DHT11 Temperature and Humidity Readings in OLED Display

 Circuit Diagram :- 

Code :-

//Prateek //www.prateeks.in #include <Wire.h> #include <Adafruit_GFX.h> #include <Adafruit_SSD1306.h> #include <Adafruit_Sensor.h> #include <DHT.h> #define SCREEN_WIDTH 128 // OLED display width, in pixels #define SCREEN_HEIGHT 64 // OLED display height, in pixels // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins) Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1); #define DHTPIN D3 // Digital pin connected to the DHT sensor // Uncomment the type of sensor in use: #define DHTTYPE DHT11 // DHT 11 //#define DHTTYPE DHT22 // DHT 22 (AM2302) //#define DHTTYPE DHT21 // DHT 21 (AM2301) DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(115200); dht.begin(); if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { Serial.println(F("SSD1306 allocation failed")); for(;;); } delay(2000); display.clearDisplay(); display.setTextColor(WHITE); } void loop() { delay(5000); //read temperature and humidity float t = dht.readTemperature(); float h = dht.readHumidity(); if (isnan(h) || isnan(t)) { Serial.println("Failed to read from DHT sensor!"); } // clear display display.clearDisplay(); // display temperature display.setTextSize(1); display.setCursor(0,0); display.print("Temperature: "); display.setTextSize(2); display.setCursor(0,10); display.print(t); display.print(" "); display.setTextSize(1); display.cp437(true); display.write(167); display.setTextSize(2); display.print("C"); // display humidity display.setTextSize(1); display.setCursor(0, 35); display.print("Humidity: "); display.setTextSize(2); display.setCursor(0, 45); display.print(h); display.print(" %"); display.display(); }