forum.hobbycomponents.com

Just to update, replacement arrived today along with my nano order - superfast replacement, thanks! Just fitted it and it's all working fine. Appears to have lost no time at all in 30 mins off power - that's good enough for me :-) Thanks again, excellent CS for an ebay seller. Already recommended yo...

@andrew

Have emailed my ebayID.

It's been running all day on 5V and kept time fine, an hour this evening on bat and it's already lost 15 mins. Am looking to get another nano anyway so if that helps save you postage to send a replacement then that would work for me...

cheers

@andrew

When running from the 5V feed from the arduino it's fine - it only loses time when disconnected (ie, running from it's own lithium battery). Is that what you meant?

ok, just left it unplugged for 15 mins and it's lost 2 mins (just over) using your sketch from the first post (with the set line commented out obviously :-)). They aren't all this bad then? Sounds like I've a duff one. I've tried (after posts elsewhere from someone with similar problems) ensuring th...

ok, just tried that sketch and the HCRTC lib and it appears to work fine. Have set the time using it, commented out the line and unplugged - will see what it thinks the time is in a bit...

Just check voltage at the battery - 4.08V (that's after a day being unplugged as well) so that seems fine.

Using the lib from http://www.pjrc.com/teensy/td_libs_DS1307RTC.html which I've used before - albeit not with your modules. Will try with the code you suggest when I get a chance.

Cheers

Hi, Thanks for the update :-) The 2.84V was measured at the BAT pin (between BAT pin and the GND pin next to it). Not measured at the battery - will try this evening. As I say, it's holding memory and appears to be working, it's just horrendously inaccurate at keeping time when not powered (kinda th...

Hi, purchased one of the tiny RTC modules a while back from ebay store (item 140991415422) and finally got around to using it this weekend. While it works, I'm surprised at how much it drifts... In 24 hours without power it seems to have lost 1 hour 15 mins! I know it's not a top notch temp compensa...