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Arduino for Kids by Vijay Varada, Rishi Gaurav Bhatnagar, Priya Kuber

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Light sensitivity sensor - LDR

We know how resistor works right? Let's go back to Chapter 3, Components and Connections for a quick recap and come back here. It essentially restricts the flow of electrons in a circuit. Light Depended Resistor is a special kind of resistor that reduces its resistance when light falls on it. How does that work you ask? Good question.

Let's dig a little deeper into what is LDR and how it works. First of all, this is how the symbol of LDR looks like:

  

Light sensitivity sensor - LDR

(Image source: https://cdn.instructables.com/F1H/DRCQ/IDCXJLG6/F1HDRCQIDCXJLG6.MEDIUM.jpg)

Symbol:

The arrow signs coming down show the light falling on the LDR. You ...

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