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digital signal processing using ardunio

Today i'm going to explain,How to control any electronics equipment by switch using Arduino.
for these we need some hardware which are mentioned below
 1> Computer
 2> Cable
 3> Arduino
 4> Switch
 5> Resistor
This project is based on the reading of the digital signal.Write  the code shown below to your Arduino ide software in your computer,the connect the Arduino to your PC & upload the program to your arduino by using the botton in your ide.


 code :-
int led=12;//input pin of led
int signal=7;//input pin of signal via switch

 void setup() {
  pinMode(led,OUTPUT);//declare the led is for output
  pinMode(signal,INPUT);//declare the signal as input
  }
void loop() {
 int val=digitalRead(signal);//measure input signal value 
if (val==1)//if measure value is equal to 1
digitalWrite(led,HIGH);//led pin is on
else 
digitalWrite(led,LOW); //led is off
}
connect one pin of switch to the ground(GND) and another pin to the port no 7 of arduino.
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