sensore_PIR

introduction

PIR stands for Passive InfraRed sensor. Detects the minimum of infrared heat emanating from a person or an object. The PIR stores as normal all that does not change around him. The wall of a room in front of him does not change temperature (only very slowly from day to night) and then records it as normal. A person who passes in front emits heat, the PIR registers this immediate change.

We build an alarm, an audible beep and an LED that flashes when someone approaches

program

apri il programma

Arduino

inizia il laboratorio

algorithm

attrezzaggio

pin13

_red_led

pin0

_altoparlante

pinA0

_sensor_PIR

variabili

X = 0

ciclo

the variable X is equal to... read the sensor: _sensor_PIR

write on the serial: valore di... X

IF HAPPENS THAT X is greater than 100

SWITCH ON (5 Volt) switch on

_red_led

PLAY the note C central (262Hz) duration: 500 milliseconds

wait 1000 milliseconds

SWITCH OFF (0 Volt) switch off

_red_led

PLAY the note 3 G (392Hz) duration: 500 milliseconds

wait 1000 milliseconds

Arduino code

//programma: sensore_PIR

//******* pin ********

//******* declare ******** 
const int pin_red_led=13;//pin of _red_led
const int pin_altoparlante=0;//the longer leg is the positive and goes to pin, the other to GND
const int pin_sensor_PIR=A0;//pin sensorgenericosensore
int X=0;//declares the variable

//********** setup **********  
   void setup(){ 
	
	pinMode(pin_red_led,OUTPUT);  
	pinMode(pin_altoparlante,OUTPUT); 
	pinMode(pin_sensor_PIR,INPUT); 
	 Serial.begin(9600);      // Initialize the serial  
}

//********** loop ********** 
 void loop() { 
	
	X=analogRead(pin_sensor_PIR); // reads the sensor _sensor_PIR
	Serial.print("valore di...");//writes on the serial 
	Serial.println(X);//writes on the serial 
	if(X>100){ 
	digitalWrite(pin_red_led,HIGH); // HIGH/LOW is the voltage 5V/0V)
	tone(pin_altoparlante,262,500);   
	delay(1000);//attendi 
	digitalWrite(pin_red_led,LOW); // HIGH/LOW is the voltage 5V/0V)
	tone(pin_altoparlante,392,500);   
	delay(1000);//attendi 
		}

};//end loop

//powered by "Arduinomio" (C) 
//www.mastrohora.it

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