Note: Try to complete tasks 4.1.2, 4.3.1, 4.4.1, 4.4.2, 4.5, and 4.6.1 before coming to the WorkINGLab so that you have more time for the experimental part.
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This experiment requires you to bring a laptop to read a sensor by an Arduino. |
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We highly advise you to prepare as much as possible at home before conducting this experiment. Sketches for circuit setup are recommended. |
1. Context of the Experiment
This experiment concerns resistive sensors and especially their usage in Wheatstone-bridges. Resistive sensors transmit information by a change in resistance due to external influences such as temperature, bending, light, etc. In the course of this experiment, you will learn, how to measure this change, even if it is very small, and how to compensate for some common errors.
2. Learning Goals of this Experiment
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[4] HBM-homepage: Wheatstone-bridge circuit (German webpage with correct table: https://www.hbm.com/de/7163/die-wheatstonesche-brueckenschaltung-kurz-erklaert/)
Necessary further reading/datasheets:
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4.2.1 Measure the voltage with the multimeter across the strain gauge for both the unloaded and loaded beam. What is the difference in voltage between loaded and unloaded beam? Hint: you can even measure at the screws of the luster terminal as they are in contact with the clamped wires (fig. 6).
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4.3.2 Insert your value for zeroMVinput and your value for mV/digit into the Arduino code. You will need to provide those values in Vips later. 💾 (Please insert your code where the comments mention it and then uncomment those parts!)
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