Published April 22, 2022

Welcome Home :)

Our project helps you keep piece and mind while having a motion-activated sensor at your front door.

IntermediateFull instructions provided181

Things used in this project

Hardware components

Particle Argon

Breadboard (generic)

Jumper wires (generic)

Standard LCD 16x2 with Extras

Resistor 220 ohm

PIR Motion Sensor (generic)

Buzzer

LED (generic)

Mini Photocell

Software apps and online services

IFTTT Maker service

Google Sheets

Particle Build Web IDE

Fritzing

Hand tools and fabrication machines

Soldering iron (generic)

Story

Stop worrying about all of those tedious locks

Background:

We wanted to create an easy and safe security system that any beginner could create. This system will use a trio of Particle Argons, a photocell, a motion sensor, and a buzzer. The motion sensor detects motion on the front porch and alerts the LCD screen. Then once the door is opened, the photocell detects a light change and sounds the buzzer.

How it Works:

The first argon is connected to the LCD screen, buzzer, variable resistor, and LED. The motion sensor on the second argon detects motion outside the door and sends the data to the screen to display motion activated. The LED acts as a confirmation to the circuit that it is running correctly.

1 LCD_LED_Buzzer

The second argon is connected has the motion sensor which detects any movement outside and relays the information back to the screen.

2 Motion Sensor

The third argon acts as a laser sensor by using a photocell and an LED. The photocell is attached to the door that swings open when the door is moved. It detects the light from the LED that is constantly on and as it opens the light disappears which then alarms the buzzer.

3 Photocell_LED

Flowchart

Google Sheets Data

Code

int led1 = D7;
int photocell = A0;
int analogValue;

void setup() {

  pinMode(photocell, INPUT);
  pinMode(led1, OUTPUT);

}

void loop() {
  
  analogValue = analogRead(photocell);
  
  if (analogValue < 100) {
      Particle.publish("door-open", PRIVATE);
      digitalWrite(D7, HIGH);
      delay(2500);
      
  } else {
      digitalWrite(D7, LOW);
      delay(3000);
  }

}

// This #include statement was automatically added by the Particle IDE.
#include <LiquidCrystal.h>
// This #include statement was automatically added by the Particle IDE.
#include "LiquidCrystal/LiquidCrystal.h"

LiquidCrystal lcd(5, 4, 3, 2, 1, 0);

int buzzPin = D6;
int ledPin = D8;

void setup() {
  lcd.begin(16, 2);
  lcd.setCursor(0,0);
  lcd.print ("STARTING");
  delay(3000);
  lcd.clear();
  pinMode(D6, OUTPUT);
  pinMode(D8, OUTPUT);
  Particle.subscribe("motion-detected", motiondetected, MY_DEVICES);
  Particle.subscribe("motion-detected", screenprint, MY_DEVICES);
  Particle.subscribe("door-open", buzzer, MY_DEVICES);
}

void loop() {
    lcd.setCursor(0,0);
    lcd.print("CLEAR");
}

void motiondetected(const char *event, const char *data) {
    digitalWrite(D8, HIGH);
    delay(1000);
    digitalWrite(D8, LOW);
    delay(1000);
}

void screenprint(const char *event, const char *data) {
    delay(1000);
    lcd.clear();
    delay(1000);
    lcd.setCursor(0,0);
    lcd.print("MOTION DETECTED");
    delay(1000);
    lcd.clear();
    delay(1000);
}

void buzzer(const char *event, const char *data) {
    beep();
    delay(1000);
    digitalWrite(D6, LOW);
}

void beep() {
    tone(D6, 3000, 4000);
    delay(50);
}

Welcome Home :)