Another 430 Watch

[VMM 36]

Hello.  I figured I would share a project I've been working on since I borrowed a lot of code from this forum.  It's a small watch using a g2553 and the same OLED display as "The Terminal".  Thanks bluehash for the breakout, RobG and gwdeveloper for code, and others.  

[spirilis 1,264]

Slick!!

[bluehash 1,578]

Super!.. could you give us some more information? I'd love to build this.

[VMM 36]

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.

[bluehash 1,578]

Thanks!

 

Make sure you upload a small video. How many axes do you need on the accelerometer?

[VMM 36]

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.

[rockets4kids 204]

Nice!

 

Do you have any better pictures?

 

Did the case come from an existing watch, or did you fabricate that as well?

[izdane 6]

That thing looks awesome!

 

Where did you get the OLED for the watch? 

[VMM 36]

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.

[bluehash 1,578]

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.

[VMM 36]

Yeah.  Something like that.  Case design might actually be kinda tough.  The buttons are the hard part.  I'd also like to keep it as small as possible.  Will need to brush up on my 3d modeling.

[jpnorair 340]

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

[xpg 127]

That's really neat!

[VMM 36]

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.

[mogorman 0]

How long where you driving the watch with the display on?  and what kind of mA are you drawing awake vs in sleep?