Chronodot failing
Moderators: adafruit_support_bill, adafruit

Chronodot failing

by Zh4x0r on Fri Sep 14, 2012 2:15 pm

I'm using a Chronodot on a project that needs time to be accurate in the long run, but for some reason, the Chronodot keeps on randomly resetting to January 2000... no idea why...

It'll run just fine for a while, then all of a sudden, reset to 2000...

I have it hooked up to an Arduino over I2c, along with a Polar HRMI and a blinkm minm.

any ideas?

I've tried resetting the clock manually several times, but it still resets randomly.
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Re: Chronodot failing

by adafruit_support_bill on Fri Sep 14, 2012 3:28 pm

Is it resetting while powered, or while running on battery? Post photos front & back showing your soldering.
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Re: Chronodot failing

by Zh4x0r on Fri Sep 14, 2012 4:00 pm

I'm not quite sure when it's resetting, I'm currently running a test program to determine that, here are the photos, the other end of the cable shown goes to a block of pin rows where I connect all the i2c devices in the project (Chronodot, Sparkfun HRMI, BlinkM MinM) and all the other devices are performing normally

Image Image

I'm using http://forums.adafruit.com/viewtopic.php?f=25&t=24565 this chronodot library to connect to it and it reports data every time it's called, BUT at seemingly random times, it resets the clock to 2000.
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Re: Chronodot failing

by Zh4x0r on Fri Sep 14, 2012 4:02 pm

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Re: Chronodot failing

by adafruit_support_bill on Fri Sep 14, 2012 4:35 pm

You have one of the newer version with a pre-attached battery holder and the other soldering looks OK. Check the voltage on your battery.

As far as I know, the only thing that should reset the chip is a complete loss of power (including battery). MaceTech (the people behind the Chronodot) stop by these forums fairly regularly, but you might try querying them direct to see if they have any other ideas what might cause it. http://macetech.com/store/index.php?main_page=contact_us
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Re: Chronodot failing

by Zh4x0r on Fri Sep 14, 2012 4:39 pm

battery voltage is 3.09, so i think that should be fine, i'll contact them and see if they have any ideas.

Thanks!!
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Re: Chronodot failing

by neutron spin on Fri Sep 14, 2012 4:54 pm

Hello,

I looked at your board and the +VCC pad looks a little suspect. I would re-flow that pad and run your Chronodot again to see if the dropout still occurs...Just my 2 pennies worth.. :D
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Re: Chronodot failing

by Zh4x0r on Fri Sep 14, 2012 5:03 pm

Just rechecked it, the image makes it look weird, but looking at it under a magnifier shows it's flowed fine. I think part of the solder got gouged when I cut off the excess wire.

Thanks for the tip tho!
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