【Arduino 动手做】由ESP32C3驱动的 MCU 制成的小型便携袖珍温度计 简单

#include <Wire.h>
#include <AHTxx.h>


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

#define OLED_WIDTH 128
#define OLED_HEIGHT 32

#define OLED_ADDR   0x3C
Adafruit_SSD1306 display(OLED_WIDTH, OLED_HEIGHT);



float ahtValue;                               //to store T/RH result

AHTxx aht10(AHTXX_ADDRESS_X38, AHT1x_SENSOR); //sensor address, sensor type


void setup()
{
  #if defined(ESP8266)
  WiFi.persistent(false);  //disable saving wifi config into SDK flash area
  WiFi.forceSleepBegin();  //disable AP & station by calling "WiFi.mode(WIFI_OFF)" & put modem to sleep
  #endif

  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
  display.clearDisplay();

  Serial.begin(115200);
  Serial.println();
  
  while (aht10.begin() != true) //for ESP-01 use aht10.begin(0, 2);
  {
    Serial.println(F("AHT1x not connected or fail to load calibration coefficient")); //(F()) save string to flash & keeps dynamic memory free

    delay(5000);
  }

  Serial.println(F("AHT10 OK"));

  //Wire.setClock(400000); //experimental I2C speed! 400KHz, default 100KHz
}


void loop()
{
  /* DEMO - 1, every temperature or humidity call will read 6-bytes over I2C, total 12-bytes */
  Serial.println();
  Serial.println(F("DEMO 1: read 12-bytes"));

  ahtValue = aht10.readTemperature(); //read 6-bytes via I2C, takes 80 milliseconds

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(30, 0);
  display.println(F("Temp-"));

//  Serial.print(F("Temperature...: "));
  
  if (ahtValue != AHTXX_ERROR) //AHTXX_ERROR = 255, library returns 255 if error occurs
  {

  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(35, 25);
  display.println(ahtValue);
  display.display();
//    Serial.print(ahtValue);
   
  }
  else
  {
    printStatus(); //print temperature command status

    if   (aht10.softReset() == true) Serial.println(F("reset success")); //as the last chance to make it alive
    else                             Serial.println(F("reset failed"));
  }

  delay(2000); //measurement with high frequency leads to heating of the sensor, see NOTE

  ahtValue = aht10.readHumidity(); //read another 6-bytes via I2C, takes 80 milliseconds

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(30, 0);
  display.println(F("Humd-"));
  
  
//  Serial.print(F("Humd-"));
  
  if (ahtValue != AHTXX_ERROR) //AHTXX_ERROR = 255, library returns 255 if error occurs
  {

  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(35, 25);
  display.println(ahtValue);
  display.display();
    
    
 //   Serial.println(F(" +-2%"));
  }
  else
  {
    printStatus(); //print humidity command status
  }

  delay(2000); //measurement with high frequency leads to heating of the sensor, see NOTE

  /* DEMO - 2, temperature call will read 6-bytes via I2C, humidity will use same 6-bytes */
  Serial.println();
  Serial.println(F("DEMO 2: read 6-byte"));

  ahtValue = aht10.readTemperature(); //read 6-bytes via I2C, takes 80 milliseconds

  Serial.print(F("Temperature: "));
  
  if (ahtValue != AHTXX_ERROR) //AHTXX_ERROR = 255, library returns 255 if error occurs
  {
    Serial.print(ahtValue);
    Serial.println(F(" +-0.3C"));
  }
  else
  {
    printStatus(); //print temperature command status
  }

  ahtValue = aht10.readHumidity(AHTXX_USE_READ_DATA); //use 6-bytes from temperature reading, takes zero milliseconds!!!

  Serial.print(F("Humidity...: "));
  
  if (ahtValue != AHTXX_ERROR) //AHTXX_ERROR = 255, library returns 255 if error occurs
  {
    Serial.print(ahtValue);
    Serial.println(F(" +-2%"));
  }
  else
  {
    printStatus(); //print temperature command status not humidity!!! RH measurement use same 6-bytes from T measurement
  }

  delay(10000); //recomended polling frequency 8sec..30sec
}

void printStatus()
{
  switch (aht10.getStatus())
  {
    case AHTXX_NO_ERROR:
      Serial.println(F("no error"));
      break;

    case AHTXX_BUSY_ERROR:
      Serial.println(F("sensor busy, increase polling time"));
      break;

    case AHTXX_ACK_ERROR:
      Serial.println(F("sensor didn't return ACK, not connected, broken, long wires (reduce speed), bus locked by slave (increase stretch limit)"));
      break;

    case AHTXX_DATA_ERROR:
      Serial.println(F("received data smaller than expected, not connected, broken, long wires (reduce speed), bus locked by slave (increase stretch limit)"));
      break;

    case AHTXX_CRC8_ERROR:
      Serial.println(F("computed CRC8 not match received CRC8, this feature supported only by AHT2x sensors"));
      break;

    default:
      Serial.println(F("unknown status"));    
      break;
  }
}