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  1. #11

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    I remember that graph, the infamous one that got a whole thread deleted last year or so...

    But that's kind of the way that I think would be cool to go. Temp logging is much easier than getting a pAg electrode running though.

    You Houston guys should get an emulsion get-together going this summer and see what happens.
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

  2. #12
    Photo Engineer's Avatar
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    Yes, well, the graph was deleted but it will be in the book.

    I guess there might be parts of that left hanging around.

    PE

  3. #13

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    I'm glad that graph will be more exposure, I've got it in Bruce Kahn's hand-out. It is quite interesting.
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

  4. #14
    Nicholas Lindan's Avatar
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    Quote Originally Posted by totalamateur View Post
    Wouldn't a thermocouple and an ADC work?
    If you want to use a thermocouple you will also need a 'cold junction compensation' RTD (resistance temperature device or some other GDA). You will need an amplifier because a thermocouple will only put out a few tens of microvolts; the voltage developed is equal to the temperature difference at the two ends of the thermocouple wire, figure 40 - 60 uV/C depending on the thermocouple you choose.

    One RTD can service multiple thermocouples if the terminal block where they are terminated is the same temperature all across.

    Googling will bring up many examples. The processor used in the Adowhatsis board is an Atmel AVR ATMega chip. There is lots of information on the AVR available at 'AVR Freaks'.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  5. #15
    rmazzullo's Avatar
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    Hello Nicholas,

    Can you please tell me what GDA stands for?

    Thanks,

    Bob M.

  6. #16

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    Can you guys give more info on the Arduino and how it compares with other devices, like the BASIC Stamp? Easier, cheaper, more flexible?
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

  7. #17
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    Burr Brown makes a card that fits a PC slot and is covered with A/D and D/A converters. Between that and a USB, a lot of lab work can be done.

    PE

  8. #18

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    Arduino is way cheaper than the BASIC stamp (last time I checked) and I find it much easier to program, coming from a C/C++/C# background. SparkFun Electronics has about the best collection of Arduino boards (there are many) I've seen. They also have lots of other cool sensors and stuff for electronics projects, although no good temperature sensors unfortunately.

  9. #19
    Lee L's Avatar
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    Kirk,

    I haven't used a Basic Stamp, so can't comment on them knowledgeably, and I'm just getting started with the Arduino.

    I only found Burr Brown cards on ebay with a quick search, both ISA cards, one with 8 bits resolution and one with 32 bits. The 8 bit version had 16 IO lines. These would both have to remain hardwired to the computer. On ebay they were $200 - $400 used with no cables or software. Someone else will know a lot more than I on that score, and possibly have a better source.

    The latest Arduino board basics are here: http://arduino.cc/en/Main/ArduinoBoardDuemilanove

    6 analog inputs with 10 bit resolution
    16 digital IO pins, 6 of them with PWM output
    power 7-12 volts autoswitched to highest voltage input from USB port or standard coaxial DC plug (batteries or AC adapter).

    If it matters to you, the Arduino is cross platform (Microsoft, Mac, Linux, Unix), hardware and software open source and licensed to be free (as in no charge for the software, you can modify it, pass it along with mods, and it can't be put under restrictive licenses in the future, and the board layout can be modified and produced by anyone without restrictions). The Arduino IDE is the same interface compiled for the different platforms. There are lots of libraries included with and available for the Arduino to make it easy to program a number of devices.

    AFAIK, Basic Stamp is Parallax and a couple of clones. Their software is mostly (all?) free of charge, but more restrictively licensed, and may only be for Microsoft OS. I think there are third party IDE's for Basic Stamp under Linux that Parallax doesn't do support for. You can check the Parallax site to find out for sure. http://www.parallax.com/tabid/121/default.aspx

    There is a lot of online support for both Arduino and Basic Stamp. I've found a number of online tutorials for Arduino. (I'm sure the same must be true of Basic Stamp.) I've seen articles in Make and Linux Format magazines on the Arduino, and I believe Nuts and Volts has also had some Arduino articles.

    And Arduino is Java like programming while the Basic Stamp is like BASIC. Parallax also has an SX setup that's Java.

    Lee

  10. #20

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    OK - here's a simple temp sensor setup with the Arduino:
    http://webzone.k3.mah.se/projects/ar...tions/ntc.html
    Kirk

    For up from the ashes, up from the ashes, grow the roses of success!

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