Greg,
I use an accelerometer to activate the display when it's at a 45 degree angle,
which angle is set by the user when setting the time. It works great. There are
a pair of time setting buttons on the right side. They will have tiny O-rings. I
will also have a big O-ring around the case, between the front and rear halves.
The watchmaking industry sells these O-rings in ~0.5mm cross section.
I have been using an old Casio calculator watch as a reference, to see how Japan
solved these design problems decades ago.
I'll post renderings of the case as I do the redesign. I hope to have this
project wrapped up this summer - it's been languishing for over 2 years!
On 6/15/2015 1:38 PM, gregebert wrote:
What about the mechanism to turn-on the display ? Is it a water-resistant
pushbutton, or something else ?
My original plan was to use skin resistance across 2 metal contacts to
turn-on. The problem I encountered was that when the watch energized it
created excessive noise, so the technique was flaky. It worked nicely on my
prototype (how many times has that happened before......)
I ended up using a pushbutton, so mine definitely is not water-resistant.
And due to another flub, I'm unable to recharge the battery because one of
the charging terminals has an electrical open. Either I smash the case
open, or drill a small hole to contact the battery terminals. But I do get
to find out how long it runs on 1 charge...My prototype has been running
more than 3 months on it's initial charge.
I decided against wireless charging because I was afraid of induced voltage
in the PCB traces, and even the components, as well as not having enough
room for a Li-ion battery-charge controller.
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