HYT939 Industrial Grade Humidity and Temperature Sensor ±1.8%RH ±0.2°C

  • Calibrated and Temperature Compensated
  • High Chemical Resistance
  • Wide Humidity and Temperature Range
  • Interchangeable without Adjustments
  • Industrial/Laboratory Grade Sensor
  • 0x28 I2C Start Address


This sensor is not for everyone because of it's high cost, but if you need the best of the best Temperature and Humidity Sensor money can buy, look no further as few sensors can compare to this gem. Precisely calibrated, the HYT939 delivers an accuracy of ±1.8 % RH and ±0.2 °C. Integrated signal processing is used for measuring the physical parameters of relative humidity and temperature using a convenient I2C interface.

Features include:

  • easy interchangeability without adjustment
  • mechanical robustness, chemical resistance,
  • dew formation resistance and
  • long-term stability.

Both the linearity error and temperature drift are corrected on-chip through computation. Because of the special robust construction, the sensor also withstands peak loading at high temperatures.

This device is ideal for:

  • medical systems, a
  • utoclaves,
  • pressure dew point measurement,
  • drying systems, and
  • laboratories.


This is a general purpose I²C device compatible with all computing platforms and IoT technologies, including Raspberry Pi, BeagleBone, Arduino, Particle, BridgeX5, and many more.  All ControlEverything.com devices support a strict +5V I²C Bus standard.

Arduino Nano and Micro Interfaces:
Plug this Device into the Arduino Nano I²C Shield
Plug this Device into any Arduino Nano Master Device
Plug this Device into any Arduino Micro Master Device
Plug this Device into the Arduino Uno Interface Adapter

ESP8266 IoT Interfaces:
Use our ESP8266 Module and the PEI2C Interface Adapter
Use our ESP8266 Adapters for Adafruit and Huzzah

Onion Omega 1 & 2 IoT Interface:
Use our Onion Omega Adapters

Raspberry Pi Interfaces:
Use the Raspberry Pi I²C Interface Adapter
Use the Raspberry Pi 2/3 I²C Interface Adapter
Use the Raspberry Pi Zero I²C Interface Adapter

Particle IoT Interfaces: 
Plug this Device into the Particle Photon I²C Shield
Use as Expansion for any Particle Photon Device
Use as Expansion for any Particle Electron Device
Note: All devices above are compatible with Bluz Bluetooth Interface

Pycom IoT Interface:
Plug this Device into the WiPy I²C Shield

BeagleBone Interface:
Use the BeagleBone I²C Interface Adapter

Windows 8/10 PC Interface:
Use the Bridge Series Controller

Mini Modules

Our mini modules provide a standardized footprint to simplify the design of your project, and allow for a smaller form factor without sacrificing the plug-and-play  ease of use that our product line affords.

All I²C Mini Modules are designed to operate at 5VDC. Using a convenient quick connect 4-Pin plug, devices can be daisy-chained onto the I²C Bus, eliminating the need for soldering. Simply plug together the devices you need for your next automation application.

Pull-up resistors are included with all ControlEverything.com master devices. If you are wiring in your own I²C port, on-board 4.7K jumper-selectable pull-up resistors are available for convenience purposes.

All mini modules are 50.8 x 31.75 mm.


Dimensions: 50.80000 x 31.75000 x 15.24000 mm
Mechanical drawing
Wiring diagram


Code Libraries

Community Libraries