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    pablosoup1

    @pablosoup1

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    Latest posts made by pablosoup1

    • RE: troubleshooting new colorimeter

      Will,

      I followed your instructions on checking the sensor board - and everything is fine now. I'm not sure if it had an impact, but I did switch to a new USB hub that may provide a bit more power than the ancient Mac Mini I was using before. I know that the USB connection can definitely cause issues with Arduinos - but I do not know that it was the cause of this problem.

      Thanks,
      Paul

      posted in Colorimeter
      P
      pablosoup1
    • RE: troubleshooting new colorimeter

      Thank you for the suggestions. i'd tested the LEDs (they work), but not the sensor board. I'll give that a go this morning and report back.

      Even with this (relatively minor) glitch, I think highly enough of the colorimeter that I've already bought a second for off-site use in water quality monitoring.

      Now, if someone would help me figure out how to put the LEDs and sensors at a right angle to each other, rather than a direct pass-through, I could have a fluorometer for measuring chlorophyll A and phycocyanin!

      posted in Colorimeter
      P
      pablosoup1
    • troubleshooting new colorimeter

      About two weeks ago, I purchased and assembled the colorimeter. It was working beautifully -- up until today.

      This afternoon, I started taking readings of ammonia using the API ammonia test kit. It looked like it calibrated fine, but the readings all came back 0.00. I rebooted my computer (Colorimeter software v.4 and v.5 tried on MacOS Catalina on a 2012 Mac Mini), but that didn't help.

      Next step, I loaded the software onto a MacBook Air - same problem: after calibration, all readings are zero.

      Just FYI, the samples definitely had plenty of color (the A620 values on a spectrophotometer were all above 0.78). Any suggestions on what to try?

      posted in Colorimeter
      P
      pablosoup1