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Lesson 11: Photoresistor Module

In this lesson, you will learn how to measure light intensity using a photoresistor sensor with an Arduino Uno. We’ll cover reading and displaying the analog values from the sensor, which reflect the amount of light it detects. This project is ideal for beginners as it provides hands-on experience in working with sensors and understanding analog input on the Arduino platform. You’ll also improve your proficiency in serial communication by outputting sensor readings to the serial monitor.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Arduino UNO R3 or R4	BUY
Photoresistor Module	BUY

Wiring

../_images/Lesson_11_photoresistor_module_uno_bb.png

Code

Code Analysis

Setting Up the Sensor Pin and Serial Communication

We start by defining the sensor pin and initializing serial communication in the setup function. The photoresistor is connected to the analog pin A0.
```
const int sensorPin = A0;  // Pin connected to the photoresistor

void setup() {
  Serial.begin(9600);  // Start serial communication at 9600 baud rate
}
```

Reading and Displaying Sensor Data

In the loop function, we continuously read the analog value from the sensor and print it to the Serial Monitor. We also add a short delay to stabilize the readings.

void loop() {
  Serial.println(analogRead(sensorPin));  // Read and print the analog value
  delay(50);                              // Short delay to stabilize readings
}