hi,
I want to use hall effect on bike wheel but not sure how to use it. Is a 10k resistor between 5+ and output all that is needed ? (pins 1 and 3)

will it toggle to ground/zero while connected to 5+ ?

this blurb was on the site which has the sensor:
Posted by Marcwolf on 15th Jun 2010

Bit of an application note for the unwary

Looking from the front where the writing is
Pins run from left to right 1,2,3

Pin 1 is +5v (or +3.3v)
Pin 2 is Gnd
Pin 3 is Output

Put a 10K resistor between pins 1 & 3. The output will then toggle between High and Low with the magnet. Upi can feed that directly onto a digital pin of a PicAxe or Arduino }}

http://www.sparkfun.com/datasheets/Components/General/Hall-US1881EUA.pdf

 

That would be the one I'd use first.

 

do you mean a resistor between Vdd and Grnd ? what value for a 5 volt circuit and a 10k bnetween vdd and output.

thanks.

 

I see two resistors. What are you looking at that has just one resistor?

 

According to the data sheet for 5 volts it was 3.6 mA min.? I think. <snip> now that I've closed the pdf and blinked a few times, I can't remember.



Use the value in data sheet, a calculator and the formula.