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Date: Fri, 30 Mar 2012 07:56:02 +1100
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Subject: Re: [geda-user] Reed Switch vs Hall Sensor
From: Stephen Ecob <stephen DOT ecob AT sioi DOT com DOT au>
To: geda-user AT delorie DOT com
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On Fri, Mar 30, 2012 at 7:28 AM, Rob Butts <r DOT butts2 AT gmail DOT com> wrote:
> I have been told hall switches are more reliable but they are all active
> low.

MTBF reliable or false alarm reliable ?

Considering the low current you're putting through the reed switch I
expect it will last a long time.  How reliably it detects the pouch
being opened depends on the reed switch, the magnet and how they're
physically located.

I'd use a small, strong rare earth magnet to ensure the switch doesn't
false trigger.

For really low power, why not wire the power supply for the entire
circuit through the reed switch so that power is only consumed when
the pouch is opened ?

Stephen