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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

Anonymous

  • Another aspect of elevators that might be problematic is that they usually take a couple seconds to settle or completely stop as they reach their destinations. Due to the low velocity and deceleration at these points the time becomes the dominate parameter and will likely throw off calculations of distance and velocity.

     

    John

  • in reply to dougw

    ...and then these guys at thyssenkrupp Elevator come along and ruin your day...

    https://multi.thyssenkrupp-elevator.com/en/

     

    An Elevator That Actually Goes Sideways

    https://www.youtube.com/watch?v=kdTsbFS4xmI

  • You can figure out (or calibrate) the distance by the trip time, because the precise distance is quantized (by the number of floors).

    You can get the average speed by dividing the distance by the time of the trip.

    If you plot the number of floors versus the average speed it will be a curve because the acceleration & deceleration will be less of a factor on longer trips.

    The asymptote of the curve will be the actual speed.

    Individual trip speed just requires a small time (about equal to the accel & decel  time/2) subtracted from the trip time before dividing distance by time to get speed.

    A Bluetooth arduino is more than adequate for this task. It would need an accelerometer to detect the stop at each floor.

    If you know the distance it travels at constant speed, the accelerometer can tell when the speed is constant, so the distance divided by the time it spends at constant speed is the speed.

  • Thank you everyone for the input! wow.

    I don't know if the following information would be helpful but:

    You can do a pretty decent calculation of travel distance on most elevators (there are exceptions that one would have to measure)

    And the Acceleration and deceleration distances are usually consistent. 18-26 inches. Because these numbers are rough I know it would not give extremely accurate information.

    I never considered the barometric pressure option. I will have to look into that a bit more. I had considered this idea for a unit would also be useful for diy rocket and NEO balloon projects.

    Thank you again for everyone that gave their time and thoughts to this.