I've been wearing the watch constantly for two weeks already and it has been working great. Thanks to the slider switch that I added the battery life has been extended even more.
The only thing that I want to improve with this build is how it looks. The case is too bulky and, i admit, not that good looking that my wife is always unsure whenever I try to wear it in public. This of course, defeats the purpose of my design. So the next obvious step is to go smaller. And this can be done by using SMD components.
I've already designed a circuit in Eagle which has been a fun experience.
The only thing keeping me from continuing with this is delivery costs of the printed PCB and the parts. I can go with the cheapest delivery options but I'm afraid it'll get lost in transit, or worse, in our country's customs.
Another option that I'm leaning towards right now is to re-layout the circuit and making it more compact as possible. For me to know what new layout I should aim for, I bought a watch band that looks better looking but also has limited space.
Here are some not-so-well-thought-out ideas that might help make this possible:
- Don't use an IC socket as it is too bulky. This would mean I'd have to solder the ATTiny85 directly, which I'm fine with as I am pretty happy with the program and have no need to change it.
- Consider removing the R1 resistor connecting to the transistor. I've had tests before where it still worked without it. I just need to make sure it won't fry anything.
- Solder the legs directly of the diode directly to the components. It'll save board space and would allow us to move it to someplace else where there is free space.
- Use thinner and more flexible wires so I can stuff them inside without worrying about them.
- Use a smaller battery than the CR2032. It'll mean less capacity but I can hook up 2-3 small ones in parallel to extend it.
It's a long shot but I think it's doable. I'll think about this some more and will post an update when I'm ready.
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