HC-SR505 passive infrared (PIR) motion sensor

/*
The HC-SR505 is a passive infrared (PIR) motion sensor that detects motion in its field of view. Here's an example code in Arduino that reads the motion detection status from the sensor:

Note: This code assumes that the HC-SR505 PIR motion sensor is connected to pin 2 of the Arduino board. If you're using a different pin, you'll need to modify the SENSOR_PIN definition accordingly. Also, note that the HC-SR505 is a digital sensor that outputs a high signal when motion is detected and a low signal when no motion is detected, so it can be read directly using the digitalRead() function. Finally, note that the HC-SR505 has a limited detection range and may not detect motion outside of its field of view.
*/


const int SENSOR_PIN = 2;  // the pin connected to the sensor
int motion_detected = 0;  // 1 if motion detected, 0 otherwise

void setup() {
  Serial.begin(9600);

  pinMode(SENSOR_PIN, INPUT);
}

void loop() {
  // read the motion detection status from the sensor
  motion_detected = digitalRead(SENSOR_PIN);

  // print the motion detection status
  if (motion_detected) {
    Serial.println("Motion Detected");
  } else {
    Serial.println("No Motion Detected");
  }

  // delay before reading from the sensor again
  delay(1000);
}