Magnet to set off unipolar hall sensor

[jwoody (Jeremy)]

Hi everybody
As part of a Arduino rotator project I am working on I have a hall effect sensor and was wondering how big a magnet is needed for it?
Here is the sensor
https://www.digikey.com/product-deta...1001-ND/374779

Something like this?
https://www.ebay.com.au/itm/4mm-x-1-...HvkqhufnreewxQ

I have no idea!!!
Thank you
Jeremy

[trent_julie]

Hi Jeremy,
A tiny fridge magnet can set them off in close proximity (almost touching)

Trent

[mswhin63 (Malcolm)]

There is some information in the datasheet that can be easily research.

operating point typically is 90 Gauss, so a magnet like this one will suffice between 5 and 10mm.

Unfortunately you cant get this information from eBay, especially any from China. But in general small one should work well.

To get the Gauss reading - https://www.supermagnete.de/eng/faq/...x-gauss-magnet

[jwoody (Jeremy)]

Thanks very much Trent and Malcolm

[trent_julie]

Ps look for the center of the detection rather than the first activation, it is a bit more repeatable that way.

[jwoody (Jeremy)]

Originally Posted by trent_julie

Ps look for the center of the detection rather than the first activation, it is a bit more repeatable that way.

Thank you