Section 25.4 Assignment
For this assignment you are to wire up a strain gauge and load cell amplifier and calibrate the sensor using known weights and another digital scale. First, set the scale value to zero and then place known weights on to the load cell and record the output. Place the known weight on a different calibrated scale and record those measurements as well. Repeat this experiment for 10 different known weights and plot the actual weight on the y-axis from the known digital scale and the output from the load cell on the x-axis. Use this data to compute a regression curve similar to Chapter 19 and write the equation relating load cell output to actual "weight" (mass) in kg and report the scale value necessary for your code.
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Title page with name,title and date - 5%
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Introduction with wiring diagram - 5%
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All figures must have appropriate annotations, figure captions, figure labels and a paragraph of supporting text - 10%
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Include a photo of your CPX/CPB connected to your amplifier and load cell. - 10%
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Include a screenshot (entire computer screen) of Mu showing the Plotter open showing load cell data as you press on the strain gauge - 10%
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Include a table of your known weights and load cell output in kg. - 20%
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Include a Figure of your calibration data plotted with your trend line on top. Put your \(r^2\) value in the title of the plot - 20%
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Write your regression equation as (actual weight = load cell output / scale) being sure to replace scale with your actual values. Remember to round to appropriate significant figures - 10%
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Using your calibration equation imbedded in your Mu code, place an unknown weight on your load cell and see what the output is and compare to the actual weight once you place it on a scale. Include a photo and screenshot of this experiment - 10%
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Appendix A - Video Details - Film yourself and your entire screen showing the load cell value changing as you press on the strain gauge. - Pass/Fail
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Appendix B - Code used to take data and code used to plot in plain text (no screenshots) - Pass/Fail
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Appendix C - Screenshot of Excel or Sheets if applicable - Pass/Fail
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If you are asked to fix something in the Appendices such as missing content in your video or screenshots of your code, you will lose 10% of your grade everytime you submit an update after the deadline.
