Arduino Nano DHT22 LCD 16x2 I2C temp and humidity display

Desktop temp and humid sensor

Aug 26, 2021

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monitoring

Devices & Components

Arduino Nano

lcd 16x2 I2c module

DHT22 Temperature Sensor

Hardware & Tools

Soldering iron (generic)

Breadboard, 830 Tie Points

Software & Tools

Arduino IDE

Project description

Code

c_cpp

Most of the code is taken from https://create.arduino.cc/projecthub/adrakhmat/temperature-monitor-with-dht22-and-i2c-16x2-lcd-3ddd39 It needs the DHT, WIRE and I2C libraries This also display if F not C, replace line 63 with "temp" instead of "tempF" for C and change line 64

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 the DHT22 Data is connected to
15#define DHTTYPE DHT22   //  DHT 22  (AM2302)
16DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal  16mhz Arduino
17
18
19LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27,  16 column and 2 rows
20
21//Variables
22int chk;
23float hum;  //Stores humidity  value
24float temp; //Stores temperature value
25float tempF;
26void setup()
27{
28  lcd.init(); // initialize the lcd
29  lcd.backlight();
30
31  lcd.setCursor(0,  0);         // move cursor to   (0, 0)
32  lcd.print("Arduino");        // print  message at (0, 0)
33  lcd.setCursor(2, 1);         // move cursor to   (2, 1)
34  lcd.print("Booting Up"); // print message at (2, 1)
35  Serial.begin(9600);
36  dht.begin();
37  lcd.begin(16,2);
38  lcd.init(); // initialize the lcd
39  lcd.backlight();
40}
41
42void loop()
43{
44  
45  delay(2000);
46  //Read  data and store it to variables hum and temp
47  hum = dht.readHumidity();
48  temp  = dht.readTemperature();
49  tempF = ((temp * 1.8) + 32);
50  //Print temp and  humidity values to serial monitor
51  Serial.print("Humidity: ");
52  Serial.print(hum);
53  Serial.print(" %, Temp: ");
54  Serial.print(temp);
55  Serial.println("  Celsius");
56  //Print temp and humidity values to LCD
57  lcd.setCursor(0,0);
58  lcd.print("Humidity: ");
59  lcd.print(hum);
60  lcd.print("%");
61  lcd.setCursor(0,1);
62  lcd.print("Temp: "); 
63  lcd.print(tempF);
64  lcd.println("Fahrenheit");
65  delay(2000); //Delay 2 sec between temperature/humidity check
66
67
68}

/* 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 the DHT22 Data is connected to
#define DHTTYPE DHT22   //  DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal  16mhz Arduino


LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27,  16 column and 2 rows

//Variables
int chk;
float hum;  //Stores humidity  value
float temp; //Stores temperature value
float tempF;
void setup()
{
  lcd.init(); // initialize the lcd
  lcd.backlight();

  lcd.setCursor(0,  0);         // move cursor to   (0, 0)
  lcd.print("Arduino");        // print  message at (0, 0)
  lcd.setCursor(2, 1);         // move cursor to   (2, 1)
  lcd.print("Booting Up"); // print message at (2, 1)
  Serial.begin(9600);
  dht.begin();
  lcd.begin(16,2);
  lcd.init(); // initialize the lcd
  lcd.backlight();
}

void loop()
{
  
  delay(2000);
  //Read  data and store it to variables hum and temp
  hum = dht.readHumidity();
  temp  = dht.readTemperature();
  tempF = ((temp * 1.8) + 32);
  //Print temp and  humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(hum);
  Serial.print(" %, Temp: ");
  Serial.print(temp);
  Serial.println("  Celsius");
  //Print temp and humidity values to LCD
  lcd.setCursor(0,0);
  lcd.print("Humidity: ");
  lcd.print(hum);
  lcd.print("%");
  lcd.setCursor(0,1);
  lcd.print("Temp: "); 
  lcd.print(tempF);
  lcd.println("Fahrenheit");
  delay(2000); //Delay 2 sec between temperature/humidity check


}

Code

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 the DHT22 Data is connected to
15#define DHTTYPE DHT22   //   DHT 22  (AM2302)
16DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal   16mhz Arduino
17
18
19LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27,   16 column and 2 rows
20
21//Variables
22int chk;
23float hum;  //Stores humidity   value
24float temp; //Stores temperature value
25float tempF;
26void setup()
27{
28   lcd.init(); // initialize the lcd
29  lcd.backlight();
30
31  lcd.setCursor(0,   0);         // move cursor to   (0, 0)
32  lcd.print("Arduino");        // print   message at (0, 0)
33  lcd.setCursor(2, 1);         // move cursor to   (2, 1)
34   lcd.print("Booting Up"); // print message at (2, 1)
35  Serial.begin(9600);
36   dht.begin();
37  lcd.begin(16,2);
38  lcd.init(); // initialize the lcd
39   lcd.backlight();
40}
41
42void loop()
43{
44  
45  delay(2000);
46  //Read   data and store it to variables hum and temp
47  hum = dht.readHumidity();
48  temp   = dht.readTemperature();
49  tempF = ((temp * 1.8) + 32);
50  //Print temp and   humidity values to serial monitor
51  Serial.print("Humidity: ");
52  Serial.print(hum);
53   Serial.print(" %, Temp: ");
54  Serial.print(temp);
55  Serial.println("   Celsius");
56  //Print temp and humidity values to LCD
57  lcd.setCursor(0,0);
58   lcd.print("Humidity: ");
59  lcd.print(hum);
60  lcd.print("%");
61  lcd.setCursor(0,1);
62   lcd.print("Temp: "); 
63  lcd.print(tempF);
64  lcd.println("Fahrenheit");
65   delay(2000); //Delay 2 sec between temperature/humidity check
66
67
68}

/* 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 the DHT22 Data is connected to
#define DHTTYPE DHT22   //   DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE); //// Initialize DHT sensor for normal   16mhz Arduino


LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27,   16 column and 2 rows

//Variables
int chk;
float hum;  //Stores humidity   value
float temp; //Stores temperature value
float tempF;
void setup()
{
   lcd.init(); // initialize the lcd
  lcd.backlight();

  lcd.setCursor(0,   0);         // move cursor to   (0, 0)
  lcd.print("Arduino");        // print   message at (0, 0)
  lcd.setCursor(2, 1);         // move cursor to   (2, 1)
   lcd.print("Booting Up"); // print message at (2, 1)
  Serial.begin(9600);
   dht.begin();
  lcd.begin(16,2);
  lcd.init(); // initialize the lcd
   lcd.backlight();
}

void loop()
{
  
  delay(2000);
  //Read   data and store it to variables hum and temp
  hum = dht.readHumidity();
  temp   = dht.readTemperature();
  tempF = ((temp * 1.8) + 32);
  //Print temp and   humidity values to serial monitor
  Serial.print("Humidity: ");
  Serial.print(hum);
   Serial.print(" %, Temp: ");
  Serial.print(temp);
  Serial.println("   Celsius");
  //Print temp and humidity values to LCD
  lcd.setCursor(0,0);
   lcd.print("Humidity: ");
  lcd.print(hum);
  lcd.print("%");
  lcd.setCursor(0,1);
   lcd.print("Temp: "); 
  lcd.print(tempF);
  lcd.println("Fahrenheit");
   delay(2000); //Delay 2 sec between temperature/humidity check


}

Downloadable files

schematic

Arduino schematic Nano LCD I2c 5v VCC gnd gnd A4 SDA A5 SCL nano DHT22 3.3v + Data D4 (it says D2 in the schematic I couldnt change it) gnd -

schematic

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