[CART360] Magnetic Sensor

[Vincent Leclerc]

Also:
http://www.amazingmagnets.com/
http://www.wondermagnet.com/

On Mon, Oct 19, 2009 at 9:51 PM, Craig Fahner <craig.fahner at gmail.com>wrote:

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

Creative | Technical Director, ESKI Inc.
1751 Richardson, Suite 4311
Montreal, QC, Canada, H3K 1G6
http://eskistudio.com/
http://maps.google.com/maps?q=eski+montreal

Part-time Faculty, Design and Computation Arts
Concordia University, Montreal, QC, Canada
http://hybrid.concordia.ca/~cart360_vincent/

office: 514-510-5777 #221
fax: 514-510-5888
cell: 514-293-9358
http://vincentleclerc.com

* 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.
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