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//******* pin ******** 
const int pin_ledrosso1=1;//pin del _ledrosso1
const int pin_ledrosso2=2;//pin del _ledrosso2
const int pin_ledrosso3=3;//pin del _ledrosso3
const int pin_sensore_luce=A0;//luce

//******* dichiarazioni ******** 
int A=0;//

//********** setup **********  
   void setup(){ 
	
	pinMode(pin_ledrosso1,OUTPUT);// 
	pinMode(pin_ledrosso2,OUTPUT);// 
	pinMode(pin_ledrosso3,OUTPUT);// 
	pinMode(pin_sensore_luce,INPUT);// 
}

//********** ciclo ********** 
 void loop() { 
	
	A=analogRead(pin_sensore_luce); // Legge il valore da _sensore_luce
	if(A<80){ 
	digitalWrite(pin_ledrosso1,HIGH); // 
	digitalWrite(pin_ledrosso2,LOW); // 
	digitalWrite(pin_ledrosso3,LOW); // 
		} 
	if(A>80 && A minore){ 
	digitalWrite(pin_ledrosso1,HIGH); // 
	digitalWrite(pin_ledrosso2,HIGH); // 
	digitalWrite(pin_ledrosso3,LOW); // 
		} 
	if(A>160){ 
	digitalWrite(pin_ledrosso1,HIGH); // 
	digitalWrite(pin_ledrosso2,HIGH); // 
	digitalWrite(pin_ledrosso3,HIGH); // 
		} 
	delay(500);//

};//fine del loop

//codice creato con "Arduinomio" (C) 
//www.mastrohora.it

copy/past on Arduino IDE (here Ctrl+C) (on IDE Ctrl+A+V+U)