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Read and Store from datalogger without pc — Parallax Forums

Read and Store from datalogger without pc

Dave NewbieDave Newbie Posts: 7
edited 2005-06-02 15:29 in General Discussion
Hi there , I am a newbie to stamp & pic. Wondering if someone can help me . I need to build or purchase a Datalogger that can read and store data from another datalogger. I do wish to use a pc for this task. any help will be appricated Thank you Dave

Comments

  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-05-28 03:53
    Dave,

    ·· You need to provide a few more details.· We don't know what kind of datalogger you have, or how it connects to the outside world to transfer data.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • NateNate Posts: 154
    edited 2005-05-28 10:51
    Dave,

    I just completed a project that does this.· It utilizes the SX microcontroller.· One module is the dataLogger (temp, time, and position of various valves) and a second module is one that I use to go out and collect the stored data with (the data transporter).· Currently, I physically plug them together when uploading the data, but I am working on a RF·download/upload module.· I then take to data transporter module and upload the data to a PC for manipulation/long term storage.

    You could of course modify this data transporter to use with a data logger that you may already have, but as Chris noted, you will need to know what system and protocall the data logger uses for communication.

    Nate


    Post Edited (Nate) : 5/28/2005 11:02:01 AM GMT
  • Dave NewbieDave Newbie Posts: 7
    edited 2005-05-28 11:54
    Hi chris , like I was saying I am a newbie to this, all I know is it is Picaxe datalogger and it has a serial port to downlod to PC. Your data Tranporter sounds good.Ias it possible toi get some detail on that .
    Thank You Regards Dave
  • NateNate Posts: 154
    edited 2005-05-28 13:21
    Dave,

    The PICAXE datalogger is a simple datalogger built around a PIC microprocessor.· Do you have the PICAXE software on a·PC that is normally used to connect with the PIXAXE?·

    (You may know this already:· This software allows one to connect the PICAXE·to·a PC·(using the programming port on the PICAXE) and program the datalogging parameters (sensor types, number of sensors, how often to record data etc.).· One then disconnects the PC from the PICAXE and deploys the·PICAXE·to record·data.· When it is desired that the collected data·be retrieved,·the·PICAXE is again connected to the PC (using a data port on the·PICAXE·this time) and a command is sent·to the PICAXE to send the stored data up the PC/PICAXE connection cable)

    I am assuming you want to be able to retrieve the data without bringing the PICAXE back to the computer.· This can be done, but you need to know how the PICAXE was initally programmed (when the inital datalogging parmeters were downloaded) to give up the recorded data.· If you have the computer software for the PICAXE, or you programmmed it, then you know this info.· If not, you need to a little digging to get it.· You will need this info before you can utilize any sort of dataTransporter.

    Is this a project where you simply want to utilize a PICAXE that you already have?· Or do you have a datalogging mission where you can't find data logger that will do exactly what you require?

    Nate
  • WarrenWarren Posts: 9
    edited 2005-05-28 13:43
    Hi Nate-

    Your data logger is very close to what I want, especially after you get the upload/download part completed. Please let us know how it works. Thanks, Warren
  • Dave NewbieDave Newbie Posts: 7
    edited 2005-05-31 02:44
    Thank you very much for info Nate, I need to download data without a pc. I am digging some info on the software and I will come back to you ASAP but I am still interested in your data transporter.

    Regards Dave
  • AndywatsonAndywatson Posts: 6
    edited 2005-06-02 14:44
    I am working on this same problem, and I haven't figured it out yet. I'm trying to make a datalogger, and I've tried using a BS2 and then with a PICAXE. I can read the analog sensors just fine, but I can't figure out how to write the data to an external memory and download it to some type of data transporter. Eventually, I'll have 5 to 10 of these loggers deployed in an area, taking ~300 measurements each day for several months. Can anyone recommend what type of memory I should use (EEPROM, Flash, etc), and how can I download it to a transporter in the field?
  • Robert KubichekRobert Kubichek Posts: 343
    edited 2005-06-02 15:23
    Andywatson said...
    I am working on this same problem, and I haven't figured it out yet. I'm trying to make a datalogger, and I've tried using a BS2 and then with a PICAXE. I can read the analog sensors just fine, but I can't figure out how to write the data to an external memory and download it to some type of data transporter. Eventually, I'll have 5 to 10 of these loggers deployed in an area, taking ~300 measurements each day for several months. Can anyone recommend what type of memory I should use (EEPROM, Flash, etc), and how can I download it to a transporter in the field?

    Try the Alfat with SD cards

    http://www.ghielectronics.com/ALFAT-SD.htm

    All you need to do is swap out cards and pull the data up on any PC..

    scool.gif

    Bob N9LVU
  • Paul BakerPaul Baker Posts: 6,351
    edited 2005-06-02 15:29
    Andy,
    Before I get into the pros and cons of various memory types, let me ask you a few questions:

    1) how much data is being stored each reading?
    2) how frequently will the data be re-written?
    3) can you define "several months", people's definition of the term varies.

    With the answer to these questions I can pick out the best type of memory and what size you'll need.

    The second part of your question I'll address later.
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