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Chris_C17/09/2019 10:29:58
15 forum posts

As Michael you've ordered the kit, and Geoff as you say you have a few, how good are they at keeping time?

15 or so years ago I used an 8 pin PIC to replace the mechanism in a cheap ball bearing clock when the contacts stopped triggering the ball lift arm and driven by a crystal I had to calibrate the system and add a cal factor in the firmware to get to within a minute every 6 months.

Nowadays, I just put an RTC on board, which I can't see on those boards. Would be interesting to know if I don't need to!

Michael Gilligan17/09/2019 13:39:03
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Posted by Chris_C on 17/09/2019 10:29:58:

As Michael you've ordered the kit, and Geoff as you say you have a few, how good are they at keeping time?

[ ... ]

.

Having only ordered them yesterday: I have no idea how good the timekeeping really is. Chris ... but the ebay listing claims +/- 1second per 24 hours.

[quote]

D. accurate travel time, travel time error range error -1 to +1 seconds every 24 hours.

[/quote]

Hopefully Geoff can confirm ^^^

I bought them primarily because it's a kit of identifiable parts ... some, or all, of which are sure to be useful.

[much easier than trying to hack into an amophous blob of ready-made clock module]

MichaelG.

[Mildly amused by the change of thread title .... Perhaps the moderator would be so kind as to also remove the original subtitle, which now seems redundant.]

JasonB17/09/2019 14:44:04
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Done having seen comment in other thread.

Michael Gilligan17/09/2019 22:04:16
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13975 forum posts
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Thanks, Jason

MichaelG.

Geoff Theasby17/09/2019 23:21:48
593 forum posts
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Hi all,

My Practical Wireless article was July 2018. Sorry for the delay in replying, I was distracted, it is our 14th wedding anniversary.

I confirm that my clock keeps good time, close enough not to need resetting between power cuts etc., (roughly yearly) There is no backup battery. I don't use the alarm setting, but in another, more complex kit, the alarm time creeps backwards by 1 minute per day..

Michael Gilligan18/09/2019 00:08:10
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13975 forum posts
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Thanks for that, Geoff

... and congratulations !!

MichaelG.

Chris_C18/09/2019 11:23:34
15 forum posts

Thanks both!

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