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Small green circuit board with white sensor filter and gold pins

Adafruit

Adafruit HTU21D-F Temperature Humidity Sensor Breakout Board Filtered Version

SKU CH-FRSG-5PERD

I2C digital humidity sensor breakout with filtered housing, 3.3 V regulator and level shifting

  • TypeSensors
  • I2C digital interface simplifies wiring
  • Filtered sensor housing keeps contaminants out
  • On-board 3.3 V regulator and level shifting enable direct 5 V logic connection
  • ±2 % typical humidity accuracy across 5 % to 95 % RH range
  • ±1 °C temperature accuracy from –30 °C to 90 °C

Ready-to-use humidity sensor breakout

The Adafruit HTU21D-F is a new I2C digital humidity and temperature sensor on a fully assembled breakout board. It suits makers, students and engineers who need reliable environmental data for weather stations, data loggers or HVAC monitoring. Some basic soldering is required to attach headers or wires before use.

Filtered sensing element for cleaner readings

The board includes the filtered version of the HTU21D-F chip, where a PTFE membrane protects the sensing element from dust and liquids while allowing vapour to pass. This keeps accuracy stable over time in workshops, greenhouses or outdoor enclosures where unfiltered sensors would degrade.

On-board regulation and level shifting included

A 3.3 V regulator and I2C level-shifting circuitry let the breakout connect directly to 5 V or 3.3 V microcontrollers without extra components. The board arrives fully tested so you can start logging temperature from -30 to 90 °C and humidity from 5 % to 95 % RH as soon as headers are soldered.

Highlights

  • I2C digital interface simplifies wiring
  • Filtered sensor housing keeps contaminants out
  • On-board 3.3 V regulator and level shifting enable direct 5 V logic connection
  • ±2 % typical humidity accuracy across 5 % to 95 % RH range
  • ±1 °C temperature accuracy from –30 °C to 90 °C

Specifications

TypeSensors

Questions about this item

What does the typical ±2 % humidity accuracy mean for my readings?

The sensor delivers ±2 % relative humidity accuracy across the 5 % to 95 % RH range; outside that span accuracy may degrade slightly.

How does the I²C interface limit the way I can connect this board?

I²C lets you run multiple sensors on the same two data lines, but total bus capacitance and cable length restrict practical runs to short distances.

What mounting holes or headers does the breakout provide for installation?

The board is supplied fully assembled with through-holes for standard pin headers so you can solder pins, wires or sockets for breadboard or panel use.

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