ePIR arduino sample code

epir.arduino

  #include <SoftwareSerial.h>
  
  // This is the input and output of the ePIR
  #define rxPin 3
  #define txPin 2
  
  // we will switch on and off the onboard led.
  #define onBoardLed 13
  
  // set up a new serial port
  SoftwareSerial ePir = SoftwareSerial(rxPin, txPin);
  
  // Reads a character and return it
  static char getCh() {
   while(!ePir.available())
     ;
    blink();
   return ePir.read(); 
  }
  
  int up=0;
  
  void blink() {
    if(up%5 ==0 ) {
      digitalWrite(onBoardLed, HIGH); 
    } else {
      digitalWrite(onBoardLed, LOW); 
    }
    up = up + 1;
  }
  
  void plint(String what) {
    ePir.print(what);
    blink();
  }
  
  void setup()  {
    // set the data rate for the SoftwareSerial port
    Serial.begin(9600);
    Serial.println("\n[EPIR]");
    
    // ePIR communicates at 9600. This is important.
    ePir.begin(9600);
    // Initialize onboard LED
    pinMode(onBoardLed, OUTPUT);
  }
  
  void loop() {
    // Get Proximity detection status
    plint("a");
    Serial.print(getCh());
    // Get proximity value
    plint("b");
    Serial.println(getCh(), DEC);
    delay(1000);
  }