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watch crystals from cheap watch for rtc watch crystals from cheap watch for rtc
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Micro Controllers Discuss all aspects of micro controllers - building them, coding them, etc. All controllers are welcome - PIC, BASIC, Z8 Encore!, etc.

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Old 18th May 2004, 10:22 AM   (permalink)
Default watch crystals from cheap watch for rtc
I saw some cheap watches(2 for $1).

Do all digital watches use 32.768kHz crystals or do they vary?

Can these be used in PIC projects(eg. RTC)?

Would it be a bad idea to use crystals from a cheap watch?
JunglePython is offline   Reply With Quote
Old 18th May 2004, 11:14 AM   (permalink)
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:wink:
All the watches I have seen use them, but your pic will run very slowly......32khz/4 or 8khz :?

:idea: Buy the watches, sell em on ebay, and save up for some new higher speed crystals!! :wink:
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MATT!
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Old 18th May 2004, 11:51 AM   (permalink)
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Quote:
Originally Posted by Matt(Pic progger)
:wink:
All the watches I have seen use them, but your pic will run very slowly......32khz/4 or 8khz :?
That's the point!, power consumption is directly related to clock speed, so by using a slow clock you reduce consumption drastically. Obviously the program will run fairly slowly, but often that doesn't matter, battery life can be far more important.

PIC's even have an LP clock mode (Low Power), designed to use 32KHz crystals.
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Nigel Goodwin is online now   Reply With Quote
Old 18th May 2004, 12:11 PM   (permalink)
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:wink:

Yeah, I got that 1 nigel, sorry, just in a bit of a "off at a tangent" kinda mood today, you may have trouble staying with me..... not that you probably would want to....

OK so the "grown up" answer, don't sell the watches on ebay and make a fortune, strip them down, solder very fine wires to the very short ones on the ripped out watch crystals, fit them to your PIC circuit and marvel at the fact that for 1/2hr's work you have saved 20Cents and re-cycled an otherwise redunadnt piece of stock.... :wink: :lol:

Oh yeah, and make yourself some timers, bit like a watch really only not as pretty and probably more painfull to wear on your wrist...... :wink:

So in answer to the original question........ what was it again??? :P
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MATT!
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Old 19th May 2004, 02:09 AM   (permalink)
Default 32 k xtals
Hi Jungle Python,

Rocky in Melbourne sell 32 k xtals, excellent price.

Rocky.com.au
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Old 19th May 2004, 04:24 AM   (permalink)
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brilliant!

Thnx a bunch.
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Old 19th May 2004, 04:35 AM   (permalink)
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Hey I tried rocky.com.au and it came up with nothing.

Are you sure about that url.

Cheers

Luke
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Old 19th May 2004, 12:56 PM   (permalink)
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try http://rockby.com.au
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Old 19th May 2004, 08:52 PM   (permalink)
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Thank you
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Old 21st May 2004, 02:47 AM   (permalink)
Default Rockby and rocky
Sorry Jungle Python

Missed a letter.

Peter
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