VMM 36 Posted March 17, 2013 Share Posted March 17, 2013 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. xpg, CorB, izdane and 14 others 17 Quote Link to post Share on other sites
spirilis 1,264 Posted March 17, 2013 Share Posted March 17, 2013 Slick!! Quote Link to post Share on other sites
bluehash 1,581 Posted March 17, 2013 Share Posted March 17, 2013 Super!.. could you give us some more information? I'd love to build this. Quote Link to post Share on other sites
VMM 36 Posted March 17, 2013 Author Share Posted March 17, 2013 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 Quote Link to post Share on other sites
bluehash 1,581 Posted March 17, 2013 Share Posted March 17, 2013 Thanks! Make sure you upload a small video. How many axes do you need on the accelerometer? Quote Link to post Share on other sites
VMM 36 Posted March 17, 2013 Author Share Posted March 17, 2013 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. Quote Link to post Share on other sites
rockets4kids 204 Posted March 17, 2013 Share Posted March 17, 2013 Nice! Do you have any better pictures? Did the case come from an existing watch, or did you fabricate that as well? Quote Link to post Share on other sites
izdane 6 Posted March 18, 2013 Share Posted March 18, 2013 That thing looks awesome! Where did you get the OLED for the watch? Quote Link to post Share on other sites
VMM 36 Posted March 18, 2013 Author Share Posted March 18, 2013 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. Quote Link to post Share on other sites
bluehash 1,581 Posted March 18, 2013 Share Posted March 18, 2013 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. Quote Link to post Share on other sites
VMM 36 Posted March 18, 2013 Author Share Posted March 18, 2013 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. Quote Link to post Share on other sites
jpnorair 340 Posted March 18, 2013 Share Posted March 18, 2013 low power accelerometers are very expensive. You could rig-up a piezo shock detector, though, for the sort of feature you're chasing. roadrunner84 1 Quote Link to post Share on other sites
xpg 127 Posted March 18, 2013 Share Posted March 18, 2013 That's really neat! Quote Link to post Share on other sites
VMM 36 Posted March 18, 2013 Author Share Posted March 18, 2013 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. Quote Link to post Share on other sites
mogorman 0 Posted March 18, 2013 Share Posted March 18, 2013 How long where you driving the watch with the display on? and what kind of mA are you drawing awake vs in sleep? Quote Link to post Share on other sites
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