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Forum Question - 2 Channel Photometer
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  • photometer
  • temperature
  • two_channel
  • raspberry-pi
  • stem space
Related

Question - 2 Channel Photometer

mikedavis
mikedavis over 10 years ago

I have a question regarding a 2-channel photometer that I got from Nearsys.  I would like to use a Raspberry Pi as a computer to collect data with this.

 

My college got some funding to do some high altitude weather ballooning, and this was one of the sensor that was purchased to collect temperature and light information from near space.  A guide for the sensor is here: http://nearsys.com/catalog/sensor/2photoplan.pdf

 

I soldered everything up, and I would like to be able to test it on the RPi, first to see if I get a signal, and second to see if I get something reliable. 

 

Is there any advice on how I should connect this to the GPIO on the RPi.  A (very cursory) web search didn't show me much that I could make sense of.  However, if there is a resource that could help me connect it, I am sure there is or could be a Python program that will do the necessary conversion of voltages into signals.

 

Any help would be appreciated.

 

Thank you!

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  • gadget.iom
    0 gadget.iom over 10 years ago

    The module you are referring to outputs three analogue (0-5v) values. The Raspberry Pi does not appear to have any on-board ADCs so you will need some additional hardware. Information about a typical approach is available here: https://learn.adafruit.com/reading-a-analog-in-and-controlling-audio-volume-with-the-raspberry-pi/overview.

     

    It refers specifically to an MCP3008 IC. Which is an 8 channel device, so one of these should be all you require.

    More info available here: https://www.adafruit.com/products/856

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  • mikedavis
    0 mikedavis over 10 years ago in reply to gadget.iom

    Thanks.  I appreciate the help.  I was also thinking of trying an Arduino on it as well.  I recently saw the lack of an A2D converter on the RPi.

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  • mikedavis
    0 mikedavis over 10 years ago in reply to gadget.iom

    Thanks.  I appreciate the help.  I was also thinking of trying an Arduino on it as well.  I recently saw the lack of an A2D converter on the RPi.

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  • gadget.iom
    0 gadget.iom over 10 years ago in reply to mikedavis

    Arduino will handle ADC natively. image

    Just be aware that some newer versions of the Arduino (such as the Due) operate on 3.3v instead of 5.

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