How to Use a Photoresistor!

Learn how to use a photoresistor in a matter of minutes!

Mar 11, 2022

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2 respects

environmental sensing

sensors

photoresistor

Components and supplies

LED (generic)

Jumper wires (generic)

Arduino UNO

Resistor 10k ohm

Photo resistor

Breadboard (generic)

Apps and platforms

Arduino IDE

Project description

Code

sketch_mar11a.ino

arduino

This code basically checks if electricity is running through the photoresistor, and if there is, it should turn on the LED.

1int ledPin = 2;
2
3void setup() {
4    Serial.begin(9600);
5    pinMode(ledPin,  OUTPUT);
6}
7
8void loop() {
9    int value = analogRead(A0);
10
11    Serial.println("Analog  Value: ");
12    Serial.println(value);
13    
14    if (value > 450) {
15        digitalWrite(ledPin, LOW);
16    } else {
17        digitalWrite(ledPin,  HIGH);
18    }
19    
20    delay(250);
21}
22

int ledPin = 2;

void setup() {
    Serial.begin(9600);
    pinMode(ledPin,  OUTPUT);
}

void loop() {
    int value = analogRead(A0);

    Serial.println("Analog  Value: ");
    Serial.println(value);
    
    if (value > 450) {
        digitalWrite(ledPin, LOW);
    } else {
        digitalWrite(ledPin,  HIGH);
    }
    
    delay(250);
}

Downloadable files

Circuit Diagram

Wire up your circuits like this, and you should be good to go.

Circuit Diagram

Wire up your circuits like this, and you should be good to go.

Circuit Diagram

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tropicalbean

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