Arduino Sketch 1

PIR Sensor Input Testing:

LED On/Off depends on PIR sensor's analog input

int ultraSoundSignal = 2; int val = 0;
int ultrasoundValue = 0;
int timecount = 0; int ledPin = 13;
void setup() {
  Serial.begin(9600); // Sets the baud rate to 9600
  pinMode(ledPin, OUTPUT); // Sets the digital pin as output
}

void loop() {
  timecount = 0;
  val = 0;
  pinMode(ultraSoundSignal, OUTPUT); 

  digitalWrite(ultraSoundSignal, LOW); // Send low pulse
  delayMicroseconds(2); // Wait for 2 microseconds
  digitalWrite(ultraSoundSignal, HIGH); // Send high pulse
  delayMicroseconds(5); // Wait for 5 microseconds
  digitalWrite(ultraSoundSignal, LOW); // Holdoff

   pinMode(ultraSoundSignal, INPUT); // Switch signalpin to input
  val = digitalRead(ultraSoundSignal); // Append signal value to val
  while(val == LOW) { // Loop until pin reads a high value
    val = digitalRead(ultraSoundSignal);
  }

  while(val == HIGH) { // Loop until pin reads a low value
    val = digitalRead(ultraSoundSignal);
    timecount = timecount +1; // Count echo pulse time
  }


  ultrasoundValue = timecount; // Append echo pulse time to ultrasoundValue


  if(timecount > 0){
    digitalWrite(ledPin, HIGH);
  }

   delay(100);
}