// PIR + Ultrasonic Sensor with Arduino

// PIR sensor
int pirPin = 2;      // PIR output connected to digital pin 2
int pirState = LOW;  // Default no motion

// Ultrasonic sensor
int trigPin = 9;     // Ultrasonic trigger pin
int echoPin = 10;    // Ultrasonic echo pin
long duration;
int distance;

void setup() {
  pinMode(pirPin, INPUT);
    pinMode(trigPin, OUTPUT);
      pinMode(echoPin, INPUT);

        Serial.begin(9600);
          Serial.println("PIR + Ultrasonic Sensor Test");
          }

          void loop() {
            // --- PIR SENSOR ---
              pirState = digitalRead(pirPin);

                if (pirState == HIGH) {
                    Serial.println("Motion detected!");
                      } else {
                          Serial.println("No motion");
                            }

                              // --- ULTRASONIC SENSOR ---
                                digitalWrite(trigPin, LOW);
                                  delayMicroseconds(2);

                                    digitalWrite(trigPin, HIGH);
                                      delayMicroseconds(10);
                                        digitalWrite(trigPin, LOW);

                                          duration = pulseIn(echoPin, HIGH);
                                            distance = duration * 0.034 / 2; // Convert to cm

                                              Serial.print("Distance: ");
                                                Serial.print(distance);
                                                  Serial.println(" cm");

                                                    delay(1000); // 1 second delay
                                                    }