Description:-
- DHT11 VCC pin – 5V output of Arduino Uno
- OLED VCC pin – 5V output of Arduino Uno
- DHT11 GND pin – GND of Arduino Uno
- OLED GND pin – GND of Arduino Uno
- DHT11 Data pin – Digital pin 2 of Arduino Uno
- OLED SCL pin – Pin A4 of Arduino Uno
- OLED SDA pin – Pin A5 of Arduino Uno
Program:-
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHT.h"
#define DHTPIN 2
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
void setup() {
display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // initialize with the I2C addr 0x3C
display.display(); // show splash screen
delay(2000);
display.clearDisplay(); // clears the screen and buffer
dht.begin();
delay(2000);
}
void loop() {
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed.
if (isnan(h) || isnan(t) || isnan(f)) {
delay(2000);
}
else {
// routine for converting temp/hum floats to char arrays
char temp_buff[5]; char hum_buff[5];
char temp_disp_buff[11] = "Tmp:";
char hum_disp_buff[11] = "Hum:";
// appending temp/hum to buffers
dtostrf(t,2,1,temp_buff);
strcat(temp_disp_buff,temp_buff);
dtostrf(h,2,1,hum_buff);
strcat(hum_disp_buff,hum_buff);
// routine for displaying text for temp/hum readout
display.clearDisplay();
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0,0);
display.println(temp_disp_buff);
display.println(hum_disp_buff);
display.display();
delay(2000);
}
}
Functioning:-
- The pin that is attached to the OLED reset pin is defined by the Adafruit_SSD1306 display (OLED_RESET).
- The DHT sensor type and the pin that the data line is attached to are specified by DHT dht(DHTPIN, DHTTYPE).
- The DHT sensor and the OLED display are initialized with their I2C addresses (0x3C) in the setup() function.
- We continuously read the temperature and humidity values from the sensor and print them on the OLED display in the loop().
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| Functioning with circuit diagram |
Conclusion
- I hope you now have a better understanding of how the Arduino Uno and DHT11 temperature and humidity sensor function together. Moreover, regarding the Arduino Uno and SSD1306 OLED display integration. If you have any questions, don't hesitate to leave a remark below.
