Materials Used

Wiring Instructions

LCD: RS=7, E=8, D4-D7=9-12, GND=RW/VSS/GND, 5V=VCC
DHT Sensor: DATA=Pin 2, VCC=5V, GND=GND

Project Photos & Diagram

Arduino Code

// Temperature OLED Display
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1

#define DHTPIN 2
#define DHTTYPE DHT22

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
}

void loop() {
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  display.clearDisplay();

  display.setTextSize(2);
  display.setCursor(0, 0);
  display.println("Temp:");
  display.print(temperature);
  display.println(" C");

  display.setTextSize(2);
  display.setCursor(0, 35);
  display.println("Humid:");
  display.print(humidity);
  display.println(" %");

  display.display();

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  delay(2000);
}

🔧 Troubleshooting

OLED display not working? Try these fixes:

What You Learned