Arduino.ru

#include <stdint.h>
#include <math.h>
#include <Arduino.h>
#include <Wire.h>
#include "Thinary_AHT10.h"

// Specify the constants for water vapor and barometric pressure.
#define WATER_VAPOR 17.62f
#define BAROMETRIC_PRESSURE 243.5f

Sensor_CMD eSensorCalibrateCmd[3] = {0xE1, 0x08, 0x00};
Sensor_CMD eSensorNormalCmd[3]    = {0xA8, 0x00, 0x00};
Sensor_CMD eSensorMeasureCmd[3]   = {0xAC, 0x33, 0x00};
Sensor_CMD eSensorResetCmd        = 0xBA;
boolean    GetRHumidityCmd        = true;
boolean    GetTempCmd             = false;

/******************************************************************************
 * Global Functions
 ******************************************************************************/
AHT10Class::AHT10Class() {
}

boolean AHT10Class::begin(unsigned char _AHT10_address)
{
    AHT10_address = _AHT10_address;
    Serial.begin(9600);
    Serial.println("\x54\x68\x69\x6E\x61\x72\x79\x20\x45\x6C\x65\x74\x72\x6F\x6E\x69\x63\x20\x41\x48\x54\x31\x30\x20\x4D\x6F\x64\x75\x6C\x65\x2E");
    Wire.begin(AHT10_address);
    Wire.beginTransmission(AHT10_address);
    Wire.write(eSensorCalibrateCmd, 3);
    Wire.endTransmission();
    Serial.println("https://thinaryelectronic.aliexpress.com");
    delay(500);
    if((readStatus()&0x68) == 0x08)
        return true;
    else
    {
        return false;
    }
    
}

/**********************************************************
 * GetHumidity
 *  Gets the current humidity from the sensor.
 *
 * @return float - The relative humidity in %RH
 **********************************************************/
float AHT10Class::GetHumidity(void)
{
    float value = readSensor(GetRHumidityCmd);
    if (value == 0) {
        return 0;                       // Some unrealistic value
    }
    return value * 100 / 1048576;
}

/**********************************************************
 * GetTemperature
 *  Gets the current temperature from the sensor.
 *
 * @return float - The temperature in Deg C
 **********************************************************/
float AHT10Class::GetTemperature(void)
{
    float value = readSensor(GetTempCmd);
    return ((200 * value) / 1048576) - 50;
}

/**********************************************************
 * GetDewPoint
 *  Gets the current dew point based on the current humidity and temperature
 *
 * @return float - The dew point in Deg C
 **********************************************************/
float AHT10Class::GetDewPoint(void)
{
  float humidity = GetHumidity();
  float temperature = GetTemperature();

  // Calculate the intermediate value 'gamma'
  float gamma = log(humidity / 100) + WATER_VAPOR * temperature / (BAROMETRIC_PRESSURE + temperature);
  // Calculate dew point in Celsius
  float dewPoint = BAROMETRIC_PRESSURE * gamma / (WATER_VAPOR - gamma);

  return dewPoint;
}

/******************************************************************************
 * Private Functions
 ******************************************************************************/

unsigned long AHT10Class::readSensor(boolean GetDataCmd)
{
    unsigned long result, temp[6];

    Wire.beginTransmission(AHT10_address);
    Wire.write(eSensorMeasureCmd, 3);
    Wire.endTransmission();
    delay(100);

    Wire.requestFrom(AHT10_address, 6);

    for(unsigned char i = 0; Wire.available() > 0; i++)
    {
        temp[i] = Wire.read();
    }   

    if(GetDataCmd)
    {
        result = ((temp[1] << 16) | (temp[2] << 8) | temp[3]) >> 4;
    }
    else
    {
        result = ((temp[3] & 0x0F) << 16) | (temp[4] << 8) | temp[5];
    }

    return result;
}

unsigned char AHT10Class::readStatus(void)
{
    unsigned char result = 0;

    Wire.requestFrom(AHT10_address, 1);
    result = Wire.read();
    return result;
}

void AHT10Class::Reset(void)
{
    Wire.beginTransmission(AHT10_address);
    Wire.write(eSensorResetCmd);
    Wire.endTransmission();
    delay(20);
}

unsigned long AHT10Class::readSensor(boolean GetDataCmd)
{
    unsigned long result, temp[6], timer;
if ((millis() -timer) > 100)
    {
    Wire.beginTransmission(AHT10_address);
    Wire.write(eSensorMeasureCmd, 3);
    Wire.endTransmission();
    timer = millis();
    }

    Wire.requestFrom(AHT10_address, 6);

    for(unsigned char i = 0; Wire.available() > 0; i++)
    {
        temp[i] = Wire.read();
    }