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Lesson 11: Photoresistor Module

In this lesson, you will learn how to use a photoresistance sensor with an ESP32 Development Board to measure light intensity. We’ll explore how the sensor detects different light levels and processes and displays these readings on the serial monitor. This project is ideal for beginners as it provides hands-on experience with analog sensors and real-time data handling in Arduino programming.

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
ESP32 & Development Board (ESP32 Board)	BUY
Photoresistor Module	BUY
Breadboard	BUY

Wiring

Code

Code Analysis

1. 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 pin 25.

   const int sensorPin = 25;  // Pin connected to the photoresistor
   
   void setup() {
     Serial.begin(9600);  // Start serial communication at 9600 baud rate
   }
   

2. 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
   }