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Forum Index : Microcontroller and PC projects : Clock crystal

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vasi

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Joined: 23/03/2007
Location: Romania
Posts: 1697
Posted: 03:33am 04 May 2014
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Hi guys,

Can anyone tell me if I can use a miniature (those are smaller that what we buy on online stores) crystal from a regular digital clock for a PCF8583 RTC? Are those standard, or there are different frequencies?

Vasi
Hobbit name: Togo Toadfoot of Frogmorton
Elvish name: Mablung Miriel
Beyound Arduino Lang
 
bigmik

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Joined: 20/06/2011
Location: Australia
Posts: 2914
Posted: 10:01am 04 May 2014
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Vasi,

You could try to scavenge one from an old (or cheap LCD/ electronic wrist watch)

Regards,

Mick
Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<
 
vasi

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Joined: 23/03/2007
Location: Romania
Posts: 1697
Posted: 10:27am 04 May 2014
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Thanks Mick, almost exactly what I asked (should have said watch ) - so, it is good. I scavenged one and soldered on the board. My board is almost ready, then I will make some tests before posting about it.

Vasi
Hobbit name: Togo Toadfoot of Frogmorton
Elvish name: Mablung Miriel
Beyound Arduino Lang
 
atmega8

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Joined: 19/11/2013
Location: Germany
Posts: 722
Posted: 11:46am 04 May 2014
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Reichelt.de
Pollin.de,

Cylindric, 2x5mm, approx.

Some Cents
 
bigmik

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Joined: 20/06/2011
Location: Australia
Posts: 2914
Posted: 08:48pm 04 May 2014
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Sorry Vasi,

Yes I thought you wanted a super small 32khz `rock'.. Yes saying watch would have made me see what you were really asking.

As far as I know the 32kHz crystal is the only one (well 99.99%) that is used in clocks.

mick
Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<<
 
vasi

Guru

Joined: 23/03/2007
Location: Romania
Posts: 1697
Posted: 07:16am 09 May 2014
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Thanks Mick, it works indeed. Is a little faster and definitely needs a trimer for adjustment. A temporary solution, good for testing and firmware development, but not for final application, as there is not much precision. But now I'm able to continue my work (I've finally ported the PCF8583 library from avr-gcc to JALv2).
Hobbit name: Togo Toadfoot of Frogmorton
Elvish name: Mablung Miriel
Beyound Arduino Lang
 
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