Published June 24, 2016 © GPL3+

Trespasser Detector

This is a project which helps you to detect the one who break into your rooms without your authorization.

BeginnerFull instructions provided3 hours914

Things used in this project

Hardware components

Particle Photon

Story

So, at first, I work out with this project doesn't means somebody break into my room and I need to get him. The real reason why I build this trespasser detector is because I happen to have some reed switches and some magnets. So I want to build some thing funny. And then, I came up with this idea.

The theory of this project is pretty simple.

Detect the status of the door correctly.

Monitor the status of the button after detect the door was opened. 3. send out the information to cloud and get a Email says some one break into your room.

Detect the door status

The way to detect the door status is easy. I use two reed switch and a magnet to detect the door status.

door detect circuit

So, from this schematic. I can figure out that in default mode, both D0 and D1 are high, but if S1 or S2 pressed down. Then D0 or D1 will be low. So that means I can figure out which switch was activated at first by monitor which port (D0/D1) go low first. Suppose I first pressed the S1 and then pressed S2, that means the D0 will go low early than D1. So, we can define if D0 go low early than D1, that means Open the door, and if D1 go low first than D0, that means Close the door. Pretty simple, right!

So above is the theory of detecting the door status. But how can it be realized? We use reed switch to do that job. Reed switch is a switch that controlled by magnet. If there is a magnet close to the center contact area of that switch, the contact area will contact with each other, then, it act just like a normal pressed switch.

reed switch

I use two reed switches and solder them on one board, which will be installed on the wall, and I also get some magnet on another PCB board, which will be installed on door.

two reed switch on a bare PCB board which i used for other projects.

Wire them up like the door detect circuit.

since i only have those small magnet, so i gather them together,so enlarge the magnetic field

After that, I put the reed switch board on the doorframe and the magnet board on the door. So every time, when I open or close the door, the magnet will get a change to hover on both reed switch in a sequence, and the reed switch board can remain still.

install both reed switch board and manget board.

make sure the magnet can active the reed switch when open or close the door.

When installing those board, I have to make sure the reed switch will be activated when the magnet hover under it.

Monitor the status of the button.

After installing the door status detector successfully, the next step is add a button which can cease the alarm. That is super easy, just connect one side of button to D2 of Photon and another side wire to Ground, Also, need a weak pullup resistor from D2 to 3V3.

perfboard after solder a alarm beep and pull up resistor

Final control board for Door detector.

After finsih the prototype of the control board, the final step is install them into the wall switch box. Make sure to hidden the cease button under the box so that no one can find it after open the door.

Final assembly

After that, seal the box with a transparent cover, so that I can figure out the status of the photon through the RGB led without open it.

Almost finished project.

That is the picture with all the part of door detector, I actually need to use a smaller power adapter which can put int the wall switch box to power the Photon instead of using this black one:

Door status detector.

After that, the next step is make it send me an Email everytime it get an alarm by use the Particle cloud and IFTTT service, open www.ifttt.com and open the channel named Particle. Chosen new event published as the trigger like below:

Choose the tirger name and content.

Then the action channel choose the Gmail. Filled in with Gmail address.

Fill in with the Gmail address.

Then everything is done, I can now receive the email from IFTTT once I get an alarm from Photon.

Get the Email once photon detect the alarm

Finally, I got an door status detector which can tell me more information by simply open the door.

code

#include<application.h>

#define SWITCH_1 D0
#define SWITCH_2 D1
#define RELIEF_DET D2
#define BEEP    D3


#define DOOR_NONE  0    //the initial status of the door. 
#define DOOR_CLOSE 1
#define DOOR_OPEN  2
#define DOOR_ERROR 3

#define DEBUG

#define YES     2
#define NO      1
#define INITIAL 0

#define BEEP_ON 1
#define BEEP_OFF 0

#define THRESHOLD_TIME 5000

int doorState=DOOR_NONE;

String doorStatus;

unsigned char door_detect(void)
{
    static unsigned char flag_reed1=0;
    static unsigned char flag_reed2=0;
    static unsigned char stage=0;
    
    unsigned char door_status=0;

    switch(stage)
    {
        case 0:
            flag_reed1=0;
            flag_reed2=0;
            if((digitalRead(SWITCH_1)==0)||(digitalRead(SWITCH_2)==0))  //if one of the swtich had been activated
                stage=1;
            break;  
        case 1:     //detect which switch had been activated
            if((digitalRead(SWITCH_1)==0)&&(digitalRead(SWITCH_2)==1))  
            {
                flag_reed1=1;
                flag_reed2=0;
                stage=2;
            }
            else
           if((digitalRead(SWITCH_1)==1)&&(digitalRead(SWITCH_2)==0))  
            {
                flag_reed1=0;
                flag_reed2=1;
                stage=2;
            }
            else
            if((digitalRead(SWITCH_1)==1)&&(digitalRead(SWITCH_2)==1))  //hardware error
            {
                stage=3;
            }
            else
            if((digitalRead(SWITCH_1)==0)&&(digitalRead(SWITCH_2)==0))  //hardware error
            {
                stage=3;
            }
            break;
        case 2: //detect another switch
            if(flag_reed1==1)
            {
                if((digitalRead(SWITCH_1)==1)&&(digitalRead(SWITCH_2)==0))  
                {
                    door_status=DOOR_OPEN;
                    stage=0;//go back to the original stage
                    Serial.println("Detect open door action");
                } 
                //need to add some code to determine the interval time btween those two switch.
            }
            else
            if(flag_reed2==1)
            {
                if((digitalRead(SWITCH_1)==0)&&(digitalRead(SWITCH_2)==1))  
                {
                    door_status=DOOR_CLOSE;
                    stage=0;//go back to the original stage
                    Serial.println("Detect close door action");
                }  
                  //need to add some code to determine the interval time btween those two switch.
            }
            break;
        case 3:
            door_status=ERROR;
            stage=0;
            break;
        default:
            break;
    }
    return door_status;
}


void beepAlarm(unsigned char state)
{
    if(state==BEEP_ON)
       digitalWrite(BEEP,HIGH);
    else
        digitalWrite(BEEP,LOW);
}

int doorDetecter(String led)
{
    return 1;
}


void setup()
{
  //  Particle.variable("doorState", &doorState, INT);
//    Particle.function("status", doorDetecter);
    pinMode(SWITCH_1,INPUT);
    pinMode(SWITCH_2,INPUT);
    pinMode(RELIEF_DET,INPUT);
    pinMode(BEEP,OUTPUT);
    
    pinMode(D7,OUTPUT);
    digitalWrite(D7,LOW);
    digitalWrite(SWITCH_1,HIGH);
    digitalWrite(SWITCH_2,HIGH);
    digitalWrite(RELIEF_DET,HIGH);
    digitalWrite(BEEP,LOW);
    Serial.begin(9600);
}



void loop() {
    static unsigned long olderTime;
    static unsigned long ExitTime;
    static unsigned char reliefAlarm=0;
    static unsigned char forceExit=0;
    static unsigned char firstPress=0;
    unsigned char temp=0;
    unsigned int publicValue=0;
    
    
    if(doorState==DOOR_NONE)        //detect the door status only when the status is unknow. will not process it if the last 
                                    //state is op and not realified
    {
        temp = door_detect();
        
        if(temp==DOOR_OPEN)        
        {
            olderTime=millis();
            doorState=DOOR_OPEN;
            digitalWrite(D7,HIGH);  //turn on the led to indicate the door status
            Serial.println("record the current times for alarm");
        }
        else
        if(temp==DOOR_CLOSE)       
        {
            olderTime=millis();
            doorState=DOOR_CLOSE;
            digitalWrite(D7,LOW);   //turn off the led once closed the door
            Serial.println("record the currnet time");
            
        }   
    }
    
    if(doorState==DOOR_OPEN)        //start to detect the relief button 
    {
        if((digitalRead(RELIEF_DET)==0)&&((millis()-olderTime)<=THRESHOLD_TIME))  //detect whether the user had pressed the relief button or not.set up the flag if pressed
        {
            Serial.println("Relief alarm button detected");
            reliefAlarm=YES;
            digitalWrite(D7,LOW);  //turn off the led once the relief button had pressed
        }
        else
        if((millis()-olderTime)>THRESHOLD_TIME)  //if 5 seconds passed after open the door,maybe it's too long
        {
            doorState=DOOR_NONE;    //make the door state go to initial mode
            if(reliefAlarm==YES)        //if in 5s, the user had pressed the relief button
            {
                //do nothing here since the batton had pressed
                digitalWrite(D7,LOW);   //turn off the led once the alarm had turned off
                Serial.println("Relief the alarm,go back to initial stage");
                reliefAlarm=INITIAL; //go back to the initial alarm status
                beepAlarm(BEEP_OFF);   // just incase it turned on accidenlty
            }
            else
            {
                reliefAlarm=NO; //not reliefed the alarm
                digitalWrite(D7,HIGH);
                Serial.println("Detect an alarm");
                forceExit=1;
                beepAlarm(BEEP_ON);
             //   doorStatus="Alarmed";
                bool success;
                success=Particle.publish("doorStatus","Alarmed");
                if(!success)
                    Serial.println("Failed to publish this event");
                else
                    Serial.println("Event had published successfully");
            }
        }   
    }
    else
    if(doorState==DOOR_CLOSE)       //no other action when close the door,but need to change back five seconds later
    {
        if((millis()-olderTime)>=THRESHOLD_TIME)
        {
            Serial.println("Go back to initial stage");
            doorState=DOOR_NONE;
        }
    }
        
    if(forceExit==1)//method to relief the alarm after detect an alarm. 
    {
        if((digitalRead(RELIEF_DET)==0)&&(firstPress==0))  //which mean the user pressed the relief button after five seconds later.
        {
            firstPress=1;
            olderTime=millis();
        }
        if(((millis()-olderTime)>=THRESHOLD_TIME)&&(digitalRead(RELIEF_DET)==0))  //if the button had pressed down for more than 5 seconds,then,also relief the alarm
        {
            firstPress=0;   //go to initial stage;
            forceExit=0;    //go to initial stage;
            reliefAlarm=INITIAL;
            beepAlarm(BEEP_OFF);
            digitalWrite(D7,LOW);
            Serial.println("Force relief the alarm,go back to initial stage");
        }
        
            
    }
}

Credits

Eric yuan

4 projects • 1 follower

Trespasser Detector

Things used in this project

Hardware components

Story

Detect the door status

Monitor the status of the button.

Code

code

Credits

Eric yuan

Comments

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Trespasser Detector

Trespasser Detector

Things used in this project

Hardware components

Story

Detect the door status

Monitor the status of the button.

Code

code

Credits

Eric yuan

Comments

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