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43oh

Another 430 Watch


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Schematic is here:

http://voodoomanmiracle.com/wp/?p=59

I will try to add more info there.

 

It's basically the same as your OLED booster pack.  This made it really easy to test code on the LP + Terminal without changing anything for the watch.  There is also a place for a current sense resistor to monitor current while running off the battery.

 

I want to add an accelerometer in the next version.  I'm currently looking for a good part for that, and open to suggestions.  I want to use that to replace some button functions.  For example, tapping twice on the screen to show time, or twisting your wrist.

 

I'll try to share some boards with you guys on the next round.  Current version is a little bodged.  I put some vias too close to the flex ribbon pads, etc.

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Need the Z axis to make the tap thing work.  Could probably find a use for the others, but not necessary.  I want it to be able to trigger an interrupt to wake the micro.  Don't want to keep polling it.  Programmable threshold on that would be nice.  And low power is big priority.

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I got the display from gabotronics.  I also got some blue ones from a shady chinese company, but they don't seem to work for this.  There really isn't much of a case.  I filled between the display and pcb with epoxy.  Glued on the tips of some servo horns for watch band lugs.  Made a back plate from some sculpey.  It's actually holding up pretty well, but I'll probably get something better done on a rapid prototype machine at some point.

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I got the display from gabotronics.  I also got some blue ones from a shady chinese company, but they don't seem to work for this.  There really isn't much of a case.  I filled between the display and pcb with epoxy.  Glued on the tips of some servo horns for watch band lugs.  Made a back plate from some sculpey.  It's actually holding up pretty well, but I'll probably get something better done on a rapid prototype machine at some point.

Lars' watch might provide you with some inspiration.

2011-06-30 13.40.25.jpg

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low power accelerometers are very expensive.  You could rig-up a piezo shock detector, though, for the sort of feature you're chasing.

You're right about price.  I don't really mind, though, as I don't plan to mass produce or anything.

I think the piezo would require a lot more design considerations.  It would also be larger.

With the accelerometer, all the fine tuning can be done in software.

 

I also had the idea to use it to log sleep patterns.  Graphs could be shown right on the display in the morning.  

 

edit:  I may be wrong about the piezo.  Do you think the flexible film type could be adhered to the back of the display and function as described.  It wont flex much behind the layers of glass.

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