Our project is about detecting intruders and alerting the host. We decided to make this project due to the fact that we will be living in an apartment with no room alarms, so we decided to make our own. The project works by detecting intruders or general passerby's through a motion sensor, which then sets off an alarm to notify them that they are seen (In hopes they don't try anything), and finally by notifying the main user of the alarm being triggered. Our project utilized two particle argons, an LCD screen, a PIR motion sensor and a buzzer.
How it Works:
The first argon is connected to the motion sensor and buzzer. Each sensor is connected to power, ground and to a digital pin on the argon. The motion sensor pin is connected to pin
Breadboard View of the Buzzer and Motion Sensor
Motion vs. Time Detected
The image above shows a picture taken from our google sheets of different time instances of motion being captured. You may view the live link within software/apps further up this page. Data was taken directly from the particles console readings through IFTT and formatted into google sheets. A new sheet was then added with code to only pull motion and time points for every instance to simplify the data. Finally, in the last sheet you may see the image above, where the formatted data points were plotted. (Spread Sheet: https://docs.google.com/spreadsheets/d/13J5VMuyPMXG020TMau5VeLzELuW9Vnb82z4zOLGOaFI/edit?usp=sharing)
LCD Screen Message when Motion is not Detected
The image above represents the LCD screen when no motion is detected by the motion sensor. The message just means the system is armed and ready to alert whenever motion is detected.
LCD Screen Message when Motion is Detected
The image above is the LCD screen when motion has been detected by the motion sensor. It causes the buzzer to go off and the screen to print "Warning Motion Detected". The same trigger that sends a signal to change the message on the LCD screen is also used to send a message through the IFTTT app. The app sends me a notification on my phone every time the motion sensor is triggered as shown below.
This is the overall flowchart of our Instrumentation project design, Each step in the process of our project can be found here. The flowchart shows how all of the sensors, charts, and notifications interact with each other through the particles argons and the code that is provided below.
PIR Motion Sensor and Passive Buzzer Circuit Diagram
Both the Buzzer and Motion Sensors have a positive and negative terminal that are connected to the power and ground rails. They each also have 1 wire connected to a digital pin. The motion sensor sends a signal through the D2 pin and the buzzer receives a signal through the D3 pin.
LCD Screen Circuit Diagram
The LCD Screen is used to show a message when motion is detected by the motion sensor. The potentiometer is used to adjust the backlight of the LCD screen so you can see the message.
This part of the code senses motion and triggers a buzzer sound as a result. This code also sends data into a google sheets to document each time instance of detected motion.
// This #include statement was automatically added by the Particle IDE.#include<JsonParserGeneratorRK.h>// This #include statement was automatically added by the Particle IDE.#include<LiquidCrystal.h>intsensorPin=2;//Sensor pinintbuzzerPin=6;//Buzzer pinintmotionsensorInput=0;//This reads the motion statusinttemp=0;voidsetup(){pinMode(D2,INPUT);//sets the motion sensor pin as an inputpinMode(D6,OUTPUT);//sets the passive buzzer to be an outputdelay(10000);//Calibration Delay for Motion Sensor}voidloop(){motionsensorInput=digitalRead(D2);//reads the input valueif(motionsensorInput==HIGH){//checks to see if there is an input. If there is: the led turns on, the argon publishes an event to trigger IFTTT, waits 5 seconds, then stops buzzer noise.beep();//beep loop played for sound createEventPayload(motionsensorInput);//event for reading motion to input in google sheetsParticle.publish("IntruderAlert","Warning",PRIVATE);delay(1000);digitalWrite(D6,LOW);}else{digitalWrite(D6,LOW);delay(1000);}}//code for passive buzzer beepsvoidbeep(){tone(D6,3500,50);tone(D6,2000,50);tone(D6,3500,50);tone(D6,2000,50);delay(50);}//Following code is for formatting into google sheetsvoidcreateEventPayload(intmotionInput){JsonWriterStatic<256>jw;{JsonWriterAutoObjectobj(&jw);jw.insertKeyValue("Motion",motionInput);}Particle.publish("env-vals",jw.getBuffer(),PRIVATE);}
LCD Screen
C/C++
This code pulls information from the Motion and Buzzer code to display alerts to an LCD screen and also by phone notification based on motion readings.
// This #include statement was automatically added by the Particle IDE.#include<Adafruit_LiquidCrystal.h>#include"application.h"#include"Particle.h"//int RS = D8; //Integers/Commections from the LCD screen to the argon//int E = D7;//int D4 = D6;//int D5 = D5;//int D6 = D4;//int D7 = D3;LiquidCrystallcd(D8,D7,D6,D5,D4,D3);//Initializing the connections for the LCD screen with the outputs of the argonvoidsetup(){lcd.begin(16,2);// Setting up the LCD screen displaylcd.setCursor(3,0);// Moving the cursor to row 1 and in the middlelcd.print("Booting Up");delay(5000);// 5 second delay in the code so you can see the display messagelcd.clear();// clearing the screen for other inputsParticle.subscribe("IntruderAlert",screenprint);}voidloop(){lcd.setCursor(6,0);// Moving the cursor to row 1 and in the middlelcd.print("Armed");// Displaying the string Armedlcd.setCursor(4,1);// Moving the cursor to row 2 of the screen and to the left a little morelcd.print("Alarm On");// Displaying the string Alarm On}voidscreenprint(constchar*event,constchar*data){delay(1000);//1 second delaylcd.clear();//Clearing the screen for new message to be displayeddelay(1000);// 1 second delaylcd.setCursor(4,0);// Moving the cursor to row 1 on the LCD screenlcd.print("Warning");// Displaying the string Warninglcd.setCursor(0,1);// Moving the LCD screen cursor to another positionlcd.print("Motion Detected");// Displaying the string Motion Detecteddelay(2000);// 2 second delay in the code so you can see the display messagelcd.clear();// clearing the screen for other inputsdelay(1000);}
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