Come si usa un rivelatore PIR D203B ?

CIao,

ho comprato 4 rivelatori PIR D203B ma non riesco a farli funzionare.

Nel datasheet ho trovato un circuito di esempio ma non riesco a farlo funzionare credo principalmente perchè non so cosa mettere come amplificatore. Per ora in casa ho un ULN2803A ma non sembra fungere. L'altra differenza tra il mio circuito e quello nel datasheet è che tra G ed S ho messo 5 resistenze da 10KOhm in serie al posto di una da 47KOhm.

Qualcuno saprebbe aiutarmi?

In caso estremo se comprassi questi dovrei poterli usare così come sono senza aggiungere niente?

Magari posta il codice che usi, una foto dei collegamenti della breadboard o uno schema fritzing... sono l'ultimo a poter dare consigli ma sicuramente qualcuno riesce a darti una mano!

Ecco lo schema (il transistor P è il rivelatore PIR e i pin sono a sinistra il Grd al centro Source e a destra il drain ):

http://imageshack.us/photo/my-images/684/pirbb.jpg/

il codice è:

/*

  • //////////////////////////////////////////////////
  • //making sense of the Parallax PIR sensor’s output
  • //////////////////////////////////////////////////
  • Switches a LED according to the state of the sensors output pin.
  • Determines the beginning and end of continuous motion sequences.
  • @author: Kristian Gohlke / krigoo () gmail () com / http://krx.at
  • @date: 3. September 2006
  • kr1 (cleft) 2006
  • released under a creative commons “Attribution-NonCommercial-ShareAlike 2.0” license
  • http://creativecommons.org/licenses/by-nc-sa/2.0/de/
  • The Parallax PIR Sensor is an easy to use digital infrared motion sensor module.
  • (http://www.parallax.com/detail.asp?product_id=555-28027)
  • The sensor’s output pin goes to HIGH if motion is present.
  • However, even if motion is present it goes to LOW from time to time,
  • which might give the impression no motion is present.
  • This program deals with this issue by ignoring LOW-phases shorter than a given time,
  • assuming continuous motion is present during these phases.

*/

/////////////////////////////
//VARS
//the time we give the sensor to calibrate (10-60 secs according to the datasheet)
int calibrationTime = 30;

//the time when the sensor outputs a low impulse
long unsigned int lowIn;

//the amount of milliseconds the sensor has to be low
//before we assume all motion has stopped
long unsigned int pause = 5000;

boolean lockLow = true;
boolean takeLowTime;

int pirPin = 10; //the digital pin connected to the PIR sensor’s output
int ledPin = 11;

/////////////////////////////
//SETUP
void setup(){
Serial.begin(9600);
pinMode(pirPin, INPUT);
pinMode(ledPin, OUTPUT);
digitalWrite(pirPin, LOW);

//give the sensor some time to calibrate
Serial.print(“calibrating sensor “);
for(int i = 0; i < calibrationTime; i++){
Serial.print(”.”);
delay(1000);
}
Serial.println(" done");
Serial.println(“SENSOR ACTIVE”);
delay(50);
}

////////////////////////////
//LOOP
void loop(){

if(digitalRead(pirPin) == HIGH){
digitalWrite(ledPin, HIGH); //the led visualizes the sensors output pin state
if(lockLow){
//makes sure we wait for a transition to LOW before any further output is made:
lockLow = false;
Serial.println("—");
Serial.print(“motion detected at “);
Serial.print(millis()/1000);
Serial.println(” sec”);
delay(50);
}
takeLowTime = true;
}

if(digitalRead(pirPin) == LOW){
digitalWrite(ledPin, LOW); //the led visualizes the sensors output pin state

if(takeLowTime){
lowIn = millis(); //save the time of the transition from high to LOW
takeLowTime = false; //make sure this is only done at the start of a LOW phase
}
//if the sensor is low for more than the given pause,
//we assume that no more motion is going to happen
if(!lockLow && millis() - lowIn > pause){
//makes sure this block of code is only executed again after
//a new motion sequence has been detected
lockLow = true;
Serial.print(“motion ended at “); //output
Serial.print((millis() - pause)/1000);
Serial.println(” sec”);
delay(50);
}
}
}

Vedi se questo può esserti utile... http://www.ladyada.net/learn/sensors/pir.html