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Connor Thomas

Published November 25, 2019 © LGPL

IOT Group 23

An IOT device that measures the humidity and temperature of its surroundings

IntermediateFull instructions provided498

Things used in this project

Hardware components

Particle Argon

Breadboard (generic)

DHT11 Temperature & Humidity Sensor (4 pins)

USB-A to Micro-USB Cable

Jumper wires (generic)

Software apps and online services

ThingSpeak API

Particle Build Web IDE

Hand tools and fabrication machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Story

Intro

We ideated and created an IOT project that will allow us to know the temperature and humidity of the location where the Argon is located. Additionally, we will be able to track the changes in temperature and humidity over time and be alerted when the temperature drops below a certain level.

Project Overview

To accomplish this a DHT11 sensor and two particle argons were used. As a group we created an IOT project that measures and records the temperature and humidity of its surroundings. The Argon with the temperature sensor communicates the data obtained to a second argon. The second Argon then takes the data received and will turn its light on if the temperature is below the designated temperature which is currently set as 65 degrees Fahrenheit. If the second Argon finds the temperature to be below 65 degrees it will communicate to the temperature Argon to turn its light on.

First Argon

The first Argon has the temperature and humidity sensor (DH11) attached. The DH11 sensor sends the data obtained to the Argon. The Argon then publishes the data to the Particle website and sends the data to second Argon.

First Argon

Second Argon

The second Argon receives the data from the first Argon and analyzes the temperatures received. The second Argon compares the temperatures it receives with the preset temperature. If the temperature it below this value the argons light will stay on until the temperature rises above this value. Additionally, when the temperature is below this value the second Argon communicates to the first Argon to turn its light on. The code can easily be changed so the light will come on if the temperature rises above a certain temperature or if the temperature is within a certain range.

Second Argon

Video

Below is a video that explains the argon setup for the IOT project and gives a visual representation of the project in action.

Demonstration Video

ThingSpeak Live Temperature Example

Through ThingSpeak a live graph was created to show the data obtained from the DHT11 sensor. The graph below was obtained during the filming of the video above. The video started outside were the temperature was ~60 degrees before increasing dramatically near the open oven, and lastly leveling off at room temperature.

ThingSpeak Live Temperature Example

Code

  // 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/Adafruit_DHT.h"

// DHT parameters
#define DHTPIN 5
// Define the type of sensor used
#define DHTTYPE DHT11        // DHT 11 

const int tog = D7;
// Variables
int temperature;
int temp_f;
int Light_Position;
int humity;
int h;

TCPClient client;

unsigned long myChannelNumber = 919455;
const char * myWriteAPIKey = "1747UUCG6UC8T987";

// DHT sensor
DHT dht(DHTPIN, DHTTYPE);
void setup() {
    // Start DHT sensor
    ThingSpeak.begin(client);
    Serial.begin(9600);
    dht.begin();
    pinMode(tog, OUTPUT);
    digitalWrite(tog, LOW);
    Particle.subscribe("ConnorThomas4525", LightPosition, ALL_DEVICES);
}
void loop (){  
    if (Light_Position <= 0){
        digitalWrite(tog, LOW);
    }
    else if (Light_Position >= 1){
        digitalWrite(tog, HIGH);
    }
    else{
        
    }
    temperature = dht.getTempCelcius();
    humity = dht.getHumidity();
    h = humity;
     
    temp_f = (1.8)*(temperature) + 32;
    // Publish data
    Particle.publish("ChrisDymond526", String(temp_f), PUBLIC);

    Particle.publish("hChrisDymond526", String(h), PUBLIC);
   
    ThingSpeak.setField(1,temp_f);
    ThingSpeak.setField(2,h);
    
    Serial.println("temp_f");
    //Serial.println("h");
    ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);
    
    
    delay(4000);
    
    
}
void LightPosition(const char *events, const char *data){
    String pew = data;
    Light_Position = pew.toInt();
}

// 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 <LiquidCrystal.h>

#define DHTPIN D6

#define DHTTYPE DHT11


//DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal lcd(5, 4, 3, 2, 1, 0);



void setup() {

  lcd.clear();
  lcd.begin(16, 2);
  lcd.setCursor(0,0);
  lcd.print("Temp");
  lcd.setCursor(0,1);
  lcd.print("Humid");
  Particle.subscribe("ChrisDidThis1", f, ALL_DEVICES);
  Particle.subscribe("ChrisDidThisToo", h, ALL_DEVICES);
    // We open up a serial port to monitor the sensor values
    //Serial.begin(9600); 
   //Serial.println("DHT11 test!");

    //dht.begin();
}

void loop() {
    // Wait a few seconds between measurements.
    delay(2000);


    Particle.publish("XxConnor_TheGreatxX",PUBLIC);
}

    void f(const char *event, const char *data) {
    
    // Print the data over serial
    lcd.setCursor(6,0);
    lcd.print(data);
    lcd.setCursor(10,0);
    lcd.print("F     ");
    }
    
    void h(const char *event, const char *data) {
    
    lcd.setCursor(7,1);
    lcd.print(data);
    lcd.setCursor(11,1);
    lcd.print("%     ");
    }

Credits

Brett Dymond

1 project • 0 followers

Contact

IOT Group 23