Also:<br><a href="http://www.amazingmagnets.com/">http://www.amazingmagnets.com/</a><br><a href="http://www.wondermagnet.com/">http://www.wondermagnet.com/</a><br><br><div class="gmail_quote">On Mon, Oct 19, 2009 at 9:51 PM, Craig Fahner <span dir="ltr"><<a href="mailto:craig.fahner@gmail.com">craig.fahner@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Lee Valley has really good Rare Earth magnets that I've used with Hall<br>
Effect sensors. The Ottawa store ships to Montreal.<br>
<br>
<a href="http://www.leevalley.com/hardware/page.aspx?c=2&p=42348&cat=3,42363" target="_blank">http://www.leevalley.com/hardware/page.aspx?c=2&p=42348&cat=3,42363</a><br>
<br>
c<br>
<div><div></div><div class="h5"><br>
On Mon, Oct 19, 2009 at 9:27 PM, Vincent Leclerc<br>
<<a href="mailto:vincentlecler@gmail.com">vincentlecler@gmail.com</a>> wrote:<br>
> This is the hall effect sensor I showed in class:<br>
> <a href="http://www.allegromicro.com/en/Products/Part_Numbers/3213/3213.pdf" target="_blank">http://www.allegromicro.com/en/Products/Part_Numbers/3213/3213.pdf</a><br>
><br>
> They are omnipolar, which means they can be triggered by either a north or<br>
> south magnetic field.<br>
> Digikey sells them for $1.76.<br>
> <a href="http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=620-1043-ND" target="_blank">http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=620-1043-ND</a><br>
><br>
> For HB LEDs, go to <a href="http://ledz.com/?p=led.power" target="_blank">http://ledz.com/?p=led.power</a><br>
> They have 3W (3.5V, 700mA) LEDs that will blind you. They might have a<br>
> minimum order qtt so you may want to try eBay for the same type of product.<br>
> <a href="http://business.shop.ebay.ca/Business-Industrial-/12576/i.html?_nkw=3w+led&_catref=1&_fln=1&_sac=1&_trksid=p3286.c0.m282" target="_blank">http://business.shop.ebay.ca/Business-Industrial-/12576/i.html?_nkw=3w+led&_catref=1&_fln=1&_sac=1&_trksid=p3286.c0.m282</a><br>
><br>
> DON'T FORGET to heatsink these LEDs. They emit a lot of heat and it needs to<br>
> be properly dissipated with an aluminum heatsink. If you don't, they will<br>
> last only several hours.<br>
><br>
> You drive them with a mosfet and use a current limiting resistor like a<br>
> normal LED with the formula V=RI.<br>
><br>
> In that case at 5V:<br>
><br>
> 5 - 3.5 = R * 0.7<br>
> 1.5 = R * 0.7<br>
> R = 2.1 Ohms<br>
><br>
> You will need a special power resistor, because so much current will go<br>
> through it. With the formula P = VI we get:<br>
><br>
> P = 1.5 * 0.7<br>
> P = 1.05 Watt<br>
><br>
> So to be safe, you need a 3 Ohm, 2 Watt resistor like so:<br>
> <a href="http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=3.0W-2-ND" target="_blank">http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=3.0W-2-ND</a><br>
><br>
><br>
> Vincent<br>
><br>
><br>
><br>
> On Mon, Oct 19, 2009 at 5:20 PM, Alec Mathewson <<a href="mailto:alec.mathewson@gmail.com">alec.mathewson@gmail.com</a>><br>
> wrote:<br>
>><br>
>> Hey Vincent<br>
>><br>
>> I want to buy a couple Magnetic sensors and strong LED's I can strobe.<br>
>> Anything particular I need to consider regarding the ones you had posted?<br>
>><br>
>> Alec<br>
>><br>
><br>
><br>
><br>
> --<br>
> Vincent Leclerc<br>
><br>
> Creative | Technical Director, ESKI Inc.<br>
> 1751 Richardson, Suite 4311<br>
> Montreal, QC, Canada, H3K 1G6<br>
> <a href="http://eskistudio.com/" target="_blank">http://eskistudio.com/</a><br>
> <a href="http://maps.google.com/maps?q=eski+montreal" target="_blank">http://maps.google.com/maps?q=eski+montreal</a><br>
><br>
> Part-time Faculty, Design and Computation Arts<br>
> Concordia University, Montreal, QC, Canada<br>
> <a href="http://hybrid.concordia.ca/%7Ecart360_vincent/" target="_blank">http://hybrid.concordia.ca/~cart360_vincent/</a><br>
><br>
> office: 514-510-5777 #221<br>
> fax: 514-510-5888<br>
> cell: 514-293-9358<br>
> <a href="http://vincentleclerc.com" target="_blank">http://vincentleclerc.com</a><br>
><br>
> * The information contained in this e-mail and all attachments is<br>
> confidential and is for the sole use of its intended recipient. It may not<br>
> be disclosed to or used by anyone other than the addressee. If received in<br>
> error, please contact the sender by return e-mail and delete this e-mail and<br>
> all attachments from your system.<br>
><br>
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</blockquote></div><br><br clear="all"><br>-- <br>Vincent Leclerc<br><br>Creative | Technical Director, ESKI Inc.<br>1751 Richardson, Suite 4311<br>Montreal, QC, Canada, H3K 1G6<br><a href="http://eskistudio.com/">http://eskistudio.com/</a><br>
<a href="http://maps.google.com/maps?q=eski+montreal">http://maps.google.com/maps?q=eski+montreal</a><br><br>Part-time Faculty, Design and Computation Arts<br>Concordia University, Montreal, QC, Canada<br><a href="http://hybrid.concordia.ca/~cart360_vincent/">http://hybrid.concordia.ca/~cart360_vincent/</a><br>
<br>office: 514-510-5777 #221<br>fax: 514-510-5888<br>cell: 514-293-9358<br><a href="http://vincentleclerc.com">http://vincentleclerc.com</a><br><br>* The information contained in this e-mail and all attachments is confidential and is for the sole use of its intended recipient. It may not be disclosed to or used by anyone other than the addressee. If received in error, please contact the sender by return e-mail and delete this e-mail and all attachments from your system.<br>