Arduino Nano DHT22 LCD 16x2 I2C temp and humidity display

Desktop temp and humid sensor

Aug 26, 2021

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monitoring

Components and supplies

Arduino Nano R3

lcd 16x2 I2c module

DHT22 Temperature Sensor

Tools and machines

Soldering iron (generic)

Breadboard, 830 Tie Points

Apps and platforms

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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