COMBINED SENSORS OF ULTRASONIC ,PIR AND TEMPERATURE SENSOR

 

int analogpin = A0;

int pr = 13;

int val = 0;

#define echo 7

#define trig 8

long duration;

int distance;

void setup() {

  pinMode(analogpin, INPUT);

  pinMode(pr, INPUT);

  pinMode(echo, INPUT);

  pinMode(trig, OUTPUT);

  pinMode(2,OUTPUT);

  pinMode(3,OUTPUT);

  pinMode(4,OUTPUT);

 // Assuming pin 2 is used for output in the condition

  Serial.begin(9600);

}

void loop() {

  int adc = analogRead(analogpin);

  float voltage = (adc * 5.0) / 1024.0; // Correct voltage calculation

  float temperatureC = (voltage-0.5) * 100.0; // Adjusted calculation assuming TMP36 sensor

  Serial.println("Temperature Recorded:");

  Serial.print(temperatureC);

  Serial.println(" C");

  val = digitalRead(2);

  

  // Trigger the ultrasonic pulse

  digitalWrite(trig, LOW);

  delayMicroseconds(2);

  digitalWrite(trig, HIGH);

  delayMicroseconds(10);

  digitalWrite(trig, LOW);

  // Measure the duration of the echo

  duration = pulseIn(echo, HIGH);

  

  // Calculate the distance based on duration

  distance = duration * 0.034 / 2.0;

  Serial.println("Distance measured in cm:");

  Serial.println(distance);

  int pir=digitalRead(13);

  

  // Corrected if condition

 if((temperatureC>20 && temperatureC<=30) && (distance>10 && distance<=20) && (pir==HIGH) )

 {

   Serial.println("VALUE MEASURED - 1");

   Serial.print(1);

   digitalWrite(4,HIGH);

   digitalWrite(2,LOW);

   digitalWrite(3,LOW);

 }

 else if((temperatureC>30 && temperatureC<=40) && (distance>20 && distance<=30)&& (pir==HIGH))

 {

   Serial.println("VALUE MEASURED - 2");

   Serial.print(2);

   digitalWrite(3,HIGH);

   digitalWrite(4,LOW);

 }

  else if((temperatureC>50 && temperatureC<=80) && (distance>50 && distance<=100)&& (pir==HIGH))

 {

   Serial.println("VALUE MEASURED - 3");

   Serial.print(3);

   digitalWrite(2,HIGH);

    digitalWrite(4,LOW);

      digitalWrite(3,LOW);

 }

  delay(1000); // Adding a delay for readability and stability

}