> Octopart'd: http://octopart.com/info/Philips/PCF8563T%2FF4%2C112
> Avnet has them for USD$0.82.

> On Dec 9, 10:34 am, Enkel Bici <enkelb...@gmail.com> wrote:
>> You could put a real time clock there, instead of the crystal and put
>> the atmega on sleep. Potentially this could be battery saver, since
>> the atmega draws very little power in sleep mode and with the internal
>> oscillator it can work at a much smaller voltage.
>> The price shouldn't be much higher, i've found this RTChttp://it.farnell.com/nxp/pcf8563t-f4-112/rtc-calendar-smd-8563-soic8...
>> (note: I'm not working for them, I'm just a customer) it communicates
>> through i2c and draws very little current so it can stay always on.
>> Keep up the good work!

>> On Dec 9, 1:56 am, bre pettis <brepet...@gmail.com> wrote:

>> > Feel free to just take out the 16mhz crystal and get another one in there.
>> > The crystal I'm wearing on my wrist right now isn't even smd, I just bent
>> > the leads over to make it work.

>> > If you do end up messing with the fuses, make sure to modify and share the
>> > boards.txt file.

>> > Cool!

>> > Bre

>> > On Tue, Dec 8, 2009 at 5:29 PM, Ben Combee <ben.com...@gmail.com> wrote:

>> > > > Let me preface that I have not used the Atmel architecture before,
>> > > > only PIC.

>> > > > Anyway, my hope was that with a 32.768khz crystal, you could sleep in
>> > > > between crystal pulses and extended battery life by a whole bunch.
>> > > > 32768/16M = 0.205%, so say 1% to include processing. You only need to
>> > > > pulse the LEDs every once in a while, and POV in the human eye will
>> > > > take over.

>> > > > Anywho, I smell some major hackery about to take place. =)

>> > > It would actually be a pretty interesting hack -- use the internal
>> > > 8MHz oscillator with the crystal pads used for input from a 32.768khZ
>> > > crystal.  You'd have to change the fuses configuration when burning
>> > > the bootloader on the board, but that's not too bad.