//In this sketch the brightness of the led goes from 0 to the max  intensity.
//with this sketch you learn about analogWrite

 int led_pin1 = 3; //define variable for the led pin
 int led_pin2 = 0; //define variable for the led pin

void setup() {
  // put your setup code here, to run once:
  pinMode(led_pin1, OUTPUT); //set the led_pin as output
  pinMode(led_pin2, OUTPUT); //set the led_pin as output
}

void loop() {
  // put your main code here, to run repeatedly:
  
  analogWrite(led_pin1, 0); //set the Voltage LOW (ground) and Led turns off
  delay(500); //wait 500millisecond (0.5sec)
  analogWrite(led_pin2, 250); //set the Voltage HIGH and Led turns on.
  
  analogWrite(led_pin1, 50); 
  delay(500); 
  analogWrite(led_pin2, 200);

  analogWrite(led_pin1, 100); 
  delay(500); 
  analogWrite(led_pin2, 150);

  analogWrite(led_pin1, 150); 
  delay(500); 
  analogWrite(led_pin2, 100);

  analogWrite(led_pin1, 200); 
  delay(500); 
  analogWrite(led_pin2, 50);

  analogWrite(led_pin1, 250); 
  delay(500); 
  analogWrite(led_pin2, 0);

  delay(500);
 
  
  

  
}