In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bernoulli wrote:

The use of a Hall-Effect sensor would work well with your design.  There are different types available and these links may help you to review some of them:
[url]http://www.allegromicro.com/en/Products/Categories/Sensors/index.asp[/url]
[url]http://www.allegromicro.com/en/Products/Design/Tech_Pubs.asp#B[/url]

I am enclosing a PDF file which Allegro MicroSystems published and is freely available on the internet.  These sensors cost around $1.50 or less and can be found on sites like [url]http://www.Mouser.com[/url] and [url]http://www.Digikey.com[/url].

The link for the attached PDF is: [url]http://www.allegromicro.com/en/Products/Design/an/an27701.pdf[/url]

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