Milligram balance scale interfaced with Parallax Propeller

Posted on Tuesday, March 5th, 2013 in measurement, Parallax Propeller, Videos by the machinegeek

Ben Krasnow developed this dispensing system that can measure out a desired mass of material via a dispensing valve controlled by a Parallax Propeller. He already had an American Weigh Scales miniPro-100, and decided to hack it so that the Propeller can discover how much mass is on the balance and regulate the dispensing valve appropriately. “The balance contains a Cirrus CS5530 24-bit ADC. I tapped the clock and data lines and found bursts of data that occurred at 7.5Hz. The clock is about 150KHz. I used a Parallax Propeller running assembly in one of its cores to capture the data stream and load it into my main program.”

This video concentrates on the scale/Propeller connection, and Ben plans to detail the dispensing mechanism control in a later video.

This entry was posted on Tuesday, March 5th, 2013 at 2:00 pm and is filed under measurement, Parallax Propeller, Videos. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

3 Responses to “Milligram balance scale interfaced with Parallax Propeller”

  1. Paul says:

    It’s a good explanation of what he did and how the scale works, but unless I’m missing something obvious can’t just about any micro with a serial module do this?

  2. Destate9 says:

    If it were me, I would try to intercept and interpret data from the microcontroller to the LCD because it sounds like his set up doesn’t take into account the temperature compensation.

    Also, I want that oscilloscope

  3. JBeale says:

    I’m not familiar with that particular scale, but does it actually employ temperature compensation?

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