/*
   PIR sensor tester with 3 LEDs (sequential)
*/

int ledPinA = 13;  // choose the pin for LED A
int ledPinB = 12;  // choose the pin for LED B
int ledPinC = 11;  // choose the pin for LED C
int inputPin = 2;  // choose the input pin (for PIR sensor)
int pirState = LOW;  // we start, assuming no motion detected
int val = 0;  // variable for reading the pin status

void setup() {
  pinMode(ledPinA, OUTPUT);  // declare LED A as output
  pinMode(ledPinB, OUTPUT);  // declare LED B as output
  pinMode(ledPinC, OUTPUT);  // declare LED C as output
  pinMode(inputPin, INPUT);  // declare sensor as input

  Serial.begin(9600);
}

void loop() {
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {  // check if the input is HIGH
    digitalWrite(ledPinA, HIGH);  // turn LED A ON
    delay(500); // wait for a while
    digitalWrite(ledPinA, LOW);   // turn LED A OFF
    delay(100); // brief pause before next LED
    digitalWrite(ledPinB, HIGH);  // turn LED B ON
    delay(500); // wait for a while
    digitalWrite(ledPinB, LOW);   // turn LED B OFF
    delay(100); // brief pause before next LED
    digitalWrite(ledPinC, HIGH);  // turn LED C ON
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
    delay(1000); // time for LED C to remain ON
    digitalWrite(ledPinC, LOW);   // turn LED C OFF
  } else {
    if (pirState == HIGH) {
      // we have just turned off
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}