Details

IOTProjectTeam46: Christopher Brannon, Joshua Smith

Published November 20, 2019

Automatic Light Switch

Turn your light switch on and off from your phone.

IntermediateWork in progress997

Things used in this project

Hardware components

Particle Argon

Solderless Breadboard Full Size

High Brightness LED, White

USB-A to Mini-USB Cable

SG90 Micro-servo motor

Jumper wires (generic)

PIR Motion Sensor (generic)

Fishing Line

Hand tools and fabrication machines

Multitool, Screwdriver

Tape, Electrical

Story

Ever walk into a room and have to feel around to find the light switch? Ever get in bed and then have to get back up to turn off the light? Never again! With the use of our automatic light switch you can walk into a lit room and turn off the light from the warmth of your bed!

Details

A motion sensor is placed directly inside of the door attached to the first argon. When the door is opened it triggers a sensor that signals the second argon to run the code. This rotates the servos, pulling on the string and turning the light on.

When one wants to turn off the light, all they need is the IFTTT app on their cell phone. The second argon has been coded using the DO IT button widget to receive a signal when activated through the widget button on the person's cell phone to rotate the servo motor in reverse of the motion sensor code. This turns the light back off.

IFTTT and Argon Integration

We have also coded a button on the cell phone to turn the light on if you want to turn it on remotely without triggering the motion sensor.

Displayed below are pictures of the experiment's set-up and a video showing how the experiment works.

Servo Argon Setup

Close Up of Servo Argon Setup

Motion Sensor Argon Setup

Close Up of Motion Sensor Argon Setup

Instructional Video

Particle Cloud Interfacing

Along with the motion sensor and the servo motor code we have also made the two Argon's communicate back and forth. This what made the ability to use 2 Argon's possible one to contain the motion sensor and one to contain the two servos. You can see in our code that both of the Argon's publish data to the cloud when it is triggered by either the motion sensor or the app. They also publish to the cloud when the read what they have been subscribed to on the cloud. As shown below when the motion sensor on the first Argon named Aardvark senses motion it publish the event lightSwitchon, the second Argon Turtle then reads the cloud via a subscription command and knows to power the servo motors. Also, when Turtle is triggered by the app to turn the lights off it publishes lightSwitchoff and then Aardvark reads the cloud and publishes lightSwitchISoff so that they both know the light switch is off. This also occurs when the app triggers turtle to turn the light on it publishes lightSwitchOn2 in the cloud and Aardvark then sends out lightSwitchAlreadyOn.

Particle Console (i.e. Cloud hub)

Data Collection

As you can see in the above picture using the same app IFTTT we were able to make the Argon's publish live data to google sheets. This occurs via the IFTTT reading the cloud and waiting for the events to be published. Once lightSwitchOn, lightSwitchOff, or lightSwitchOn2 have been published it then takes the data and displays in google sheets as show below.

IFTTT & Google Sheets Integration

Live Data

This data was then displayed in a graphical format to display what is happening in a better way. This can be see below in the 3 graphs each showing one command occurring.

This shows when the motion sensor gets triggered

This shows when the app turns the light switch off

This shows when the light switch is turned on by the app

Below are the links for the google sheets that contain the data for each light switch command.

https://docs.google.com/spreadsheets/d/1wpgqe7wE7r86QxiFp-yow3_DO6rR7yXaWFrBPz2MbXA/edit?usp=sharing

https://docs.google.com/spreadsheets/d/161UtVH3VM48LbJ5Y5_DxE0JiAasK2nNLKkSTmheDrZ4/edit?usp=sharing

https://docs.google.com/spreadsheets/d/1JPdgoZ_CJVhSoJjcpgpEOBQqUnj8QCjE7nG9PjwpogE/edit?usp=sharing

Code

int led = D7;

Servo rightServo;
Servo leftServo;


void setup() {
    
   

    rightServo.attach(D2);
    leftServo.attach(D3);
    
   
    
    pinMode(led, OUTPUT);
    digitalWrite(led, LOW);
    
  
    
  Particle.subscribe("lightSwitchOn", myHandler,"e00fce686eb6f38cd0da6697");
   
  Particle.function("lightSwitchoff", lightSwitchOff); 
  
  
  
  Particle.function("lightSwitchon", lightSwitchOn2);
  
  
 
  
}

int lightSwitchOff(String command)   
{                          
    if(command == "off")   
    {   
        digitalWrite(D7, HIGH); 
        delay(1000);
        rightServo.write(180);       
                                     
                                   
        leftServo.write(0);      
        
        digitalWrite(D7, LOW);  
         Particle.publish("lightSwitchOff","off");
           
    }
}
int lightSwitchOn2(String command)   
{                          
    if(command == "on")   
    {   
        digitalWrite(D7, HIGH); 
        delay(1000);
        rightServo.write(0);       
                                     
                                   
        leftServo.write(180);      
        
        digitalWrite(D7, LOW);  
        Particle.publish("lightSwitchOn2","on");
           
    }
}


void myHandler(const char *event, const char *data) {
    

        digitalWrite(led, HIGH);
        
        delay(1000);
       
        rightServo.write(0);
        
        leftServo.write(180);
        
       
   
  
        
        
        digitalWrite(D7, LOW);
        
   }
   
   void publish(){
        
       
   }

int inputPin = D2;              
int ledPin = D7;                
int pirState = LOW;             
int val = 0;                    

int calibrateTime = 5000;      

void setup() {
    
    pinMode(ledPin, OUTPUT);
    pinMode(inputPin, INPUT);    
    
  Particle.subscribe("lightSwitchOn2", reportTheData1, "e00fce684e209ce7114d713a");  
  Particle.subscribe("lightSwitchOff", reportTheData2, "e00fce684e209ce7114d713a");  
 
}




void loop() {

  
  if (calibrated()) {
 
    readTheSensor();

   
    reportTheData();
    
   
    }
    
 
}
void reportTheData2(const char *event, const char *data){   

    
        
            
            Particle.publish("lightSwitchISOff", "off");

}
void reportTheData1(const char *event, const char *data){        
        
       
            
         Particle.publish("lightSwitchAlreadyOn", "on");
         
        
        
        
}




void readTheSensor() {
    val = digitalRead(inputPin);
}

bool calibrated() {
    return millis() - calibrateTime > 0;
}



void reportTheData() {
    if (val == HIGH) {

        if (pirState == LOW) {
          
        Particle.publish("lightSwitchOn", "on");
        
        pirState = HIGH;
        
        setLED(pirState);
        }
    } 
 else {
    if (pirState == HIGH) {
     
      pirState = LOW;
      setLED(pirState);
    }
  }
}
        

void setLED(int state) {
    digitalWrite(ledPin, state);
}

Credits

Christopher Brannon

1 project • 0 followers

Joshua Smith

1 project • 0 followers

Automatic Light Switch

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Details

Schematics

Motion Sensor

Servos

Code

Servo

Motion Sensor

Credits

Christopher Brannon

Joshua Smith

Comments

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Automatic Light Switch

Automatic Light Switch

Things used in this project

Hardware components

Hand tools and fabrication machines

Story

Details

Schematics

Motion Sensor

Servos

Code

Servo

Motion Sensor

Credits

Christopher Brannon

Joshua Smith

Comments

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