Team MEGR 3171 Group 28: Joseph Wuori, Maxwell George, Nicholas Romero

Published November 24, 2019

MEGR 3171 Temperature Sensor Project

Temperature sensor built for the MEGR 3171 IoT project

IntermediateShowcase (no instructions)579

Things used in this project

Hardware components

Particle Argon

Resistor 10k ohm

DHT11 Temperature & Humidity Sensor (3 pins)

Adafruit Standard LCD - 16x2 White on Blue

Jumper wires (generic)

Single Turn Potentiometer- 10k ohms

Software apps and online services

Particle Build Web IDE

ThingSpeak API

Story

For the MEGR 3171 IoT project, the group decided to design and build a temperature and humidity sensor. This was chosen because the group felt it was important to know the temperature of a room, even when the owner was not present. This project extends to other applications such as cooking, which the project aids by allowing someone who is cooking to know the temperature of a stove without having to be in the room. This project works using a DHT11 temperature and humidity sensor to measure both temperature and humidity in a room. This data is then published to Thingspeak, where the data can be viewed in graph form so that trends in the data are more easily viewable.

Code

//Code Heavily Borrows from Professor MacAlpine's "useless machine" Code
int switchstate = 0; //a variable holding curr state
int lastswitchstate = 0; //prev star


int switchpin = D1; //input switch 
int ledpin = D7;  // We utilize the onboard LED

void setup() 
{
Particle.subscribe("GeorgeRomero", GeorgeRomeroRespond, MY_DEVICES); //when GeorgeRomero occurs in the cloud (viewable by console.particle.io) run the GeorgeRomeroRespond
pinMode(switchpin, INPUT_PULLUP);
pinMode(ledpin, OUTPUT);
}




void loop() {  //high freq loop
lastswitchstate = switchstate;  //puts prev switch state to current switch state
switchstate = digitalRead(D1);  //triggers when input goes from high to low 
if (switchstate == 0 && (lastswitchstate ==1)){ //if equal returns value of '1'
    Particle.publish("GeorgeRomero", PRIVATE);  //send the event to the particle cloud
    }

}

int GeorgeRomeroRespond(const char *topic, const char *data){ 
    digitalWrite(ledpin,HIGH); //blink the led for visual feedback
    digitalWrite(ledpin,LOW); //turn the led off
    delay(500);
}

// This #include statement was automatically added by the Particle IDE.
#include <ThingSpeak.h>

// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_DHT.h>

// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_DHT.h>

// This #include statement was automatically added by the Particle IDE.
#include <ThingSpeak.h>

#define DHTPIN  4

// Define the type of sensor
#define DHTTYPE DHT11        // DHT 11 

DHT dht(DHTPIN, DHTTYPE);
bool humid = false;
TCPClient client;


unsigned long myChannelNumber = 915641;
const char * myWriteAPIKey = "O2JM9AHA7YJ0XT02";


void setup() {
    
    ThingSpeak.begin(client);
 Serial.begin(9600); 
 dht.begin();

}

void loop() {
    // Wait a few seconds between measurements.
    delay(3000);
    
    float h = dht.getHumidity();
    
    // Read temperature as Fahrenheit
    float t = dht.getTempFarenheit();
    

        Particle.publish("GeorgeRomero", String (t), PUBLIC);
        Particle.publish("GeorgeRomero", String (h), PUBLIC);

        ThingSpeak.setField(1,h);
        ThingSpeak.setField(2,t);
        ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey); 
  
  Serial.print(dht.getHumidity());
  Serial.println("h");
  Serial.print(dht.getTempFarenheit());
  Serial.println("t");
}

// This #include statement was automatically added by the Particle IDE.
#include <ThingSpeak.h>

// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_DHT.h>

// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_DHT.h>

// This #include statement was automatically added by the Particle IDE.
#include <ThingSpeak.h>

#define DHTPIN  4

// Define the type of sensor
#define DHTTYPE DHT11        // DHT 11 

DHT dht(DHTPIN, DHTTYPE);
bool humid = false;
TCPClient client;


unsigned long myChannelNumber = 915641;
const char * myWriteAPIKey = "O2JM9AHA7YJ0XT02";


void setup() {
    
    ThingSpeak.begin(client);
 Serial.begin(9600); 
 dht.begin();

}

void loop() {
    // Wait a few seconds between measurements.
    delay(3000);
    
    float h = dht.getHumidity();
    
    // Read temperature as Fahrenheit
    float t = dht.getTempFarenheit();
    

        Particle.publish("GeorgeRomero", String (t), PUBLIC);
        Particle.publish("GeorgeRomero", String (h), PUBLIC);

        ThingSpeak.setField(1,h);
        ThingSpeak.setField(2,t);
        ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey); 
  
  Serial.print(dht.getHumidity());
  Serial.println("h");
  Serial.print(dht.getTempFarenheit());
  Serial.println("t");
}

MEGR 3171 Temperature Sensor Project

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Temperature

Sensor Circuit

LED Circuit

Temperature Sensor

LED

Particle Argon

Humidity

Code

Back and Forth

Temperature Sensor

LCD Code

Credits

Joseph Wuori

Maxwell George

Nicholas Romero

Comments

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MEGR 3171 Temperature Sensor Project

MEGR 3171 Temperature Sensor Project

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Temperature

Sensor Circuit

LED Circuit

Temperature Sensor

LED

Particle Argon

Humidity

Code

Back and Forth

Temperature Sensor

LCD Code

Credits

Joseph Wuori

Maxwell George

Nicholas Romero

Comments

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