-weight:bold">Subject:</span></b> Re: [TriEmbed] [OBSOLETE trianglearduino:1093] Favorite H-Bridge chip<br>
</font> </div><div><div class="h5"> <div><br><div><div><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 clear="none"><br clear="none"></div>But I do agree it should not take too much to control them.<br clear="none"><div><br clear="none"><br clear="none">
<div>On Thu, Jan 16, 2014 at 6:11 PM, Charles West <span dir="ltr"><<a rel="nofollow" shape="rect" href="mailto:crwest@ncsu.edu" target="_blank">crwest@ncsu.edu</a>></span> wrote:<br clear="none">
<blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div dir="ltr"><div><div>Hey Rodney,<br clear="none"></div><div><br clear="none">I'm hoping to use eight of these:<br clear="none">
<a rel="nofollow" shape="rect" href="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=111154620711" target="_blank">cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=111154620711</a><br clear="none">
<br clear="none"></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 clear="none">
<br clear="none"></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 clear="none">
<div><br clear="none"></div><div>Thanks,<br clear="none">Charlie<br clear="none"></div><div><div><div><br clear="none"><br clear="none"><div>On Thu, Jan 16, 2014 at 5:27 PM, Rodney Radford <span dir="ltr"><<a rel="nofollow" shape="rect" href="mailto:ncgadgetry@gmail.com" target="_blank">ncgadgetry@gmail.com</a>></span> wrote:<br clear="none">
<blockquote 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 clear="none">
<br clear="none"></div>Also do you have any preferences on form factor for the IC - through hole, SMT, etc?<br clear="none">
<br clear="none"></div>And how many do you plan to build - just one, or are you planning to make several?<br clear="none"></div><div><br clear="none"><br clear="none"><div><div><div>On Thu, Jan 16, 2014 at 5:25 PM, Charles West <span dir="ltr"><<a rel="nofollow" shape="rect" href="mailto:crwest@ncsu.edu" target="_blank">crwest@ncsu.edu</a>></span> wrote:<br clear="none">
</div></div><blockquote 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 clear="none"><br clear="none"></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 clear="none">
<br clear="none">These (and similar) chips seem popular:<br clear="none"><a rel="nofollow" shape="rect" href="https://www.sparkfun.com/products/315" target="_blank">https://www.sparkfun.com/products/315</a><br clear="none">
<br clear="none"></div><div>If I may ask, is that what you use or is there some other chip that you prefer?<br clear="none">
<br clear="none"></div><div>Thanks,<br clear="none"></div><div>Charlie West<span><font color="#888888"><br clear="none"></font></span></div></div></div></div><span><font color="#888888">
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