main code to operate the garage door sensor

garage_door_sensor.ino

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+#include <Adafruit_NeoPixel.h>
+
+int laserPin = 4;
+int doorsensorpin = 8; // limit switch NC pin
+int doorsensorled = 7; // door open led
+bool havemotion = false;
+int checksaftersafe = 0;
+#define echoPin 3 // attach pin D2 Arduino to pin Echo of HC-SR04
+#define trigPin 2 //attach pin D3 Arduino to pin Trig of HC-SR04
+
+#define LED_PIN     5
+#define NUM_LEDS    7
+Adafruit_NeoPixel pixels(NUM_LEDS, LED_PIN, NEO_GRB + NEO_KHZ800);
+
+// defines variables
+long duration; // variable for the duration of sound wave travel
+int distance; // variable for the distance measurement
+int dooropen; // variable for the limit switch value
+
+void setup() {
+  // put your setup code here, to run once:
+  pinMode(laserPin, OUTPUT);
+  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
+  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT  
+  pinMode(doorsensorpin, INPUT_PULLUP);
+  pinMode(doorsensorled, OUTPUT);
+  pinMode(13, OUTPUT);
+  pixels.begin();  
+  //Serial.begin(9600); 
+  digitalWrite(laserPin,LOW);
+  digitalWrite(doorsensorled,LOW);
+  digitalWrite(13,LOW);
+}
+
+void loop() {
+
+  pixels.clear();
+  pixels.setBrightness(200);
+  
+  // put your main code here, to run repeatedly:
+  // Clears the trigPin condition
+  digitalWrite(trigPin, LOW);
+  delayMicroseconds(2);
+  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
+  digitalWrite(trigPin, HIGH);
+  delayMicroseconds(10);
+  digitalWrite(trigPin, LOW);
+  // Reads the echoPin, returns the sound wave travel time in microseconds
+  duration = pulseIn(echoPin, HIGH);
+  // reads is the door open limit switch
+  dooropen = digitalRead(doorsensorpin);
+  // Calculating the distance
+  distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
+  // Displays the distance on the Serial Monitor
+  Serial.print("Distance: ");
+  Serial.print(distance);
+  Serial.println(" cm");
+  // distance from garage to sensor in most cases is: 46cm (21 inches minus 3 inches for box width)
+  // but we will go with 60... just in case, since initial tests seemed to be a bit off.
+  if (distance < 60)
+  {
+    havemotion = true;
+    checksaftersafe = 0;
+    digitalWrite(laserPin, HIGH);
+    for( int i = 0; i < NUM_LEDS; i++) {
+      pixels.setPixelColor(i, pixels.Color(255, 0, 0));
+    }
+  }
+  else
+  {
+    // 20 times would be about 10 seconds of safety
+    if (havemotion && checksaftersafe < 20)
+    {
+      for( int i = 0; i < NUM_LEDS; i++) {
+        pixels.setPixelColor(i, pixels.Color(0, 255, 0));
+      }
+      checksaftersafe++;
+    }
+    else
+    {
+      for( int i = 0; i < NUM_LEDS; i++) {
+        pixels.setPixelColor(i, pixels.Color(0, 0, 255));
+      }
+      checksaftersafe = 0;
+      havemotion = false;    
+    }
+    digitalWrite(laserPin, LOW);
+  }
+
+  // now lets do the door open limit switch logic
+  if (dooropen == HIGH)
+  {
+    Serial.println("Door closed");
+    digitalWrite(doorsensorled, LOW);
+  }
+  else
+  {
+    Serial.println("Door open");
+    digitalWrite(doorsensorled, HIGH);
+  }
+
+  pixels.show();
+  delay(250);
+}