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softRTC: Studying prior art

A project log for A simple non-bomb clock or two

Gets attention, tells time, promotes knowledge of the electronics hobby & DIY/STEM in general, and advertises my local hackerspace a bit

PointyOintmentPointyOintment 09/22/2015 at 17:261 Comment

As I said earlier, I tried to get the Arduino to keep track of time on its own, to denecessitate the DS1307, which in turn would denecessitate using the USB battery. JeeLabs's/Adafruit's RTClib was too confusing and overkill, and my simple implementation seemed to be picking up mains noise on the button pins (even with internal pull-up, and even when I gave them zero-ohm pull-up/pull-down). I haven't made any progress on this since then, but the other week I ran across an ATmega328P-based wristwatch called ChronosMEGA, the instructable for which is extremely detailed. I'm reading through that today to try to learn better ways to do what I want to do. It also claims 11 years of standby battery life!

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davedarko wrote 09/22/2015 at 18:01 point

that's something I have to find out as well, I guess... here's the App Note http://www.atmel.com/Images/Atmel-1259-Real-Time-Clock-RTC-Using-the-Asynchronous-Timer_AP-Note_AVR134.pdf

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