Photoresistor Module KY-018

Here's a step-by-step tutorial on how to connect a photoresistor module (KY-018) to an Arduino:

Step 1: Gather the Required Equipment:

• Arduino board (such as Arduino Uno)
• Photoresistor module (KY-018)
• Resistor (usually 10k Ohms)
• Breadboard
• Jumper wires

Step 2: Understand the Photoresistor Module:

• The photoresistor module is a type of light sensor that changes its resistance based on the intensity of light falling on it.
• It usually has three pins: VCC (power supply), GND (ground), and OUT (output).
• The VCC pin is used to provide power to the module (typically 5V).
• The GND pin is connected to the ground of the Arduino.
• The OUT pin is the output pin that provides an analog voltage signal to the Arduino proportional to the intensity of light falling on the photoresistor.

Step 3: Connect the Photoresistor Module to the Breadboard:

• Insert the photoresistor module into the breadboard so that its pins are on separate rows.
• Connect the VCC pin of the photoresistor module to the 5V pin on the Arduino board using a jumper wire.
• Connect the GND pin of the photoresistor module to the GND pin on the Arduino board using a jumper wire.
• Connect one leg of the resistor to the OUT pin of the photoresistor module and the other leg of the resistor to any analog pin on the Arduino board, such as A0, using a jumper wire.

Step 4: Read the Photoresistor Module's Analog Output:

• Open the Arduino IDE software on your computer and create a new sketch.
• Copy and paste the following code into the sketch:

int photoresistorPin = A0; // Pin number to which the resistor is connected

void setup() {
  Serial.begin(9600); // Start serial communication
}

void loop() {
  int photoresistorValue = analogRead(photoresistorPin); // Read the analog value from the photoresistor
  Serial.println(photoresistorValue); // Print the analog value to the serial monitor
  delay(500); // Delay for stability
}

• Verify and upload the code to your Arduino board.
• Open the Serial Monitor in the Arduino IDE to view the analog output of the photoresistor module.
• Observe the readings changing in the serial monitor as you vary the intensity of light falling on the photoresistor.

That's it! You have successfully connected a photoresistor module (KY-018) to an Arduino and read its analog output. You can now use the analog readings to trigger actions in your Arduino project based on the intensity of light detected by the photoresistor.