LDR

An LDR-sensor is handy to detect light.

Used materials:

• 3 jumper wires.
• Breadboard.
• Arduino-board UNO.
• USB for Arduino.
• LDR sensor.
• 10K resistor.
• Computer or laptop.
• Arduino Editor to import the code (https://create.arduino.cc/editor).

• Connect a wire with input 5V on the Arduino to F6 on the breadboard.
• Connect the second wire with input CND on the Arduino to H13.
• Connect the resistor between H12 and H9 on the same line as the LDR.
• Connect the last wire with input A0 on the Arduino to F9.
• Login on arduino editor to import the code from step 2.
• If you open a new sketch you will see that there is already some code on it, remove that code and copy the code from step 2.
• Paste the code on your empty sketch.

#define LDRpin A0 // pin where we connected the LDR and the resistor

int LDRValue = 0;   // result of reading the analog pin

void setup() {

 Serial.begin(9600); // sets serial port for communication

}

void loop() {

 LDRValue = analogRead(LDRpin); // read the value from the LDR

 Serial.println(LDRValue);   // print the value to the serial port

 delay(100);          // wait a little

}

1. Press the save button
2. Press upload
3. Press on monitor and see the results