Create AHT10.h

src/AHT10.h

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+/***************************************************************************************************/
+/*
+   This is an Arduino library for Aosong ASAIR AHT10, AHT15 Digital Humidity & Temperature Sensor
+
+   written by : enjoyneering79
+   sourse code: https://github.com/enjoyneering/
+
+
+   This chip uses I2C bus to communicate, specials pins are required to interface
+   Board:                                    SDA                    SCL                    Level
+   Uno, Mini, Pro, ATmega168, ATmega328..... A4                     A5                     5v
+   Mega2560................................. 20                     21                     5v
+   Due, SAM3X8E............................. 20                     21                     3.3v
+   Leonardo, Micro, ATmega32U4.............. 2                      3                      5v
+   Digistump, Trinket, ATtiny85............. 0/physical pin no.5    2/physical pin no.7    5v
+   Blue Pill, STM32F103xxxx boards.......... PB7                    PB6                    3.3v/5v
+   ESP8266 ESP-01........................... GPIO0/D5               GPIO2/D3               3.3v/5v
+   NodeMCU 1.0, WeMos D1 Mini............... GPIO4/D2               GPIO5/D1               3.3v/5v
+   ESP32.................................... GPIO21/D21             GPIO22/D22             3.3v
+
+   Frameworks & Libraries:
+   ATtiny  Core          - https://github.com/SpenceKonde/ATTinyCore
+   ESP32   Core          - https://github.com/espressif/arduino-esp32
+   ESP8266 Core          - https://github.com/esp8266/Arduino
+   STM32   Core          - https://github.com/stm32duino/Arduino_Core_STM32
+                         - https://github.com/rogerclarkmelbourne/Arduino_STM32
+
+   GNU GPL license, all text above must be included in any redistribution,
+   see link for details  - https://www.gnu.org/licenses/licenses.html
+*/
+/***************************************************************************************************/
+
+#ifndef AHT10_h
+#define AHT10_h
+
+#if defined(ARDUINO) && ((ARDUINO) >= 100) //arduino core v1.0 or later
+#include <Arduino.h>
+#else
+#include <WProgram.h>
+#endif
+
+#if defined(__AVR__)
+#include <avr/pgmspace.h>                  //for Arduino AVR PROGMEM support
+#elif defined(ESP8266)
+#include <pgmspace.h>                      //for Arduino ESP8266 PROGMEM support
+#elif defined(_VARIANT_ARDUINO_STM32_)
+#include <avr/pgmspace.h>                  //for Arduino STM32 PROGMEM support
+#endif
+
+#include <Wire.h>
+
+
+
+#define AHT10_ADDRESS_0X38         0x38  //chip I2C address 1, address pin connected to GND
+#define AHT10_ADDRESS_0X39         0x39  //chip I2C address 2, address pin connected to Vcc
+
+
+#define AHT10_INIT_CMD             0xE1  //initialization command
+#define AHT10_START_MEASURMENT_CMD 0xAC  //start measurment command
+#define AHT10_SOFT_RESET_CMD       0xBA  //soft reset command
+
+#define AHT10_INIT_NORMAL_MODE     0x00  //enable normal mode
+#define AHT10_INIT_CYCLE_MODE      0x20  //enable cycle mode
+#define AHT10_INIT_CMD_MODE        0x40  //enable command mode
+#define AHT10_INIT_CAL_ENABLE      0x08  //load factory calibration coeff
+
+
+#define AHT10_MEASURMENT_DELAY     75    //in milliseconds
+#define AHT10_COMMAND_DELAY        30    //in milliseconds
+#define AHT10_SOFT_RESET_DELAY     20    //in milliseconds
+
+#define AHT10_FORCE_READ_DATA      true  //force to read data
+#define AHT10_USE_READ_DATA        false //force to use data from previous read
+#define AHT10_ERROR                0xFF  //returns 255, if communication error is occurred
+
+
+class AHT10
+{
+  public:
+
+   AHT10(uint8_t address = AHT10_ADDRESS_0X38);
+
+   #if defined(ESP8266)
+   bool     begin(uint8_t sda = SDA, uint8_t scl = SCL);
+   #else
+   bool     begin();
+   #endif
+   uint8_t  readRawData();
+   float    readTemperature(bool readI2C = AHT10_FORCE_READ_DATA);
+   float    readHumidity(bool readI2C = AHT10_FORCE_READ_DATA);
+   bool     softReset();
+   bool     setNormalMode();
+   bool     setCycleMode();
+
+  private:
+   uint8_t  _address;
+   uint8_t  _rawDataBuffer[6] = {AHT10_ERROR, 0, 0, 0, 0, 0};
+
+   uint8_t  readStatusByte();
+   uint8_t  getCalibrationBit(bool readI2C = AHT10_FORCE_READ_DATA);
+   bool     enableFactoryCalCoeff();
+   uint8_t  getBusyBit(bool readI2C = AHT10_FORCE_READ_DATA);
+};
+
+#endif