งาน arduino 10 Night Security Light

                                                             HARDWARE

SORFWARE

/*
 * Rui Santos 
 * Complete Project Details http://randomnerdtutorials.com
 */
 // Relay pin is controlled with D8. The active wire is connected to Normally Closed and common
int relay = 8;
volatile byte relayState = LOW;
// PIR Motion Sensor is connected to D2.
int PIRInterrupt = 2;
// LDR pin is connected to Analog 0
int LDRPin = A0;
// LDR value is stored on LDR reading
int LDRReading;
// LDR Threshold value
int LDRThreshold = 300;
// Timer Variables
long lastDebounceTime = 0;  long debounceDelay = 10000;
void setup() {
  // Pin for relay module set as output
  pinMode(relay, OUTPUT);
  digitalWrite(relay, HIGH);
  // PIR motion sensor set as an input
  pinMode(PIRInterrupt, INPUT);
  // Triggers detectMotion function on rising mode to turn the relay on, if the condition is met
  attachInterrupt(digitalPinToInterrupt(PIRInterrupt), detectMotion, RISING);
  // Serial communication for debugging purposes
  Serial.begin(9600);
}
void loop() {
  // If 10 seconds have passed, the relay is turned off
  if((millis() - lastDebounceTime) > debounceDelay && relayState == HIGH){
    digitalWrite(relay, HIGH);
    relayState = LOW;
    Serial.println("OFF");
  }
  delay(50);
}
void detectMotion() {
  Serial.println("Motion");
  LDRReading = analogRead(LDRPin);
  // LDR Reading value is printed on serial monitor, useful to get your LDRThreshold
  //Serial.println(LDRReading);
  // Only turns the Relay on if the LDR reading is higher than the LDRThreshold
  if(LDRReading > LDRThreshold){
    if(relayState == LOW){
      digitalWrite(relay, LOW);
    }
    relayState = HIGH;  
    Serial.println("ON");
    lastDebounceTime = millis();
  }
}