Published November 20, 2017 © GPL3+

Motion Sensor MEGR-3171 FALL 2017

A simple and easy way to use two photons to alert you when motion has been detected.

BeginnerFull instructions provided4 hours1,040

Things used in this project

Hardware components

Particle Photon

Jumper wires (generic)

LED (generic)

Breadboard (generic)

USB-A to Micro-USB Cable

PIR Motion Sensor (generic)

Software apps and online services

IFTTT Maker service

Google Sheets

Story

Background:

Are you ever curious what time your kid snuck in late last Friday night, or if your amazon order actually was delivered to your front steps. For these reasons we created this IOT device to be better aware of when people are at the front door, without having to be there. In order to achieve this goal two particle photons were used. The first was wired to a motion sensor and it would publish to the Internet. The next photon was attached to a led and also subscribed to the first photon.

How it works Motion Sensor:

The first photon, the one with a motion sensor attached has the task of detecting the motion in front of a front door. Anytime motion was detected the photon published an event to the particle website as seen below in fig 1. We also created an applet in IFTTT that will notify you via your smartphone when motion is detected.

Figure 1: Particle Dashboard Data

How it works: LED

The second photon, the one with the LED wired to it is used to visually alert the homeowner if someone is at the door. The LED photon is subscribed to the motion sensor via a particle.subscribe function. This means anytime the first photon detects motion it will tell the second photon to blink the LED.

Testing:

To test our device, it was placed outside the front door of our house on two separate days. After doing this we noticed that on Sunday the house received more foot traffic, this believed to be caused by TV sporting events.

Figure 2: Monday Test Data

Figure 3: Sunday Test Data

Demonstration Video:

Figure 4: Demo Video

Code

Untitled file

// First photon, Motion sensor
int inputPin = D0;              
int ledPin = D1;                
int pirState = LOW;             
int val = 0;                    

int calibrateTime = 10000;      

void setup()
{
  pinMode( ledPin, OUTPUT );
  pinMode(inputPin, INPUT);     
}

void loop()
{

  
  if ( calibrated() )
  {

    readTheSensor();

   
    reportTheData();
  }
}

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

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

void reportTheData() {

  
  if (val == HIGH) {

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

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







//Second Photon, LED
int led = D7;



void setup() {

pinMode(led, OUTPUT);
digitalWrite(led, LOW);

Particle.subscribe("Motion_alert", myHandler, "43001b001951353337343731");


}

void myHandler(const char *event, const char *data)
{
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
  delay(1000);
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
  delay(1000);
  digitalWrite(led, HIGH);
  delay(1000);
  digitalWrite(led, LOW);
  
}
void loop() {

}

Credits

David Daniel

1 project • 0 followers

Kyle Byrd

1 project • 1 follower

Motion Sensor MEGR-3171 FALL 2017

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Motion Sensor

LED

Code

Untitled file

Credits

David Daniel

Kyle Byrd

Comments

Embed the widget on your own site

Motion Sensor MEGR-3171 FALL 2017

Motion Sensor MEGR-3171 FALL 2017

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Motion Sensor

LED

Code

Untitled file

Credits

David Daniel

Kyle Byrd

Comments

Related channels and tags