AHT10 Temperature and Humidity Sensor Easy to Use Great for Beginners

				
					#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// Define OLED resolution (0.96-inch I2C OLED fixed 128×64)
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
// OLED I2C address (ZJY_M2420 default: 0x3C, change to 0x3D if screen is black)
#define OLED_ADDR     0x3C

// Initialize OLED object
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// AHT10 sensor I2C address (fixed 0x38, no need to modify)
#define AHT10_ADDR 0x38

// Store temperature and humidity data
float temperature = 0.0;
float humidity = 0.0;

void setup() {
  Wire.begin();         // Initialize I2C bus (SDA=A4, SCL=A5)
  Serial.begin(9600);   // Serial debugging (optional, view data via serial monitor)

  // Initialize OLED screen
  if(!display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR)) {
    Serial.println(F("OLED initialization failed!"));
    for(;;); // Halt if initialization fails, easy to troubleshoot
  }
  display.clearDisplay(); // Clear screen
  display.setTextColor(SSD1306_WHITE); // Set text color (OLED only black/white, fixed white)

  // Initialize AHT10 sensor
  aht10_init();
  delay(200); // Sensor power-on stable delay
}

void loop() {
  // Read AHT10 temperature and humidity data
  aht10_read(&temperature, &humidity);

  // Display data on OLED screen
  display_show(temperature, humidity);

  // Serial print data (for debugging, can be deleted)
  Serial.print("Temperature: ");
  Serial.print(temperature, 1);
  Serial.print(" °C\t");
  Serial.print("Humidity: ");
  Serial.print(humidity, 1);
  Serial.println(" %RH");

  delay(1000); // Refresh every 1 second
}

/************************ AHT10 initialization function ************************/
void aht10_init() {
  Wire.beginTransmission(AHT10_ADDR);
  Wire.write(0xBE);       // AHT10 initialization command
  Wire.write(0x08);       // Calibration enable
  Wire.write(0x00);
  Wire.endTransmission();
  delay(20);
}

/************************ Read AHT10 temperature and humidity data ************************/
void aht10_read(float *temp, float *humi) {
  // Send measurement command
  Wire.beginTransmission(AHT10_ADDR);
  Wire.write(0xAC);       // Trigger measurement command
  Wire.write(0x33);
  Wire.write(0x00);
  Wire.endTransmission();
  delay(80); // Wait for measurement completion (at least 75ms)

  // Read 6 bytes of data
  Wire.requestFrom(AHT10_ADDR, 6);
  if (Wire.available() == 6) {
    uint8_t byte1 = Wire.read();
    uint8_t byte2 = Wire.read();
    uint8_t byte3 = Wire.read();
    uint8_t byte4 = Wire.read();
    uint8_t byte5 = Wire.read();
    uint8_t byte6 = Wire.read();

    // Calculate humidity: raw data to percentage (strictly match AHT10 datasheet)
    *humi = ((uint32_t)byte2 << 12) | ((uint32_t)byte3 << 4) | (byte4 >> 4);
    *humi = (*humi * 100.0) / 0x100000;

    // Calculate temperature: raw data to Celsius (strictly match AHT10 datasheet)
    *temp = (((uint32_t)(byte4 & 0x0F) << 16) | ((uint32_t)byte5 << 8) | byte6);
    *temp = (*temp * 200.0) / 0x100000 - 50.0;
  }
}

/************************ OLED display temperature and humidity interface ************************/
void display_show(float temp, float humi) {
  display.clearDisplay(); // Clear screen to avoid text overlap

  // 1. Display title (centered, enlarged font)
  display.setTextSize(2);          // Font size: 2x (1=smallest,8=largest)
  display.setCursor(18, 0);        // Coordinate(x,y): x=18 for center, y=0 for top
  display.print("Temp&Humi");

  // 2. Display temperature data (1x font, with unit)
  display.setTextSize(1);
  display.setCursor(10, 30);
  display.print("Temp: ");
  display.print(temp, 1);          // Keep 1 decimal place for tidiness
  display.print(" C");

  // 3. Display humidity data (1x font, with unit)
  display.setCursor(10, 50);
  display.print("Humi: ");
  display.print(humi, 1);
  display.print(" %");

  display.display(); // Refresh screen and show cached content
}