Displaying Temperature and Humidity on an LCD

Integrate this easy-to-use DHT11 temperature and humidity sensor into your weather station, drone, weather balloon, or greenhouse.

Jul 19, 2019

•

64231 views

•

11 respects

weather

environmental sensing

Apps and platforms

Arduino IDE

Project description

Code

Display data on 20x4 LCD

arduino

1//Interface the DHT11 Temp & Humidity sensor and display humidity and  temperature
2//in Celsius, Fahrenheit, and Kelvin on a 20x4 character LCD
3
4#include  <dht.h>
5#include <LiquidCrystal.h>
6
7//variable declarations
8dht DHT;
9double  tempF = 0;
10double tempK = 0;
11const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6  = 6, D7 = 7;
12
13LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that  are connected to LCD, 4-bit mode
14
15void setup() {
16  lcd.begin(20,4);    //set  20 columns and 4 rows of 16x2 LCD
17
18}
19
20void loop() {
21  int readDHT  = DHT.read11(8);      //grab the 40-bit data packet from DHT sensor
22
23  tempF  = DHT.temperature*9/5 + 32;   //convert temp to Fahrenheit
24  tempK = DHT.temperature  + 273.15;   //convert temp to Kelvin
25  lcd.print("Temp: ");
26  lcd.print(DHT.temperature);     //display temp in C on LCD
27  lcd.print("C");
28
29  lcd.setCursor(0,1);
30  lcd.print("Temp: ");
31  lcd.print(tempF);     //display temp in F on LCD
32  lcd.print("F");
33
34  lcd.setCursor(0,2);
35  lcd.print("Temp: ");
36  lcd.print(tempK);     //display temp in Kelvin on LCD
37  lcd.print("K");
38    
39  lcd.setCursor(0,3);
40  lcd.print("Humidity: ");
41  lcd.print(DHT.humidity);
42  lcd.print("%");
43  lcd.setCursor(0,0);
44  delay(2000); 
45
46}

//Interface the DHT11 Temp & Humidity sensor and display humidity and  temperature
//in Celsius, Fahrenheit, and Kelvin on a 20x4 character LCD

#include  <dht.h>
#include <LiquidCrystal.h>

//variable declarations
dht DHT;
double  tempF = 0;
double tempK = 0;
const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6  = 6, D7 = 7;

LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that  are connected to LCD, 4-bit mode

void setup() {
  lcd.begin(20,4);    //set  20 columns and 4 rows of 16x2 LCD

}

void loop() {
  int readDHT  = DHT.read11(8);      //grab the 40-bit data packet from DHT sensor

  tempF  = DHT.temperature*9/5 + 32;   //convert temp to Fahrenheit
  tempK = DHT.temperature  + 273.15;   //convert temp to Kelvin
  lcd.print("Temp: ");
  lcd.print(DHT.temperature);     //display temp in C on LCD
  lcd.print("C");

  lcd.setCursor(0,1);
  lcd.print("Temp: ");
  lcd.print(tempF);     //display temp in F on LCD
  lcd.print("F");

  lcd.setCursor(0,2);
  lcd.print("Temp: ");
  lcd.print(tempK);     //display temp in Kelvin on LCD
  lcd.print("K");
    
  lcd.setCursor(0,3);
  lcd.print("Humidity: ");
  lcd.print(DHT.humidity);
  lcd.print("%");
  lcd.setCursor(0,0);
  delay(2000); 

}

Display data on 16x2 LCD

arduino

1//Interface the DHT11 Temp & Humidity sensor and display humidity and  temperature
2//in Celsius on a 16x2 character LCD
3
4#include <dht.h>
5#include  <LiquidCrystal.h>
6
7dht DHT;
8const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6  = 6, D7 = 7;
9LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that are  connected to LCD, 4-bit mode
10
11void setup() {
12  lcd.begin(16,2);    //set  16 columns and 2 rows of 16x2 LCD
13
14}
15
16void loop() {
17  int readDHT  = DHT.read11(8);    //grab 40-bit data packet from DHT sensor
18  lcd.setCursor(0,0);  
19  lcd.print("Temp: ");
20  lcd.print(DHT.temperature);
21  //lcd.print((char)223);         //used to display degree symbol on display
22  //lcd.write(0xdf);              //another  way to display degree symbol
23  lcd.print("C");
24  lcd.setCursor(0,1);
25  lcd.print("Humidity: ");
26  lcd.print(DHT.humidity);
27  lcd.print("%");
28  delay(3000);
29
30}

//Interface the DHT11 Temp & Humidity sensor and display humidity and  temperature
//in Celsius on a 16x2 character LCD

#include <dht.h>
#include  <LiquidCrystal.h>

dht DHT;
const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6  = 6, D7 = 7;
LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that are  connected to LCD, 4-bit mode

void setup() {
  lcd.begin(16,2);    //set  16 columns and 2 rows of 16x2 LCD

}

void loop() {
  int readDHT  = DHT.read11(8);    //grab 40-bit data packet from DHT sensor
  lcd.setCursor(0,0);  
  lcd.print("Temp: ");
  lcd.print(DHT.temperature);
  //lcd.print((char)223);         //used to display degree symbol on display
  //lcd.write(0xdf);              //another  way to display degree symbol
  lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print("Humidity: ");
  lcd.print(DHT.humidity);
  lcd.print("%");
  delay(3000);

}

Display data on 16x2 LCD

arduino

1//Interface the DHT11 Temp & Humidity sensor and display humidity and
2  temperature
3//in Celsius on a 16x2 character LCD
4
5#include <dht.h>
6#include
7  <LiquidCrystal.h>
8
9dht DHT;
10const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6
11  = 6, D7 = 7;
12LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that are
13  connected to LCD, 4-bit mode
14
15void setup() {
16  lcd.begin(16,2);    //set
17  16 columns and 2 rows of 16x2 LCD
18
19}
20
21void loop() {
22  int readDHT
23  = DHT.read11(8);    //grab 40-bit data packet from DHT sensor
24  lcd.setCursor(0,0);
25  
26  lcd.print("Temp: ");
27  lcd.print(DHT.temperature);
28  //lcd.print((char)223);
29         //used to display degree symbol on display
30  //lcd.write(0xdf);              //another
31  way to display degree symbol
32  lcd.print("C");
33  lcd.setCursor(0,1);
34
35  lcd.print("Humidity: ");
36  lcd.print(DHT.humidity);
37  lcd.print("%");
38
39  delay(3000);
40
41}

//Interface the DHT11 Temp & Humidity sensor and display humidity and
  temperature
//in Celsius on a 16x2 character LCD

#include <dht.h>
#include
  <LiquidCrystal.h>

dht DHT;
const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6
  = 6, D7 = 7;
LiquidCrystal lcd(RS,EN,D4,D5,D6,D7);   //set Uno pins that are
  connected to LCD, 4-bit mode

void setup() {
  lcd.begin(16,2);    //set
  16 columns and 2 rows of 16x2 LCD

}

void loop() {
  int readDHT
  = DHT.read11(8);    //grab 40-bit data packet from DHT sensor
  lcd.setCursor(0,0);
  
  lcd.print("Temp: ");
  lcd.print(DHT.temperature);
  //lcd.print((char)223);
         //used to display degree symbol on display
  //lcd.write(0xdf);              //another
  way to display degree symbol
  lcd.print("C");
  lcd.setCursor(0,1);

  lcd.print("Humidity: ");
  lcd.print(DHT.humidity);
  lcd.print("%");

  delay(3000);

}

Downloadable files

Wiring LCD and DHT11 to Arduino Uno

Comments

Only logged in users can leave comments

toastghost1767

a year ago

this code should work #include <DHT.h> #include <LiquidCrystal.h> const int RS = 2, EN = 3, D4 = 4, D5 = 5, D6 = 6, D7 = 7; LiquidCrystal lcd(RS, EN, D4, D5, D6, D7); #define DHTPIN 8 // Define the pin where your DHT11 sensor is connected #define DHTTYPE DHT11 // Define the type of DHT sensor DHT dht(DHTPIN, DHTTYPE); void setup() { lcd.begin(16, 2); dht.begin(); // Initialize the DHT sensor } void loop() { delay(2000); // Wait for a few seconds between measurements float temperature = dht.readTemperature(); // Read temperature in Celsius float humidity = dht.readHumidity(); // Read humidity lcd.clear(); // Clear the LCD display lcd.setCursor(0, 0); lcd.print("Temp: "); lcd.print(String(temperature, 1)); // Displays temperature with 1 decimal place lcd.print("C"); lcd.setCursor(0, 1); lcd.print("Humidity: "); lcd.print(String(humidity, 1)); // Displays humidity with 1 decimal place lcd.print("%"); }

Anonymous user

2 years ago

Hi! Is there any way to show the time instead of the Kelvin temperature? Thanks!

Herbman33

2 years ago

I have an error in the code. "dht DHT;" errors with 'dht' does not name a type. I am lost

Anonymous user

2 years ago

the <dht.h> script part is invalid for me. I made my own script for it in python3.9 that works but that's it.

Anonymous user

4 years ago

This is perfect for what I am going to need. Thank you . Felix C

Anonymous user

6 years ago

Hi! Is there any way to show the time instead of the Kelvin temperature? Thanks!

ejshea

2 Followers

•

17 Projects

Intro

Apps and platforms

Project description

Code

Downloadable files