hall effect help

[CellarDoor]

I am wondering if a hall effect sensor would be better than a reed switch. I have considered this but have not found any online schematics to be helpfull. Basically all I would need is something to run off of 12V dc, and drive an R/C circuit to convert the pulse to a triangle waveform. I am not familiar with how a hall effect chip is supposed to be hooked up in a simple circuit. thanks.

 

[itsmoked]

CellarDoor: Hall effect switches are often a pain in the rear. I would usually use something else, if at all possible. Anyway, you can use an optical switch? They are much more straight forward to use. And cheaper too!

You can stick a black patch on the rotating member and detect it going by. Or put a little platic flag on the rotating member and let it interrupt an integrated optical switch. Every laser printer or copy machine has a zillion of these in it.

 

[buzzp]

I guess more info is needed. Are you monitoring a rotating piece of equipment? If so, hall effects are easy to work with with this (secure a magnet on the rotating part). Or an inductive or capacitive proximity switch will work as well. These are sensitive enough to detect peaks and valleys of sprockets and such. Don't know if one or the other is cheaper.

 

[felixc]

The are hall-effect sensors that come with temperature compensation and signal conditioning electronics.
Isn't an ABS sensor a Hall effect switch? I guess so, the tip is magnetized and it detects iron. This can make for a cheap and solid sensor.
Digikey sells a lot of different hall-effect sensors and elements.