Arduino library for Sensirion temperature and humidity sensors SHT30, SHT31 & SHT35.

Check for /examples for examples of different use cases.

The datasheet I followed is: https://sensirion.com/media/documents/213E6A3B/63A5A569/Datasheet_SHT3x_DIS.pdf

The constructor structure:

SHT3x(	int Address = 0x44, //I2C device address, 0x44 or 0x45
                ValueIfError Value = Zero, //What to return in case of errors. Zero or PrevValue
                uint8_t HardResetPin = 255, //Number of pin RESET connected to (input from 100 to 255 if not used)
                SHT3xSensor SensorType = SHT30, //Sensor type, SHT30, SHT31 or SHT35.
                SHT3xMode Mode=Single_HighRep_ClockStretch //Operation mode , look for "enum SHT3xMode"
                ); 

Supports:

• Temperature data at Celsius, Kelvin and Fahrenheit scales.
• Relative humidity data.
• Absolute humidity data at Torr, mm Hg, Pa, bar, technical and standard atmosphere, psi scales.
• Data integrity (by CRC8 algorithm) (datasheet/section 4.12).
• Temperature, relative and absolute humidity tolerances (in dependence from measured values)
• Calibration (linear) of temperature and humidity data by factors or by reverse sensor values (2 points)
• Heater On/Off (integrated to SHT3x sensor) (datasheet/section 4.10)
• Different sensor actions modes (datasheet/section 4.3)
• Reset: soft (I2C) and hard (by corresponding pin) (datasheet/section 4.9)

Do not supports:

• Action in periodic mode (datasheet/section 4.5)
• Interrupts (datasheet/section 3.5)
• Aler mode

Warning

Wire1/2 support updated. Your code may change since SDA pin usage removed.

For using with Wire1/Wire2 #define BEFORE importing library:

#define SHT_Wire_1 //For Wire1
//OR (not both)
#define SHT_Wire_2 //For Wire2
#include <SHT3x.h>

Wire is used by default

• Note 1: by default, the data from sensor updates not faster, than 2 times a second. For faster update use SetUpdateInterval(uint32_t UpdateIntervalMillisec); but do not exceed the datasheet values (10 measurments per second (100 ms)) because of sensor self-heating (datasheet/section 4.5, at the end of Table 9)

• Note 2: The sensor type affects the tolerance values only.