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arduino_home_security_with_pir_sensor_and_lcd_display1.ino

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+// source https://www.arduino.cc/en/Tutorial/LiquidCrystalAutoscroll
+
+// library for the LCD display:
+// source http://www.instructables.com/id/Home-Security-Alarm-or-a-Motion-Detector-Using-Ard/
+// Source photo cell https://learn.adafruit.com/photocells/using-a-photocell
+
+// library for the LCD display:
+#include <LiquidCrystal.h>
+
+int ledPin = 11;               
+int PIRpin = 8;            
+int pirState = LOW;            
+int val = 0;                    
+// photocell circuit
+int photocellPin = A0;     // the cell and 10K pulldown are connected to a0
+int photocellReading;     // the analog reading from the sensor divider         
+
+LiquidCrystal lcd(2, 3, 4, 5, 6, 7);                        
+
+
+void setup() {  
+
+  pinMode(ledPin, OUTPUT);       
+  pinMode(PIRpin, INPUT);     
+  pinMode(photocellPin, INPUT);
+
+  Serial.begin(9600);
+  lcd.begin(16, 2); 
+  lcd.setCursor(2, 0);                   	// Set LCD cursor position (column, row)
+  lcd.print("P.I.R Motion ");               // Print text to LCD
+  lcd.setCursor(0, 1);                      // Set LCD cursor position (column,row) 
+  lcd.print("and Light Sensors");           // Print text to LCD
+  delay(2000); // wait 2s                   // Delay to read text
+
+	delay(2000);                            // Delay to read text
+	lcd.clear();                            // Clear LCD    
+	lcd.setCursor(0, 0); 
+    lcd.print("Processing Data.");
+    delay(3000);
+    lcd.clear(); 
+	lcd.setCursor(3, 0);                 	// Set LCD cursor position (column 0, row 0)
+	lcd.print("No Motion ");   
+	lcd.setCursor(3, 1); 
+	lcd.print("Waiting !");	
+
+}
+
+void loop(){
+  val = digitalRead(PIRpin);  
+  photocellReading = analogRead(photocellPin);
+
+  if (val == HIGH) {            // check if the input is HIGH
+    digitalWrite(ledPin, HIGH);  // turn LED ON
+    delay(150);
+
+		if (pirState == LOW) {
+		  Serial.println("Motion detected!");
+		  lcd.clear() ;
+		  lcd.setCursor(0, 0);                 // Set LCD cursor position (column 0, row 0)
+		  lcd.print("Motion Detected!");   
+		  lcd.setCursor(0, 1);                 // Set LCD cursor position (column 0, row 1)
+		  lcd.print(photocellReading);		  
+		  // We only want to print on the output change, not state
+		  pirState = HIGH;
+          delay(5000) ;
+		}
+  } else {
+      digitalWrite(ledPin, LOW); // turn LED OFF
+
+	  // display no motion screen saver
+	  scrollScreenSaver() ;
+      if (pirState == HIGH){
+		  // There's no motion !
+
+		  // change to no motion detected
+		  pirState = LOW;
+      }
+  }
+}
+
+void scrollScreenSaver() {
+
+	// autoscroll https://www.arduino.cc/en/Tutorial/LiquidCrystalAutoscroll
+	lcd.clear() ;
+  	lcd.setCursor(15, 0);                 // Set LCD cursor position (column 0, row 0)
+	lcd.print("No Motion ");   
+	lcd.setCursor(15, 1); 
+	lcd.print("Waiting !");	
+	// scroll 7 positions (display length - string length) to the left
+	// to move it back to center:
+
+    for (int positionCounter = 0; positionCounter < 22; positionCounter++) {
+		// scroll one position left:
+		lcd.scrollDisplayLeft();
+		// wait a bit:
+		delay(150);
+
+	}
+}