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  • Author Author: popupideas
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Elevator test unit

popupideas

one diy test unit I want to build is a g-force accelerometer tested for elevators. Prefer a Bluetooth enabled box you put inside an elevator that when it is sent up it will record the travel speed, acceleration, start and stoppong force. It bit I had issues figuring out was vertical speed.

Anyway. I am a loooong way off but maybe one day

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  • Hi Chris,

    The only way to get velocity will be to measure the acceleration and integrate it over the time of the acceleration. If you are lucky and the acceleration is constant then you can get away with just measuring the acceleration and the amount of time it is applied. V=at. Once you have calculated the velocity you can calculate the other parameters. Accuracy of the instrument will all be tied to the accuracy of the accelerometer and synchronization with the timer.

    John

  • in reply to jw0752

    Hello John;

     

    I think that to avoid integration approach - that may result in a complex math difficult to support with reasonable processing time by slow microcontrollers like Arduino - is considering time a constant. So basing a timer sampling the punctual values you can get from the sensor you can build anyway a curve of acceptable data. As much you keep the sampling frequency high, as much it is precise. As sampling frequency remains a constant you can create the repeatable conditions to collect a reasonable amount of data for testing.

     

    Enrico

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  • in reply to jw0752

    Hello John;

     

    I think that to avoid integration approach - that may result in a complex math difficult to support with reasonable processing time by slow microcontrollers like Arduino - is considering time a constant. So basing a timer sampling the punctual values you can get from the sensor you can build anyway a curve of acceptable data. As much you keep the sampling frequency high, as much it is precise. As sampling frequency remains a constant you can create the repeatable conditions to collect a reasonable amount of data for testing.

     

    Enrico

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