Created January 28, 2020 © GPL3+

Humidity and Temperature Measurement using Arduino

In this project, we are going to calculate the surrounding temperature and humidity and the same will display it on a 16x2 LCD screen.

Intermediate12

Humidity and Temperature Measurement using Arduino

Things used in this project

Hardware components

Arduino UNO

DHT11 Temperature & Humidity Sensor (4 pins)

Adafruit RGB Backlight LCD - 16x2

Software apps and online services

Arduino IDE

Story

About Project

A mixed temperature and humidity sensor DHT11 is utilized with Arduino uno to develop this project.

Working of this project depends on single-wire serial communication. The first Arduino transmits a start signal to DHT module and then DHT presents a response signal including temperature and humidity data. Arduino gathers and removes in two parts one is humidity and the second one is temperature and then sends them to 16x2 LCD.

In this project, we have utilized a sensor module DHT11. The DHT11 sensor module is a linked module for sensing humidity and temperature which presents a calibrated digital output signal.

DHT11 delivers us a specific value of humidity and temperature and assures high security and long term immobility. DHT11 module operates on serial communication. This module transfers data in the form of the pulse train of specific time period. Before sending data to Arduino it requires some initialize command with a time delay. And the whole process time is about 4ms. Entire data transmission is of 40-bit and data format of this process is given below:

Complete Process
Firstly, Arduino sends a high to low start signal to DHT11 with 18µs delay. And then Arduino pull-up the data line and waits for 20-40µs for DHT’s response (as shown below). Once DHT recognizes starts signal, it will send a low voltage level response signal to Arduino of time delay about 80µs. After that DHT controller pulls up the data line and holds it for 80µs for DHT’s arranging of transmitting data.

When a data bus is at a low voltage level which means that DHT11 is transmitting a response signal. Once it is done, DHT again presents a data line pull-up for 80µs for preparing data transmission.

The data format that is transmitting by DHT to Arduino for every bit starts with 50µs low voltage level and length of high voltage level signal defines whether a data bit is “0” or “1”.

IoT Training Online will help you to implement such techniques practically in various IoT applications.

Run a program

#include<dht.h>      // Including library for dht
#include<LiquidCrystal.h>
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);

#define dht_dpin 12 

dht DHT;

byte degree[8] = 
              {
                0b00011,
                0b00011,
                0b00000,
                0b00000,
                0b00000,
                0b00000,
                0b00000,
                0b00000
              };

void setup()
{
 lcd.begin(16, 2);
 lcd.createChar(1, degree);
 lcd.clear();
 lcd.print("   Humidity   ");
 lcd.setCursor(0,1);
 lcd.print("  Measurement ");
 delay(2000);
 lcd.clear();
 lcd.print("Circuit Digest ");
 delay(2000);
}

void loop()
{
  DHT.read11(dht_dpin);
  lcd.setCursor(0,0);
  lcd.print("Humidity: ");
  lcd.print(DHT.humidity);   // printing Humidity on LCD
  lcd.print(" %");
  lcd.setCursor(0,1);
  lcd.print("Temperature:");
  lcd.print(DHT.temperature);   // Printing temperature on LCD
  lcd.write(1);
  lcd.print("C");
  delay(500);
}

Credits

hIOTron

78 projects • 2 followers

hIOTron is an internet of things based company that offers an IoT Platform, products, IoT Solutions, and IoT Training.

Humidity and Temperature Measurement using Arduino

Things used in this project

Hardware components

Software apps and online services

Story

Code

Run a program

Credits

hIOTron

Comments

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Humidity and Temperature Measurement using Arduino

Humidity and Temperature Measurement using Arduino

Things used in this project

Hardware components

Software apps and online services

Story

Code

Run a program

Credits

hIOTron

Comments

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