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1f239c2 · Aug 21, 2017

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AutomaticWindowBlinds

Automatic Window Blinds Operator

Based on the difference of light intensity between indoors and outdoors, a stepper motor will operate the window blinds.

E.g.: if inside is lighter than outside, the blinds will be closed. If it`s the other way around, they will be opened.

The premise is that a lighter outside environment will reflect light on the windows and the blinds will not necessarily need to be closed, since the interior will not be very visible.

Components

  • 1x 28BYJ-48 Stepper Motor, 5VDC
  • 1x ULN2003A Stepper Motor Driver
  • 2x Photoresistors
  • 2x 10K Resistors

Connections

  • ULN2003A Stepper Motor Driver
    • IN1 -> D8
    • IN2 -> D9
    • IN3 -> D10
    • IN4 -> D11
    • + -> 5V External Power Supply
    • - ->
      • GND External Power Supply
      • GND
    • Stepper Connection -> 28byj-48 Stepper Motor
  • Photoresistor (1)
    • Leg1 -> 5V
    • Leg2 -> A6
    • Leg2 -> 10K R (1) (voltage divider)
    • 10K R (1) -> GND
  • Photoresistor (2)
    • Leg1 -> 5V
    • Leg2 -> A7
    • Leg2 -> 10K R (2) (voltage divider)
    • 10K R (2) -> GND

Photo/Video

  • Video of the first prototype:

    • Video of the first prototype in action
  • Photo of the first prototype from a diferent angle

    • Photo of the first prototype from a diferent angle