Adafruit HTU31 Temperature Humidity Sensor Breakout Board Engineering Development Tool

Breakout board for environmental sensing

The Adafruit HTU31 breakout board provides an I2C digital sensor for temperature and relative humidity measurements. It is designed for engineers, hobbyists and students who need a compact development tool for environmental monitoring projects. The board serves as an accurate and intelligent alternative to common DHT-series sensors.

Typical accuracy across the operating range

The sensor delivers a typical accuracy of ±2% relative humidity across 20% to 100% at a temperature range of 0 to 70°C. Temperature output accuracy is ±0.2°C from 0 to 100°C. Operation outside the specified humidity range is still possible, though accuracy may drop slightly. The on-board heater can be toggled to evaporate condensation on the sensing element.

Thermal isolation for stable readings

A thermal-isolation cut-out on the board reduces the influence of nearby circuitry heat on measurements. This design helps maintain consistent sensor performance during sustained operation. The controllable heater function manages condensation without adding continuous thermal load to the sensing element. Power draw remains minimal for typical low-power applications.