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Thread: Automatic Window Help

  1. #1
    Associate Engineer
    Join Date
    Jan 2018

    Automatic Window Help

    Hi guys,
    I am currently in college and have to complete a project. For this project, i have decided to create an automatic window opener, based on internal temperature and rain conditions. The window this will be installed on is a top hinged window and about a metre wide.
    After some research of existing methods, i have found this design on thingiverse:

    I really like this idea and would like to base my design on it, however i think that my window will be much more difficult to open than the one in the video, and am worried that the motor won't be powerful enough.
    I also want to use a raspberry pi to control the mechanism, and so the motor will need to be compatible with it.
    I don't know anything about controlling motors with raspberry pi's, however from research, i have found that i can use a L293D board to control a motor up to 2A.
    It would also be preferable if the motor was relatively cheap, as i am paying for it myself.

    I have found this motor which i think might be powerful enough on RS Components which i think might work:

    I can also move the mechanism from the hinge side to the opening side, to make it easier to open, as well as using one mechanism on each side.

    Therefore, i was wondering if any of you have an advice on what motor i can use, how i could alter the design to make it more powerful, or anything else you might know.
    Sorry if this is in the wrong place or the question i am asking is obvious, but i am still in college and quite stuck.


  2. #2
    Principle Engineer
    Join Date
    May 2015
    Start by looking at the low cost solutions that are on the market:

    It only has temperature control but get creative on the rain closure by making it automatic as well. Or design it as rain proof from the start with a bottom vented cover.

  3. #3
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Bold Springs, GA
    To determine the force required of your motor, sum the mass of all components being lifted and apply a frictional force to each contact surface(s) within the mechanism(s).

    Apply a factor of safety (FOS) that seems reasonable (1.4?).

    When you know the expected axial force applied to the motor, use one of the following equation/calculators to determine the required motor design torque.

    Don't forget that you could include a torque multiplier or gear reduction design as well.
    Tell me and I forget. Teach me and I remember. Involve me and I learn.

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