Reference

Library

Download the DFRobot Arduino SHT3x library

How to install Libraries in Arduino IDE

Communication Protocol Description

• Interface Type: Serial (I2C non standard)

API Description

• Constructor: DFRobot_SHT3x(pWire = &Wire, address = 0x45, RST = 4)
  Construct the function.

  • pWire: I2C bus pointer object and construction device, Wire in default.
  • address: Chip I2C address, two optional addresses 0x44 and 0x45 (0x45 in default).
  • RST: Chip reset pin, 4 in default.
  • Note: I2C address is determined by the pin addr on the chip. When ADR is connected to VDD, address is 0x45; when connected to GND, address is 0x44.

• begin(): Initialize the chip. Returns 0 if successful, otherwise returns non-0.

• readSerialNumber(): Read the serial number of the chip. Returns 32-digit serial number.

• softReset(): Send command resets via I2C, enter the chip's default mode (single-measure mode), turn off the heater, and clear the alert of the ALERT pin. Returns true if successful.

• heaterEnable(): Turn on the heater inside the chip to enable the sensor get correct humidity value in wet environments. Returns true if successful. Note: Heaters should be used in wet environments; other cases will result in incorrect readings.

• getTemperatureC(): Get the measured temperature (℃). Returns float temperature data.

• getTemperatureF(): Get the measured temperature (℉). Returns float temperature data.

• getHumidityRH(): Get the measured humidity (%RH). Returns float humidity data.

• readTemperatureAndHumidity(repeatability): Get temperature and humidity data in single measurement mode.

  • repeatability: Set repeatability to read temperature and humidity data with the type eRepeatability_t. Optional parameters:
    • eRepeatability_High: Humidity repeatability 0.10%RH, temperature repeatability 0.06°C.
    • eRepeatability_Medium: Humidity repeatability 0.15%RH, temperature repeatability 0.12°C.
    • eRepeatability_Low: Humidity repeatability 0.25%RH, temperature repeatability 0.24°C.
  • Returns a structure containing celsius temperature (°C), Fahrenheit temperature (°F), relative humidity (%RH), and status code. Return 0 indicates valid data.

Principle

The metallic mesh covering the sensor adopts method of infiltering copper during sintering to enhance the temperature resistance, pressure resistance, and wearing resistance of it. The 2-wire serial interface and internal voltage regulation allows for easy and fast system integration.

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