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Recommendations on real-time clock and calendar chip(s) — Parallax Forums

Recommendations on real-time clock and calendar chip(s)

ParsecParsec Posts: 20
edited 2010-04-01 06:35 in BASIC Stamp
Hello everyone out there in the BS2 world!
Does anyone have any recommendations on RTC & Calendar boards/chips that they've interfaced with BS2? I was looking at this little mac daddy board on ebay: cgi.ebay.com/I2C-RTC-I2C-Real-time-Clock-RTC-BASIC-STAMP-PIC_W0QQitemZ150302042102QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item22feb327f6&_trksid=p3286.c0.m14

I noticed that the Parallax store had the DS1302 chip for $5, but the ebay board looked nicely featured, seems like a steal for $17

Thanks!

Comments

  • sam_sam_samsam_sam_sam Posts: 2,286
    edited 2009-09-26 02:50
    This one is more of a steel

    http://www.futurlec.com/Mini_DS1307.shtml

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    Sam
  • ParsecParsec Posts: 20
    edited 2009-09-26 17:00
    Thanks Sam! That RTC looks pretty cool, I like their Ethernet board too! One project I'm considering is building something similar to this controller that monitors pH, ORP, temp, etc for my 75 gal aquarium. These Neptune controllers are the bomb, but just really expensive. At the end of the day though, they're merely doing some A/D, display, data logging, and with the Aquanotes software, they're just logging via TCP to some database or flat file then plotting the data (hello MSDE or MySQL and Excel or Flash graphs??) smile.gif I need a new job... watching everyone around me get rich while I pick my nose working for someone else...

    www.neptunesys.com/~clp/index.php?option=com_content&task=view&id=19&Itemid=40 eyes.gif
  • Mike2545Mike2545 Posts: 433
    edited 2009-09-26 23:17
    I have used the Gravitech Real Time Clock on a few projects. For nothing else, they give you sample code to use, and in my mind that is worth a few extra bucks.

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    Mike2545

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  • Carl HayesCarl Hayes Posts: 841
    edited 2009-09-27 16:04
    If you need great accuracy, a DS1340 has an advantage over a DS1307: it's adjustable. Without changing crystals, you can speed it up and slow it down, slightly, by setting bits in a control register. I've always been a little disappointed that Gravitech used the DS1307.

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    · -- Carl, nn5i@arrl.net

    Post Edited (Carl Hayes) : 9/27/2009 7:45:30 PM GMT
  • Mike2545Mike2545 Posts: 433
    edited 2009-09-27 22:39
    Carl Hayes said...
    I've always been a little disappointed that Gravitech used the DS1307.

    The one I have on my BB right now from Gravitech is the DS1340

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    Mike2545

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  • icrashplanesicrashplanes Posts: 1
    edited 2010-04-01 06:35
    Hi all.· Ipurchased a DS1307 board from futurlec - seems well made.· I am using a stamp 2sx -my problem is that it doesn't respond with an acknowledge low when I send it a read instruction (%11010001) via a

    SHIFTOUT SDA, SCL, MSBFIRST, [noparse][[/noparse]%11010001\8]

    SHIFTIN SDA, SCL, MSBPRE, [noparse][[/noparse]response\1]

    ·I DO get an acknowledge low when the same code is sent for a write (%11010000).· Anybody had this problem and/or a solution?



    Thanks
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