App And Remote Controlled Servo Door Lock

Lock and unlock a door from anywhere using the in home controller or a smartphone app.

IntermediateShowcase (no instructions)2 hours2,665

App And Remote Controlled Servo Door Lock

Things used in this project

Hardware components

ControlEverything.com Particle Photon I²C 2-Channel SPDT 1-Amp Signal Relay

Servos (Tower Pro MG996R)

Solderless Breadboard Half Size

2 breadboards were included with the Particle Photons

LED (generic)

2 LEDs were included with the Particle Photons

SparkFun Pushbutton switch 12mm

Battery Power Bank with 2 micro USB cables

Software apps and online services

ControlEverything.com Mobicle

This is where the the unlock and lock commands are sent from

IFTTT Maker service

This app will notify you when the door is locked or unlocked

Hand tools and fabrication machines

Aluminum Foil (generic)

This gave the servo a steady base which was attached to the door

Hot glue gun (generic)

This held the components on the door

Story

The project was to create an automatic door lock that can be controlled with a remote particle or through the Mobicle app.

We accomplished this by attaching an arm from the top of the lock to a rotational hobby servo. The servo was mounted with tin foil around the servo motor to create a wider base. The aluminum foil base was then hot glued to the door along with the Particle Photon breadboard and a small power bank. The servo is connected to a Particle Photon with a tactile button for opening without using the Mobicle app. The controller Particle Photon also has the tactile button but also two LEDs to indicate weather the door is locked or unlocked. The Particle Photon connected to the servo can also be controlled withe Mobicle app and notifications can be received when the door is locked or unlocked with the IFTTT app.

Code

//Lock function
int lock(String) {
    //Moves servo to lock position
    serv.write(valLock);
    //Lock number changes to 1
    nLock = 1;
    //Publishes "Locked"
    Particle.publish("mbenne_door_lock","Locked");
    //Switches the external LED off
    digitalWrite(boardLed,LOW);
}

//Unlock function
int unlock(String) {
    //Moves servo to unlock position
    serv.write(valUnlock);
    //Lock number changes to 0
    nLock = 0;
    //Publishes "Unlocked"
    Particle.publish("mbenne_door_lock","Unlocked");
    //Switches the board LED on
    digitalWrite(boardLed,HIGH);
}

void loop() {
    //If the button is pressed, the locked switches between locked and unlocked
    if (analogRead(button)<100) {
        //Lock sequence
        if (nLock==0) {
            //Moves servo to locked position
            serv.write(valLock);
            //Changes lock number to 1
            nLock = 1;
            //Publishes "Locked"
            Particle.publish("mbenne_door_lock","Locked");
            //Switches the board LED off
            digitalWrite(boardLed,LOW);
            delay(1000);
        }
        //Unlock sequence
        else if (nLock==1) {
            //Moves servo to unocked position
            serv.write(valUnlock);
            //Changes lock number to 0
            nLock = 0;
            //Publishes "Unlocked"
            Particle.publish("mbenne_door_lock","Unlocked");
            //Switches the board LED on
            digitalWrite(boardLed,HIGH);
            delay(1000);
        }
    }
}

void myHandler(const char *event, const char *data) {
    //When the "Lock" event data is published with the sucribed with "akaram_door_lock", the lock switches bewtween lock and unlock
    if (strcmp(data,"Lock")==0) {
        //Lock sequence
        if (nLock==0) {
            //Moves servo to lock position
            serv.write(valLock);
            //Changes lock number to 1
            nLock = 1;
            //Publishes "Locked"
            Particle.publish("mbenne_door_lock","Locked");
            //Switches board LED off
            digitalWrite(boardLed,LOW);
        }
        //Unlock sequence
        else if (nLock==1) {
            //Moves servo to unlock position
            serv.write(valUnlock);
            //Changes lock number to 0
            nLock = 0;
            //Publishes "Unlocked"
            Particle.publish("mbenne_door_lock","Unlocked");
            //Switches the board LED on
            digitalWrite(boardLed,HIGH);
        }
    }
}

//Power to switch is on pin A0
int power = A0;
//Button on pin A1
int button = A1;
//Lock LED is on pin D0
int ledLock = D0;
//Unlock LED is on pin D1
int ledUnlock = D1;
//Board LED is on pin D7
int boardLed = D7;
//Assigns variables to lock(1) or unlock(0)
int nLock = 0;

void setup() {
    //Describes outputs and input of pins
    pinMode(power,OUTPUT);
    pinMode(button,INPUT);
    pinMode(boardLed,OUTPUT);
    pinMode(ledLock,OUTPUT);
    pinMode(ledUnlock,OUTPUT);
    
    //Suscribes to other photon
    Particle.subscribe("mbenne_door_lock", myHandler);
    
    //Powers the pin connected to the switch 
    analogWrite(power,4095);
    
    //both LEDs turn on when switch is powered
    digitalWrite(ledLock,HIGH);
    digitalWrite(ledUnlock,HIGH);
    
    //Flashes board LED when setup is complete
    digitalWrite(boardLed,HIGH);
    delay(300);
    digitalWrite(boardLed,LOW);
    delay(300);
    digitalWrite(boardLed,HIGH);
    delay(300);
    digitalWrite(boardLed,LOW);
    delay(300);
    digitalWrite(boardLed,HIGH);
    delay(300);
    digitalWrite(boardLed,LOW);
    
    //Lock LED turns off to leave the Unlock LED on
    digitalWrite(ledLock,LOW);
}

void loop() {
   //If the button is pressed, "Lock" is published and the board LED flashes 3 times
    if (analogRead(button)<100) {
            Particle.publish("akaram_door_lock","Lock");
            digitalWrite(boardLed,HIGH);
            delay(100);
            digitalWrite(boardLed,LOW);
            delay(100);
            digitalWrite(boardLed,HIGH);
            delay(100);
            digitalWrite(boardLed,LOW);
            delay(100);
            digitalWrite(boardLed,HIGH);
            delay(100);
            digitalWrite(boardLed,LOW);
            delay(1000);
    }
}

void myHandler(const char *event, const char *data) {
    //When "Unlocked" is recieved from "mbenne_door_lock", the unlocked LED turns on and the locked LED turns off
    if (strcmp(data,"Locked")==0) {
        digitalWrite(ledUnlock,LOW);
        digitalWrite(ledLock,HIGH);
    }
    //When "Locked" is recieved from "mbenne_door_lock", the locked LED turns on and the unlocked LED turns off
    else if(strcmp(data,"Unlocked")==0) {
        digitalWrite(ledLock,LOW);
        digitalWrite(ledUnlock,HIGH);
    }
}