True, I could do it with another part fairly easily. I was trying to keep down the parts count (and cost) since the micro already has a 32kHz clock and keeps time. My pick and place machine (me) gets grumpy if the board has too many parts. ;-)
I'll add a supported I2C RTC device to the wish list for the A1 boards. -Ron On Monday, April 14, 2014 5:10:52 PM UTC-5, Eric wrote: > > Ron, > > As for adding a RTC to the board all the drivers for that are already in > the kernel. Just add one of the following RTC chips: DS3232 (high > accuracy), DS1338C, DS1339C, or DS1374 all of which can attach to the same > i2c pins as your cape EEPROM. Given the pcb cad files I'm guessing it > would take 5-10 minutes tops to add a RTC to your board and getting the > software to use it another hour tops. > > Eric > > > On Mon, Apr 14, 2014 at 8:54 AM, Ron B. <r...@andicelabs.com <javascript:> > > wrote: > >> Hi Jason, >> >> Thank you for the comments (and the order!). The first batch of boards >> was very small due to parts availability. Still waiting on a zener to come >> back in stock (current estimate is beginning of May). >> >> The cape firmware does currently allow for a timeout to be set that will >> power the BB back on. The cape also monitors 3V3 so it knows when the BB >> has powered down and then will then cut 5V (and reset the timeout if you've >> set one). It is my intention to add a RTC to the firmware but I really >> need to create a kernel driver for it to provide the proper RTC interface >> and so that everything else is accessible through sysfs. >> >> I have thought about moving the components to the "bottom" of the board >> to make the top "slick". I'd probably have to scoot a component or two >> around but that should be completely doable. These lithium battery packs >> get pretty small. My final prototype now lives in a Logic Supply case >> which I think is a pretty nice setup. Without the stacking connectors, the >> cover just needs to be raised one position. Photo >> here<http://andicelabs.com/wp-content/uploads/2014/04/P3_BBB_LS.png> >> . >> >> The reason that I put the JST connector onto the cape is because the >> lithium packs from AdaFruit and SparkFun seem to all have them >> pre-installed. The battery in the pic is from AdaFruit and is 1200mAh. >> That runs an idling BBB for nearly 3 hours! >> >> -Ron >> >> On Monday, April 14, 2014 8:49:37 AM UTC-5, Jason Kridner wrote: >>> >>> On Fri, Apr 4, 2014 at 11:09 AM, Ron B. <r...@andicelabs.com> wrote: >>> > Hello fellow enthusiasts, >>> > >>> > Please check out my Power Cape and let me know what you think. Yes, >>> they >>> > are for sale but I would also value your feedback. >>> >>> I seem to have bought the last one in stock with stacking headers. >>> >>> Be sure to register your capes on http://beaglebonecapes.com and >>> http://beagleboard.org/project. >>> >>> My "dream" power cape would include an RTC and the ability to set >>> alarms to wake-up and/or power-up the board. I also dream of a power >>> cape that would allow the battery and cape to still fit in an Altoids >>> tin, sandwiching the battery between the boards and eliminating any >>> connectors components that would extrude beyond those boundaries. >>> Then, insulating the tin with a non-conductive material would allow >>> for containing a running Bone and I'd just make a cut-out for the USB >>> connectors. >>> >>> That said, I really like what you've created, which is why I bought one. >>> :-) >>> >>> Do you have a recommended battery supplier? >>> >>> > >>> > Thanks, >>> > -Ron >>> > >>> > -- >>> > For more options, visit http://beagleboard.org/discuss >>> > --- >>> > You received this message because you are subscribed to the Google >>> Groups >>> > "BeagleBoard" group. >>> > To unsubscribe from this group and stop receiving emails from it, send >>> an >>> > email to beagleboard...@googlegroups.com. >>> > For more options, visit https://groups.google.com/d/optout. >>> >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to the Google Groups >> "BeagleBoard" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to beagleboard...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/d/optout. >> > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
