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[picster]

Just in case - If you changed the battery on the DS1307 or removed it, I believe you'll need to send the enable bit code to get it running again otherwise your time will not change but will be stuck where it was when it lost backup power.

btw, the DS3231 is tremendously more accurate, in case you wanted that improved. It leaves the 1307 in the dust.

Picster

[Scampy]

thanks for the comments guys,

I've attached board layouts as requested. I've been out this afternoon, so will have a further play in reducing the ic2 pullups to see if that helps