SENSIRION SHT4x is a 4th generation, high-accuracy, ultra-low-power, Relative Humidity and Temperature digital sensor platform for measuring relative humidity and temperature at different accuracy classes. Its utilized using I2C interface that provides several pre-configured I2C addresses and maintains an ultra-low power budget. The power-trimmed internal heater can be used at three heating levels thus enabling sensor operation in demanding environments. The SHT4X is suitable for automation, wearable devices, indoor monitoring, and lab equipment devices. for more reading please refer to the datasheet located below.

Requirements and Alternatives

  • Arduino IDE | PlatformIO
  • Test Boards :
    • Note: The Diagram below is using ATMEGA328TQFP / ATMEGA4809. (please refer to each MCU’s respective pin-outs & bus configuration)
  • Resistors (See below diagram for required values)
  • Capacitor(See below diagram for required values)

Wiring Guide

The below diagram is the typical application configuration for SHT4X, after reaching the minimal voltage supply and allowing for the maximal power-up time of 1 millisecond the sensor is initialized and ready to read the data out from the i2C communication protocol.

Test Source Code

The test code below will initialize the digital signal and translate into relative humidity and temperature readings.


  • Download SHT4X  (SHT Sensor Code Library) – ZIP
  • Download SHT4X Datasheet – PDF
Wiring SHT4X / SEK-SVM40 / SEK-SVM4X ULP 16bit Relative Temperature Sensor

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