Day Night Sun Sensor Made of Potentiometer LED LDR No Microcontroller


Introduction: Day Night Sun Sensor Made of Potentiometer LED LDR No Microcontroller

About: I like to get back to the technical roots and try to make things without getting too complicated. Thanks for feedback

This is a tutorial for building a sensor, that indicates day, night and light intensity.

Step 1: Materiallist & Schematics

What you need:

Power Source (USB TTL Module 3,3V OUT)


Jumper Wire

Potentiometer ( to trigger sensibility of dark sensor)

3 X LED in prefered colour


Plug all together as shown in schematics and test it.



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    do you mind explaining how this works? Just intrigued by the LDR in parallel with the LED and how that works

    2 replies

    Hello friend,

    the dark sensor in the middle with LDR and LED works like this:

    When light shines at the LDR, it lets elctricity pass through. So when the Potentiometer is adjusted right, the LDR passes electricity around the LED so it can´t glow. When it´s dark the LDR don´t let the power through so the LED gets enough to glow.

    Thanks, much appreciated. I figured that must have been how it works, just wasn't sure electricity worked that way. I'm obviously still learning the basics of electronics