//*********************************
//Visual and auditory alarm system
///********************************

//PIR sensor + LED + Buzzer                          
//José Manuel Díaz - Fab Academy 2022
//JOSAMD 1.0
//SAMD11C

//Original code by Luis Llamas.
//Update 2020 - Fab Academy 2020 - Fab Lab León by Adrian Torres 

const int LEDPin = 2;        // for LED
const int PIRPin = 5;         // for PIR sensor
const int BuzzerPin = 4;         // for Buzzer
 
int pirState = LOW;           // start there is no movement
int val = 0;                  // pin status
 
void setup() 
{
   pinMode(LEDPin, OUTPUT); 
   pinMode(PIRPin, INPUT);
   pinMode(BuzzerPin, OUTPUT);
   Serial.begin(115200);
   delay(2000);
}
 
void loop()
{
  delay(300);
   val = digitalRead(PIRPin);
   if (val == HIGH)   //if activated
   { 
      digitalWrite(LEDPin, HIGH);  //LED ON
      analogWrite(BuzzerPin, 250);
      delay(200);
         digitalWrite(LEDPin, LOW);  //LED OFF
         analogWrite(BuzzerPin, 150);
      delay(200);
         digitalWrite(LEDPin, HIGH);  //LED ON
          analogWrite(BuzzerPin, 250);
      delay(200);
         digitalWrite(LEDPin, LOW);  //LED OFF
          analogWrite(BuzzerPin, 150);
      delay(00);
      
      if (pirState == LOW)  
      {
        Serial.println("Alarm activated");
        pirState = HIGH;
      }
   } 
   else   //is not activated
   {
      digitalWrite(LEDPin, LOW); // LED OFF
      analogWrite(BuzzerPin, LOW);
      if (pirState == HIGH)  //si
      {
        Serial.println("Inactive alarm");
        pirState = LOW;
        delay(200);
      }
   }
}