Using a LDR with Arduino

To know about LDR check wikipedia

http://en.wikipedia.org/wiki/Light-emitting_diode

The sketch of the above schemetic is based on LED blinking code,but instead of using a fixed delay the rate is determined by the light sensitive sensor called LDR.

So now the following sketch will help you how to read the value of the LDR based on the sensitivity of light.

// Sketch to get the input from the LDR

int inputLDR=A0;
void setup()
{
  pinMode(inputLDR,INPUT);
 Serial.begin(9600);  // starts a serial connection with your computer to display the input of LDR with Baud rate of 9600
}
void loop()
{
   int a;    // to store the values which we received from the LDR
   a=analogRead(inputLDR); // Gets input from the LDR
   Serial.println(a);
}

 

Blinking an External LED with an Arduino



The above Schematic will guide you on how an External LED must be interfaced with an Arduino.
In the above case Two LED's red and yellow are connected.

you can use the same blink code which i have given in the previous  post.Instead of using the pin number as 13 you can use the pin 9 and 10;
Any range of resistors between 1K and 10k can be used .

Code to use the above Schematic for blink as well as fading the LED's

int redled=9;
int yellowled=10;
void Setup()
{
   pinMode(redled,OUTPUT);
   pinMode(yellowled,OUTPUT);
}
void loop()
{
// For the blink of both the led

digitalWrite(redled,HIGH);
digitalWrite(yellowled,HIGH);
delay(1000);
digitalWrite(redled,LOW);
digitalWrite(yellowled,LOW);
delay(1000);

// For fading the LED

for(int i=0;i<250;i++)
{
 analogWrite(redled,i);
 analogWrite(yellowled,i);
 }
for(int i=250;i<0;i--)
{
 analogWrite(redled,i);
 analogWrite(yellowled,i);
 }


}//end of loop


Comment either use of code to test the fading and blink

Blink code in Arduino ( Blink LED ON and OFF using Arduino)

/*

  Blink

  Turns on an LED on for one second, then off for one second, repeatedly.

 

  This example code is in the public domain.

 */

 

// Pin 13 has an LED connected on most Arduino boards.

// give it a name:

int led = 13;

// the setup routine runs once when you press reset:

void setup() {                

  // initialize the digital pin as an output.

  pinMode(led, OUTPUT);     

}

// the loop routine runs over and over again forever:

void loop() {

  digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)

  delay(1000);               // wait for a second

  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW

  delay(1000);               // wait for a second

}

The following code is available by default in Arduino in File---->Examples---->basics----->blink

Working of the code

The pin 13 avail in the Arduino UNO has a On-board LED with a internal resistance with it .

so in order to activate the internal resistance the code " pinMode(led,OUTPUT) "(in void setup) is used.

The variable led is initialized with 13 and the pin 13 is said to be a output.

So the resistance of the on board LED is activated.

Now in void loop()  the code

digitalWrite(led, HIGH);   // turn the LED on (HIGH is the voltage level)

 

supplies 5v(ie Vcc) to the LED and hence it glows up..!! :D

now it has a delay(1000) which waits for one second and again it switches off the LED and waits for 1 sec.

This process repeats for ever in void loop()..!!

Getting Started with Arduino

The Arduino environment has been designed to be esy to use for beginners who have no software or electronics Xp's unlike me..!!With Arduino you can build objects that can respond to and/or control lights,sound,touch and movement..(What else do you probably need???)

So you can use Arduino to create your own musical instruments,Robots,light sculptures,games,interactive furniture and even interactive clothing .

Arduino is used in many educational programs around the world,particularly by designers and artists who want ot easily create prototypes but do not need a deep understanding of the technical detailes behind their creations.Because it is designed to be used by non-tech people the software includes plenty of example code to demonstrate how to use the Arduino board .

Arduino Software

Software programs called sketches are created on a computer using the Arduino IDE . The IDE enables you to write and edit code and convert this code into instructions that Arduino hardware understands.The IDE also transfers those instructions to the Arduino board.

Arduino Hardware Spec

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