From: James Cameron <quozl@laptop.org>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Sun, 2 Aug 2020 15:25:46 -0700
Subject: Re: [EE] "Tactile" spec?
Thread-Topic: [EE] "Tactile" spec?
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On Sat, Aug 01, 2020 at 12:38:06PM -0400, speff@interlog.com wrote:
> The two "Operation force" numbers in the Hon Yuan datasheet imply
> hysteresis (one maximum force to actuate and one minimum force to
> release) so tactile feel but but whether that means it makes a noise
> is not obvious (how would you even specify that technically?).

In manufacturing test, a force sensing movable probe with a microphone
can generate two time domain graphs.  (We used one of these at
our CM for OLPC, in button endurance testing).

You can then see from the graphs if there is a tactile and noise
response.

However, I've almost never seen them added to datasheets.  Making a
promise of compliance would be costly, as the manufacturer would have
to extend input QA to the springs and mechanical engineering.

If it was for human rated space, aviation, railways, or medical
devices, perhaps.

I reckon it would be done for emergency stop buttons if the
regulations for those were created today.

--=20
James Cameron
http://quozl.netrek.org/
--=20
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