Arduino DTH22 Humidity Temperature With LCD I2C 16x2 Display

Check the humidity & temperature of your terrarium with a DTH22 humidity and temperature sensor and display this on an LCD I2C 16x2 display.

Feb 25, 2017

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environmental sensing

home automation

monitoring

pets

Components and supplies

Male/Female Jumper Wires

9V battery (generic)

9V battery clip with 5.5mm/2.1mm plug

Male/Male Jumper Wires

DHT22 Temperature Sensor

White on Blue 16×2 LCD Module with I2C Backpack Module – 5V

Solderless Breadboard Full Size

USB-A to Mini-USB Cable

Arduino UNO

Project description

Code

hygroThermo.ino

c_cpp

1/* How to use the DHT-22 sensor with Arduino uno
2   Temperature and  humidity sensor
3   More info: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
4   Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com 
5*/
6
7//Libraries
8#include  <DHT.h>
9#include <Wire.h> 
10#include <LCD.h>
11#include <LiquidCrystal_I2C.h>
12
13//Constants
14#define  DHTPIN 4     // what pin we're connected to
15#define DHTTYPE DHT22   // DHT 22  (AM2302)
16DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz  Arduino
17
18//ALWAYS USE THIS WITH LCD I2C and Addres 0x3F
19#define I2C_ADDR  0x3F
20#define BACKLIGHT_PIN 3
21#define En_pin 2
22#define Rw_pin 1
23#define  Rs_pin 0
24#define D4_pin 4
25#define D5_pin 5
26#define D6_pin 6
27#define  D7_pin 7
28LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
29
30//Variables
31int  chk;
32float hum;  //Stores humidity value
33float temp; //Stores temperature  value
34
35void setup()
36{
37  Serial.begin(9600);
38  dht.begin();
39  lcd.begin(16,2);
40  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
41  lcd.setBacklight(HIGH);
42}
43
44void  loop()
45{
46  
47  delay(2000);
48  //Read data and store it to variables hum  and temp
49  hum = dht.readHumidity();
50  temp = dht.readTemperature();
51  //Print  temp and humidity values to serial monitor
52  Serial.print("Humidity: ");
53  Serial.print(hum);
54  Serial.print(" %, Temp: ");
55  Serial.print(temp);
56  Serial.println(" Celsius");
57
58  lcd.clear();
59  lcd.setCursor(0,0);
60  lcd.print("Temp: ");
61  lcd.print(temp);
62  lcd.print(" ");
63  lcd.print((char)223);
64  lcd.print("C");
65  lcd.setCursor(0,1);
66  lcd.print("Hum:  ");
67  lcd.print(hum);
68  lcd.print(" %");
69
70  delay(2000); //Delay 2 sec.
71
72}
73

/* How to use the DHT-22 sensor with Arduino uno
   Temperature and  humidity sensor
   More info: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
   Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com 
*/

//Libraries
#include  <DHT.h>
#include <Wire.h> 
#include <LCD.h>
#include <LiquidCrystal_I2C.h>

//Constants
#define  DHTPIN 4     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz  Arduino

//ALWAYS USE THIS WITH LCD I2C and Addres 0x3F
#define I2C_ADDR  0x3F
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define  Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define  D7_pin 7
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

//Variables
int  chk;
float hum;  //Stores humidity value
float temp; //Stores temperature  value

void setup()
{
  Serial.begin(9600);
  dht.begin();
  lcd.begin(16,2);
  lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
}

void  loop()
{
  
  delay(2000);
  //Read data and store it to variables hum  and temp
  hum = dht.readHumidity();
  temp = dht.readTemperature();
  //Print  temp and humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(hum);
  Serial.print(" %, Temp: ");
  Serial.print(temp);
  Serial.println(" Celsius");

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print(" ");
  lcd.print((char)223);
  lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print("Hum:  ");
  lcd.print(hum);
  lcd.print(" %");

  delay(2000); //Delay 2 sec.

}

hygroThermo.ino

c_cpp

1/* How to use the DHT-22 sensor with Arduino uno
2   Temperature and   humidity sensor
3   More info: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
4    Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com 
5*/
6
7//Libraries
8#include   <DHT.h>
9#include <Wire.h> 
10#include <LCD.h>
11#include <LiquidCrystal_I2C.h>
12
13//Constants
14#define   DHTPIN 4     // what pin we're connected to
15#define DHTTYPE DHT22   // DHT 22   (AM2302)
16DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz   Arduino
17
18//ALWAYS USE THIS WITH LCD I2C and Addres 0x3F
19#define I2C_ADDR   0x3F
20#define BACKLIGHT_PIN 3
21#define En_pin 2
22#define Rw_pin 1
23#define   Rs_pin 0
24#define D4_pin 4
25#define D5_pin 5
26#define D6_pin 6
27#define   D7_pin 7
28LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
29
30//Variables
31int   chk;
32float hum;  //Stores humidity value
33float temp; //Stores temperature   value
34
35void setup()
36{
37  Serial.begin(9600);
38  dht.begin();
39  lcd.begin(16,2);
40   lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
41  lcd.setBacklight(HIGH);
42}
43
44void   loop()
45{
46  
47  delay(2000);
48  //Read data and store it to variables hum   and temp
49  hum = dht.readHumidity();
50  temp = dht.readTemperature();
51  //Print   temp and humidity values to serial monitor
52  Serial.print("Humidity: ");
53   Serial.print(hum);
54  Serial.print(" %, Temp: ");
55  Serial.print(temp);
56   Serial.println(" Celsius");
57
58  lcd.clear();
59  lcd.setCursor(0,0);
60   lcd.print("Temp: ");
61  lcd.print(temp);
62  lcd.print(" ");
63  lcd.print((char)223);
64   lcd.print("C");
65  lcd.setCursor(0,1);
66  lcd.print("Hum:  ");
67  lcd.print(hum);
68   lcd.print(" %");
69
70  delay(2000); //Delay 2 sec.
71
72}
73

/* How to use the DHT-22 sensor with Arduino uno
   Temperature and   humidity sensor
   More info: http://www.ardumotive.com/how-to-use-dht-22-sensor-en.html
    Dev: Michalis Vasilakis // Date: 1/7/2015 // www.ardumotive.com 
*/

//Libraries
#include   <DHT.h>
#include <Wire.h> 
#include <LCD.h>
#include <LiquidCrystal_I2C.h>

//Constants
#define   DHTPIN 4     // what pin we're connected to
#define DHTTYPE DHT22   // DHT 22   (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal 16mhz   Arduino

//ALWAYS USE THIS WITH LCD I2C and Addres 0x3F
#define I2C_ADDR   0x3F
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define   Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define   D7_pin 7
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);

//Variables
int   chk;
float hum;  //Stores humidity value
float temp; //Stores temperature   value

void setup()
{
  Serial.begin(9600);
  dht.begin();
  lcd.begin(16,2);
   lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
  lcd.setBacklight(HIGH);
}

void   loop()
{
  
  delay(2000);
  //Read data and store it to variables hum   and temp
  hum = dht.readHumidity();
  temp = dht.readTemperature();
  //Print   temp and humidity values to serial monitor
  Serial.print("Humidity: ");
   Serial.print(hum);
  Serial.print(" %, Temp: ");
  Serial.print(temp);
   Serial.println(" Celsius");

  lcd.clear();
  lcd.setCursor(0,0);
   lcd.print("Temp: ");
  lcd.print(temp);
  lcd.print(" ");
  lcd.print((char)223);
   lcd.print("C");
  lcd.setCursor(0,1);
  lcd.print("Hum:  ");
  lcd.print(hum);
   lcd.print(" %");

  delay(2000); //Delay 2 sec.

}

Downloadable files

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