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libraries/Crowbits_DHT20/Crowbits_DHT20.h

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+#ifndef Crowbits_DHT20_H
+#define Crowbits_DHT20_H
+
+#include <Arduino.h>
+#include <string.h>
+#include <Wire.h>
+//#define ENABLE_DBG
+
+//#ifdef ENABLE_DBG
+//#define DBG(...) {Serial.print("[");Serial.print(__FUNCTION__); Serial.print("(): "); Serial.print(__LINE__); Serial.print(" ] "); Serial.println(__VA_ARGS__);}
+//#else
+//#define DBG(...)
+//#endif
+//extern Stream *dbg;
+class Crowbits_DHT20
+{
+public:
+  /*!
+   * @brief Construct the function
+   * @param pWire IC bus pointer object and construction device, can both pass or not pass parameters, Wire in default.
+   * @param address Chip IIC address, 0x38 in default.
+   */
+  Crowbits_DHT20(TwoWire *pWire = &Wire, uint8_t address = 0x38);
+
+  /**
+   * @brief init function
+   * @return Return 0 if initialization succeeds, otherwise return non-zero and error code.
+   */
+  int begin(void);
+    
+  /**
+   * @brief Get ambient temperature, unit: °C
+   * @return ambient temperature, measurement range: -40°C ~ 80°C
+   */
+  int getTemperature();
+    
+  /**
+   * @brief Get relative humidity, unit: %RH. 
+   * @return relative humidity, measurement range: 0-100%
+   */
+  int getHumidity();
+
+private:
+
+  /**
+   * @brief Write command into sensor chip 
+   * @param pBuf  Data included in command
+   * @param size  The number of the byte of command
+   */
+    void  writeCommand(const void *pBuf,size_t size);
+  /**
+   * @brief Write command into sensor chip 
+   * @param pBuf  Data included in command
+   * @param size  The number of the byte of command
+   * @return      Return 0 if the reading is done, otherwise return non-zero. 
+   */
+    uint8_t  readData(void *pBuf,size_t size);   
+    
+    TwoWire *_pWire;
+    uint8_t _address;
+  
+};
+
+#endif