Light & Dark Detecting Circuit Using Arduino UNO

In this instructable, i will show how to make a Light and Dark Detecting circuit using Arduino UNO with a single circuit just by changing simple sketch or program

Video

Arduino Tutorial 12 | Light &amp; Dark Detecting Circuit Using LDR &amp; Arduino

You can watch the video to see how it works or continue reading to try it yourself

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Things Required

1. Arduino UNO

2. LDR

3. 470 Ohm Resistor

4. 1k Resistor

5. Bread Board

6. Jumper Wires

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Circuit Diagram

Construction

Connect the circuit according to the circuit diagram as shown in the previous step

Sketch or Program

How LDR works ?

The resistance of a photo resistor or LDR decreases with increasing incident light intensity. Which means as the light intensity increases the resistance decreases & vice versa.

So this logic is considered in the sketch

In the sketch we compare the default set value which is defined as BRIGHTNESS in the sketch and compare it to the output of the LDR

DARK DETECTION
To detect the dark we compare the default value to the LDR value. IF the value of the LDR is less then the default value, the GREEN LED glows which means its dark

LIGHT DETECTION

To detect the dark we compare the default value to the LDR value. IF the value of the LDR is greater then the default value, the GREEN LED glows which means its day/light

Dark Detection

In the pictures you can see how the circuit works.

DARK DETECTION
To detect the dark we compare the default value to the LDR value. IF the value of the LDR is less then the default value, the GREEN LED glows which means its dark.

To watch testing CLICK HERE

Testing begins @ 1:56

Downloads

Dark_Detection.ino

Changing the Code From Dark to Light Detecting Circuit

Above circuit shows the change in the circuit to be made to convert it to Light detecting from the dark detecting circuit

Light Detection

In the pictures you can see how the circuit works.

LIGHT DETECTION

To detect the dark we compare the default value to the LDR value. IF the value of the LDR is greater then the default value, the GREEN LED glows which means its day/light

To watch the testing Click Here

Testing begins @ 3:06

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Software Download Link:

Arduino Software : www.arduino.cc