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 <[email protected]> > 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.
