LDR Using Arduino Mega 2560

Introduction

In this article I will explain about the LDR (Light Dependent Resistor). It will measure the light level using the Arduino Mega 2560.

Parts

• Arduino Mega 2560
• LDR
• LED
• BreadBoard
• Resistor
• Hookup wires

LDR


   Figure 1: LRD

• Light Dependent Resistor (LDR): t will measure the light level.
• It will sense the light level.

Connection

Step 1: Connection From The LDR To Arduinomega2560.

• Take the positive pin connected to the Analog pin of A1 and also connect to the resistor with the positive pin connected with the Gnd.
• The negative pin can be connected to the 5v of the Arduino Mega 2560.

Step 2: Connection From The LED To Arduino Mega 2560

• Postive pin = 11
• Negative pin = Gnd.

Programming

int LDR=A1;
int led=11;
int ldr reading=0;
void setup()
{
  pinMode(led,OUTPUT);
  Serial.begin(9600);
}
void loop()
{
ldr reading=analogRead(LDR);
  if(value < 800)
{
  digitalWrite(led,HIGH);
}
else
{
  digitalWrite(led,LOW);
}
  Serial.println(ldr reading);
  delay(200);
}

Explanation

In this article I have explained about the light measuring level when the light has a low level, or at the high level it will display in the serial monitor.

Output

                                                      Figure 2: Output

 

Read more articles on Internet of Things:

• Getting Familiar With Arduino IDE
• Internet of Things (Basics of IoT)