Team IOT Project Group 45:

•

Ben Ziegler

Published November 23, 2021 © GPL3+

Grilled Cheese Telemetry System MEGR 3171 IOT Project

Have you ever wanted to track your Grilled Cheese sandwich? This solves all of your problems!

IntermediateFull instructions providedOver 2 days327

Grilled Cheese Telemetry System MEGR 3171 IOT Project

Things used in this project

Hardware components

Particle Argon

Breadboard (generic)

DHT11 Temperature & Humidity Sensor (4 pins)

Ultrasonic Sensor - HC-SR04 (Generic)

Jumper wires (generic)

Software apps and online services

Particle Build Web IDE

ThingSpeak API

Hand tools and fabrication machines

Grilled Cheese

Story

Introduction

For the Introduction to Measurement and Instrumentations class at UNC Charlotte, our group was instructed to design and implement an IOT project that either solves a problem or provides some sort of service. It must involve two Particle Argons that have two different types of sensors. Both also must be able to communicate with each other.

Thus we have created the Grilled Cheese Telemetry System. This system records the temperature, humidity, and distance from the grilled cheese by using both a temperature and humidity sensor (DHT-11) and an ultrasonic sensor (HC-SRO4). With the Grilled Cheese Telemetry System, you can keep your grilled cheese in check, ensure it doesn't get too soggy or cold, and ensure no one has moved it or stolen it.

How it Works

The first Argon controls the ultrasonic sensor. Every 20 seconds the ultrasonic sensor sends out an ultrasonic wave which bounces back into the sensor. The sensor then records the time the ultrasonic wave took to reflect and uses this to measure the distance away from the grilled cheese sandwich. The D2 LED will turn on once the Grilled Cheese is more than 10 centimeters from the ultrasonic sensor.

The second Argon controls the Temperature and Humidity sensor. Every 20 seconds the Temperature and Humidity Sensor records the temperature and humidity of the grilled cheese sandwich. This is done by making a small incision in the middle of the sandwich, and then inserting the sensor. The external D2 LED will turn on once the sensor determines the sandwich is approaching room temperature. This is done to warn the user that their sandwich is getting cold and should be eaten soon.

The D7 pins on the Argons have built-in LEDs, which turns on to show that they are connected using a Particle Subscribe function. This is to ensure the user that the system is on and functioning.

ThingSpeak Live Data

https://thingspeak.com/channels/1574528

Project YouTube Demonstration

Code

// This #include statement was automatically added by the Particle IDE.
#include <HC_SR04.h>
//the class we use to control the HC_SRO4 Ultrasonic Sensor
const String key = "2GUWASGKP5Y75M2F"; 
//the API key
double cm = 0.0;
double inches = 0.0;
//declaring the variables "cm" and "inches"
int trigPin = D4;
int echoPin = D5;
//setting up the pins as varibles
HC_SR04 rangefinder = HC_SR04(trigPin, echoPin, 5.0 , 300.0);
//this sets up the range of measurable distance for the HC_SRO4 rangefider
void myHandler(const char *event, const char *data) {
// Handle the integration response
}
void setup() 
{
    Spark.variable("cm", &cm, DOUBLE);
    Spark.variable("inches", &inches, DOUBLE);
    
    Particle.subscribe("hook-response/UltraSonicData", myHandler, MY_DEVICES);
    //subscribing the argon to hook response
    pinMode(D7, OUTPUT);
     pinMode(D2, OUTPUT);
    //use D7 LED as a measurable output
    Particle.subscribe ("TempFarenheight", cba);
}
void loop() 
{
    cm = rangefinder.getDistanceCM();
    inches = rangefinder.getDistanceInch();
    Particle.publish("UltraSonicData", +
            "{ \"1\": \"" + String(cm) + "\"," +
            "\"k\": \"" + key + "\" }", 60, PRIVATE, WITH_ACK);
    if (cm>10){
        digitalWrite(D2, HIGH);
    }
    else{
        digitalWrite(D2, LOW);
    }
    delay(20000);
    
    Serial.print("Distance: "); 
	Serial.print(cm);
	
	Particle.publish("Distance", String(cm));

}

void cba(const char *eventName, const char *data)
{ 
	digitalWrite(D7, HIGH);
 }

#include "Adafruit_DHT.h"

#define DHTPIN 3     // what pin we're connected to

#define DHTTYPE DHT11		// DHT 1

const String key = "5T0VR9511HQG5F5J"; 

DHT dht(DHTPIN, DHTTYPE);

void setup() {
    pinMode(D7, OUTPUT); 
    pinMode(D2, OUTPUT);
	Serial.begin(9600); 
	Serial.println("DHTxx test!");

	dht.begin();
	
 Particle.subscribe ("Distance", abc);

}

void loop() {

	delay(5000);

	float h = dht.getHumidity();
// Read temperature as Celsius
	delay(5000);
	float t = dht.getTempCelcius();
// Read temperature as Farenheit
	float f = dht.getTempFarenheit();

	Serial.print("Humid: "); 
	Serial.print(h);
	Serial.print("% - ");
	Serial.print("Temp: "); 
	Serial.print(t);
	Serial.print("*C ");
	Serial.print(f);
	Serial.print("*F ");

	
	
	Serial.print("*C - ");

	Serial.println("*C");
	Serial.println(Time.timeStr());
	
	Particle.publish("TempFarenheight", String(f));
	

	
	Particle.publish("HumidPercent", String(h));
	
    if (f<75.)
	{ digitalWrite(D2, HIGH);
	}
	else
	{ digitalWrite(D2, LOW);
	}

	
	 // Get some data

Particle.publish("thingSpeakWrite_All", +
     "{ \"1\": \"" + String(f) + "\"," +
       "\"2\": \"" + String(h) + "\"," +
       "\"k\": \"" + key + "\" }", 60, PRIVATE, WITH_ACK);
}

void abc(const char *eventName, const char *data)
{ 
	digitalWrite(D7, HIGH);



 }

Credits

Marcus Neacsu

1 project • 0 followers

Contact

Ben Ziegler

1 project • 0 followers

Contact

Thanks to DHT11 Sensor Interfacing with Particle Photon and Ultrasonic Sensor HC-SR04 Interfacing With Particle Photon.

Comments

Please log in or sign up to comment.

Grilled Cheese Telemetry System MEGR 3171 IOT Project