| 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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