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Model Railway elevator

Discussion in 'General Electronics Discussion' started by oasis747, Apr 7, 2016.

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  1. oasis747

    oasis747

    1
    0
    Apr 7, 2016
    Hi everyone,

    I'm new to the forum and a bit of a novice but was seeking advice from anyone who can help me with a project.

    I am trying to use a linear actuator to raise and lower a shelf with model trains which is ok as the actuators and up/down remotes are readily available on eBay. The problem arises when I need to be able to control fairly accurately the stopping positions of the levels so the trains can go on and off. I have attached a link from youtube that is basically what I'm trying to achieve but can't find out how to program the actuator to stop at the levels.

    Cheers,

     
  2. Minder

    Minder

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    640
    Apr 24, 2015
    What type of motors are the actuators using?
    The fact it is operating very slowly I believe you may get away with a miniature sensor of some kind, the problem is that your controller is going to have to have some way of programming a certain level.
    You also don't mention detail as to what the system you are using consists of?
    M.
     
  3. Alec_t

    Alec_t

    2,904
    784
    Jul 7, 2015
    Can you source actuators with built-in position-encoders?
     
  4. Bluejets

    Bluejets

    4,277
    909
    Oct 5, 2014
    You could use these slot opto sensors.
    Mount the sensor on a fixed section and a vane on the moving section.
    In the past I have found similar ones from old printers to be repeatedly very precise.(within 1 thou inch on a travelling carriage)
    You will need some interface between these and your motor or whatever, perhaps logic level mosfet would be the easiest.
    Looks like you will need a few to cover the number of "shelves" you need and connect each to a different input on an Arduino.
    The "shelves" appear to be speed controlled also when it comes to the parking position it slows down which is why I suggested the Arduino.Not an easy project for a beginner but plenty of help out there.

    https://www.sparkfun.com/products/10213
     

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    Last edited: Apr 7, 2016
  5. Minder

    Minder

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    640
    Apr 24, 2015
    There is also miniature prox sensors such as Honeywell S400 series, but system details need to be known?
    M.
     
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