Electronics > Projects, Designs, and Technical Stuff
Powering a LED watch
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alank2:
Thanks Mariush - I was looking at many of those rectangular batteries last night and I agree that they might be better suited.
netdudeuk:

--- Quote from: alank2 on January 16, 2019, 08:03:57 pm ---

Some of these are power hungry, but some are quite bright with little current.  This model is very nice at only 5mA.

--- End quote ---

I like that. Who sells it ?
alank2:
Digikey, Mouser, others:

There are a ton of them in various sizes, 4 char, 8 char, even a 2 row 16 char (it is just two 8 chars mounted to each other).

The best ones are:

hcms-2905
hcms-2915
hcms-2925
hcms-2965
hcms-2976

Don't let the 3.3V ones dissuade you, they still can handle 5V and are even brighter than the 5V versions.

hcms-3906
hcms-3966
hcms-3916
hcms-3976
hcms-3907
hcms-3967
hcms-3917
hcms-3977

There are a lot more, but these are the best in terms of brightness vs. current used.  They have a ton of traditional orange, yellow, green, and red models that consume much more current for the same level of brightness.

FWIW, the smaller 3.7mm makes smoother looking characters in my opinion, but the larger 4.6mm are bigger though the pixels stand out more.
vk6zgo:

--- Quote from: Audioguru on January 16, 2019, 04:30:43 am ---My father-in-law had an LED watch 40 years ago. Every time he looked it was not showing anything. Useless. Why do you want to make such an old thing?

--- End quote ---
Was it the type where you were supposed to push a button to make it display, like the one I had?
After a while, the switch for that button would fail.

Mine didn't get a chance to fail, though.
I lost it while I was laying pavers, so I think it finished its life with a big slab of concrete sitting on top of it!
Kilrah:

--- Quote from: Audioguru on January 16, 2019, 04:30:43 am ---My father-in-law had an LED watch 40 years ago. Every time he looked it was not showing anything. Useless. Why do you want to make such an old thing?

--- End quote ---
You can have an accelerometer turn it on for you nowadays. And rechargeable batteries mean it's a lot less of a problem if it's empty in a week... heck that's a lot compared to most smartwatches of today.
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