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Stair Light/Motion Sensor

Discussion in 'Sensors and Actuators' started by Sarah Szabo, Feb 27, 2019.

  1. Sarah Szabo

    Sarah Szabo

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    Dec 27, 2017
    I'm looking to build a simple circuit that triggers a red LED strip to light stairs at night since my mom has trouble going down the stairs.

    A PIR sensor such as (https://www.amazon.com/Sensky-Funct...lt+pir+sensor&qid=1551215394&s=gateway&sr=8-6) wouldn't be ideal since it would also light up during the day whenever there was motion.

    What component am I looking for? Are there units that are sensitive to ambient light conditions as well as motion conditions that run off of 24V (The voltage I've chosen for the project) and have some kind of timer for staying on for a few seconds to make it down the stairs?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Wouldn't hurt anyway.

    You could put the pir sensor in series with a timer similar to this one. The pir sensor and LED lights would then be activated during night hours only.

    I'm not aware of an off the shelf timer/sensor combo.
     
    davenn likes this.
  3. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    I do not see a daytime/nighttime feature on the first one.
    The second one looks promising though. Nice find.
     
  4. davenn

    davenn Moderator

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    Sep 5, 2009

    they look pretty much identical
    and same/similar features
     
  5. Bluejets

    Bluejets

    3,422
    690
    Oct 5, 2014
    Giveaway is the moon symbol. (Lux) This pot adjusts whether pir works in daytime as well as nightime.
    i.e. screw it around to the moon and it only works at night.

    Fairly rough adjustments though ( log rather than linear) so have to fiddle a bit.
    220-240v ac ones are the same.
     
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