[Weather] conversion help

[Herbert E. Plett]

--- Chris <chrislk73 at yahoo.com> wrote:
...
> Reed relays are binary devices - they are either open or closed and thus
> make a convenient input into a digital system.  (In my experience they
> also have the states "contacts bouncing" and "broken" ;-))
> 
> Hall Effect devices have an analogue output, unless you get one that has
> integrated electronics to deliver a digital output.  (The ones employed
> in automotive electronic ignition systems may have this - I'm not sure.)
...

don't forget that reeds don't use power, but halls do -> parasitic not enough!



 
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