Published November 24, 2021

MEGR 3171 IOT Project: Temperature Sensor with LCD Display

An easy particle argon setup that allows you to see the temperature of a room from any location, as well as receive notifications

IntermediateWork in progress5 hours207

MEGR 3171 IOT Project: Temperature Sensor with LCD Display

Things used in this project

Hardware components

Particle Argon

Breadboard (generic)

USB-A to Micro-USB Cable

Jumper wires (generic)

Single Turn Potentiometer- 10k ohms

Adafruit RGB Backlight LCD - 16x2

Temperature Sensor

Software apps and online services

IFTTT Maker service

Particle Build Web IDE

Google Sheets

Story

The purpose of this project was to use two-particle argon to read the temperature of a room in order to try and save money on heating and air conditioning. This was achieved by having one argon setup with a temperature sensor to read and collect data on the current temperature and by having the second argon setup with an LCD display so the current temperature could be seen easily. This allowed us to get the reading from the temperature sensor without having to be in the same room as it. The first step of the project was to build the circuit for each of the particle argon. One team member was responsible for building the LCD circuit and the other was responsible for the temperature sensor circuit. Once each circuit was built, both argon were moved to the same particle account. Having both particle argon on the same account is the only way to achieve two-way communication between the two of them. The particle argon controlling the LCD display was able to subscribe to the particle argon collecting data from the temperature sensor. This allowed for the current temperature to be outputted on the LCD display. The code to accomplish this was taken from several similar IoT projects on hackster and was modified to achieve our goal.

In addition to having the temperature displayed on the LCD, our project also utilized IFTTT (If This Then That) in order to receive phone notifications whenever the temperature goes above 73 degrees. This is very helpful in alerting us when to turn the heat or AC on or off. The changes in temperature over a period of time were collected using the particle and plotted on a graph as well. The plot can be seen below

Code

// Define the Pin the Temperature sensor is on
int tempPin = A0;

// Create a variable that will store the temperature value
double temperature = 0.0;
double temperatureF = 0.0;

void setup()
{
  // Register a Particle variable here
  Particle.variable("temperature", &temperature, DOUBLE);
  Particle.variable("temperatureF", &temperatureF, DOUBLE);  

  // Connect the temperature sensor to A0 and configure it
  // to be an input
  pinMode(tempPin, OUTPUT);
}

void loop()
{
  // Keep reading the sensor value so when we make an API
  // call to read its value, we have the latest one
  int reading = analogRead(tempPin);

  // The returned value from the device is going to be in the range from 0 to 4095
  // Calculate the voltage from the sensor reading
  double voltage = (reading * 3.3) / 4095.0;

  // Calculate the temperature and update our static variable
  temperature = (voltage - 0.5) * 100;

  // Now convert to Farenheight
  temperatureF = ((temperature * 9.0) / 5.0) + 32.0;
  // Sends the data to the other argon
 String sensorValues = "{Temp:" + String(temperatureF) + "}";
	digitalWrite(A0, HIGH);
	Particle.publish("SensorValues" , String(sensorValues));
    Particle.publish("SensorValues", PRIVATE);
    
	delay(10000);
	digitalWrite(A0, LOW);
	
	delay(10000);
}

#include <LiquidCrystal.h>
LiquidCrystal lcd(5, 4, 3, 2, 1, 0);
const int sensorPin = A0;

void setup() {
pinMode(A0, OUTPUT);

Particle.subscribe("SensorValues", toggleLed, MY_DEVICES);

Serial.begin(9600);
  lcd.begin(16, 2);

}

void loop() {
    int sensorVal = analogRead(sensorPin);
    float voltage = (sensorVal / 1024) * 5;
    float temperature = (voltage - 0.5) * 100;
    
    lcd.setCursor(0,0);
    lcd.print("Temp:         F  ");
    lcd.setCursor(6,0);
    lcd.print(temperature);
    delay(5000);

}

void toggleLed(const char *event, const char *data) {
    digitalWrite(A0, HIGH);
    delay(5000);
    digitalWrite(A0, LOW);
    delay(5000);
}

Credits

Samuel Kornmayer

1 project • 0 followers

Uriel Regalado

1 project • 0 followers

MEGR 3171 IOT Project: Temperature Sensor with LCD Display

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

If This Then That

Phone Notifications

Temperature Sensor Circuit Diagram

LCD Display Circuit Diagram

LCD Circuit (side view)

LCD Circuit (top view)

Temperature Sensor Circuit (top view)

Temperature Sensor Circuit (side view)

Code

Temperature Code

LCD Code

Credits

Samuel Kornmayer

Uriel Regalado

Comments

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MEGR 3171 IOT Project: Temperature Sensor with LCD Display

MEGR 3171 IOT Project: Temperature Sensor with LCD Display

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

If This Then That

Phone Notifications

Temperature Sensor Circuit Diagram

LCD Display Circuit Diagram

LCD Circuit (side view)

LCD Circuit (top view)

Temperature Sensor Circuit (top view)

Temperature Sensor Circuit (side view)

Code

Temperature Code

LCD Code

Credits

Samuel Kornmayer

Uriel Regalado

Comments

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