Rohit Rangwani
Published

Feel the Force! - Detecting the Force

PIR based force detector with Particle Photon at core.

BeginnerFull instructions provided3 hours864
Feel the Force! - Detecting the Force

Things used in this project

Hardware components

Photon
Particle Photon
×1
PIR Motion Sensor (generic)
PIR Motion Sensor (generic)
PIR(Passive Infrared) sensor
×1

Software apps and online services

Pushbullet

Story

Read more

Schematics

Schematic

Code

Particle photon firmware code

Arduino
#define MOTION_NOTIF "PIR"
//the time we give the sensor to calibrate (10-60 secs according to the datasheet)
int calibrationTime = 60;        //maximum time to calibration

//the time when the sensor outputs a low impulse
long unsigned int lowIn;         

//the amount of milliseconds the sensor has to be low 
//before we assume all motion has stopped
long unsigned int pause = 6000;  

boolean lockLow = true;
boolean takeLowTime;  

int pirPin = D1;    //the digital pin connected to the PIR sensor's output
int ledPin = D7;

/////////////////////////////
//SETUP
void setup(){
  pinMode(D0, OUTPUT);
  pinMode(D2, OUTPUT);
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  digitalWrite(pirPin, LOW);
  digitalWrite(D2, LOW);
  digitalWrite(D0, HIGH);

  //give the sensor some time to calibrate
  Spark.publish("calibrating sensor ");
    for(int i = 0; i < calibrationTime; i++){
      delay(1000);
      }
    Spark.publish(" done");
    delay(50);
  }

////////////////////////////
//LOOP
void loop(){

     if(digitalRead(pirPin) == HIGH){
       digitalWrite(ledPin, HIGH);   //the led visualizes the sensors output pin state
       if(lockLow){  
         //makes sure we wait for a transition to LOW before any further output is made:
         lockLow = false;            
         motion_notify_user(); 
         delay(50);
         }         
         takeLowTime = true;
       }

     if(digitalRead(pirPin) == LOW){       
       digitalWrite(ledPin, LOW);  //the led visualizes the sensors output pin state

       if(takeLowTime){
        lowIn = millis();          //save the time of the transition from high to LOW
        takeLowTime = false;       //make sure this is only done at the start of a LOW phase
        }
       //if the sensor is low for more than the given pause, 
       //we assume that no more motion is going to happen
       if(!lockLow && millis() - lowIn > pause){  
           //makes sure this block of code is only executed again after 
           //a new motion sequence has been detected
           lockLow = true;                        
           Spark.publish(MOTION_NOTIF, "Motion Ended",60, PRIVATE);
           delay(50);
           }
       }
  }
  
  int motion_notify_user()
{
    //send notification to user (this one goes to the dashboard)
    Spark.publish(MOTION_NOTIF, "Feel the force : Motion started!", 60, PRIVATE);

    //send push notification to user (this one goes to pushbullet servers)
    Spark.publish("pushbullet", "Feel the force!", 60, PRIVATE);
   
   return 0; 
}

Particle cloud webhook java script

JSON
{
  "eventName": "pushbullet",
  "url": "https://api.pushbullet.com/v2/pushes",
  "requestType": "POST",
  "headers": {
    "Authorization": "Bearer youraccesstoken",
    "Content-Type": "application/json"
  },
  "json": {
      "type": "note",
      "title": "{{SPARK_EVENT_VALUE}}",
      "body": ""
  },
  "mydevices": true
}

FeeltheForce

Particle photon and particle cloud code(Webhook script)

Credits

Rohit Rangwani

Rohit Rangwani

1 project • 4 followers
Experienced engineer interested in tech and neuroscience.

Comments

Related channels and tags
  • Environmental Sensing
  • Particle
  • Sensors