#define LED_PIN3 3
#define LED_PIN4 4
#define LED_PIN5 5
#define LED_PIN6 6
#define LED_PIN7 7
#define LED_PIN8 8
void setup() {
    pinMode(LED_PIN3, OUTPUT);
    pinMode(LED_PIN4, OUTPUT);
    pinMode(LED_PIN5, OUTPUT);
    pinMode(LED_PIN6, OUTPUT);
    pinMode(LED_PIN7, OUTPUT);
    pinMode(LED_PIN8, OUTPUT);
}

void loop() {
	for(int i=0;i<=255;i++) {
	analogWrite(LED_PIN3, i);
	delay(5);
   }


	for(int i=255;i>=0;i--) {
	analogWrite(LED_PIN3, i);
	delay(5);
   }
	for(int i=0;i<=255;i++) {
	analogWrite(LED_PIN3, i);
	delay(5);
   }


	for(int i=255;i>=0;i--) {
	analogWrite(LED_PIN4, i);
	delay(5);
   }
   	for(int i=0;i<=255;i++) {
	analogWrite(LED_PIN4, i);
	delay(5);
   }


	for(int i=255;i>=0;i--) {
	analogWrite(LED_PIN5, i);
	delay(5);
   }
   	for(int i=0;i<=255;i++) {
	analogWrite(LED_PIN5, i);
	delay(5);
   }


	for(int i=255;i>=0;i--) {
	analogWrite(LED_PIN6, i);
	delay(5);
   }
   	for(int i=0;i<=255;i++) {
	analogWrite(LED_PIN6, i);
	delay(5);
   }


	for(int i=255;i>=0;i--) {
	analogWrite(LED_PIN7, i);
	delay(5);
   }
   	for(int i=0;i<=255;i++) {
	analogWrite(LED_PIN7, i);
	delay(5);
   }


	for(int i=255;i>=0;i--) {
	analogWrite(LED_PIN8, i);
	delay(5);
   }
   	for(int i=0;i<=255;i++) {
	analogWrite(LED_PIN8, i);
	delay(5);
    }
}