HC-SR501 PIR Sensor

exempel

1. /* Example code for HC-SR501 PIR motion sensor with Arduino. More info: www.makerguides.com */
3. // Define connection pins:
4. #define pirPin 2
5. #define ledPin 13
7. // Create variables:
8. int val = 0;
9. bool motionState = false; // We start with no motion detected.
11. void setup() {
12. // Configure the pins as input or output:
13. pinMode(ledPin, OUTPUT);
14. pinMode(pirPin, INPUT);
16. // Begin serial communication at a baud rate of 9600:
17. Serial.begin(9600);
18. }
20. void loop() {
21. // Read out the pirPin and store as val:
22. val = digitalRead(pirPin);
24. // If motion is detected (pirPin = HIGH), do the following:
25. if (val == HIGH) {
26. digitalWrite(ledPin, HIGH); // Turn on the on-board LED.
28. // Change the motion state to true (motion detected):
29. if (motionState == false) {
30. Serial.println(“Motion detected!”);
31. motionState = true;
32. }
33. }
35. // If no motion is detected (pirPin = LOW), do the following:
36. else {
37. digitalWrite(ledPin, LOW); // Turn off the on-board LED.
39. // Change the motion state to false (no motion):
40. if (motionState == true) {
41. Serial.println(“Motion ended!”);
42. motionState = false;