10 Jul
2020
10 Jul
'20
12:29 p.m.
On 2020-Jul-10, at 11:27 AM, Ian Finder via cctalk wrote:
On Fri, Jul 10, 2020 at 11:06 AM Al Kossow via cctalk
<cctalk at classiccmp.org>
wrote:
>
> Since it isn't very fancy, I wonder if you could make a new board with a
> modern Hall
> effect sensor? You just need a contact closure.
Yeah Al, that's a great suggestion. I was looking
at the AH1815 last night.
The challenge is getting the whole assembly as thin as the original, which
presents a not insignificant challenge-
Even using the SOT553 package of this:
https://cdn.sparkfun.com/assets/4/4/8/2/a/AH1815.pdf - I'd have to do some
trickery, like have it mount into a hole into the center of the board.
Reading that datasheet, it appears that to reduce power consumption those sensors employ
pulsed sleep/wake operation, presenting up to a 1/8 second delay in response time.
Probably not very good for use in a keyboard, and something to watch out for if looking
for a modern replacement sensor.