Real Time Clock

Discussion of ideas for your ultimate dream charger/analyzer
Mark
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Joined: Sun Jul 28, 2013 6:47 am
Location: Brisbane, Australia

Real Time Clock

Postby Mark » Thu Oct 24, 2013 4:57 am

I think it could be useful to have a real time (battery backed) clock so that the log files could show actual dates and times when charging/testing of particular cells was done.

Combined with the idea for a bar code scanner, it would allow for a complete history of each battery to be kept.

It would also mean that the charger could be set to automatically perform a discharge/recharge refresh whenever a cell had been more than X many months since the last refresh.

Paul.Allen
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Location: Utah, United States

Re: Real Time Clock

Postby Paul.Allen » Thu Oct 24, 2013 5:04 am

I think this is a great idea as well and would not be hard to implement.

RLBrooks
Posts: 13
Joined: Fri Nov 29, 2013 4:37 am
Location: Walla Walla, WA (USA)

Re: Real Time Clock

Postby RLBrooks » Fri Nov 29, 2013 5:33 am

Make it optional with something like the Chronodot real-time clock module? Cheap enough for a user to buy and plug into their charger if they wanted it.

> http://shop.evilmadscientist.com/component/content/article/159
> http://docs.macetech.com/doku.php/chronodot_v2.0

Russel

Mark
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Joined: Sun Jul 28, 2013 6:47 am
Location: Brisbane, Australia

Re: Real Time Clock

Postby Mark » Fri Nov 29, 2013 6:19 am

The controller that will probably end up being used for the 4 cell charger has its own RTC built into it - I think that all it needs is a crystal and the external battery added.

Paul.Allen
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Joined: Tue Aug 06, 2013 5:33 am
Location: Utah, United States

Re: Real Time Clock

Postby Paul.Allen » Fri Nov 29, 2013 7:05 am

I am adding the RTC crystal for the LCD version right now (part of the extra cost), but not the battery backup. I wonder if we could do a super-cap for the RTC instead of a battery? I will keep it in mind.

Mark
Site Admin
Posts: 411
Joined: Sun Jul 28, 2013 6:47 am
Location: Brisbane, Australia

Re: Real Time Clock

Postby Mark » Fri Nov 29, 2013 7:16 am

I haven't really read up on super caps myself, but they'd probably be fine for the job. Even a regular capacitor might be sufficient to keep the RTC going for days/weeks.

The main question I'd have is what the self discharge is like for the capacitors - it could well be higher than the current drawn to keep the RTC running...


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