Adafruit Industries HTU21D-F User Manual (English)

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You can try breathing on the sensor to increase the humidity. The sensor reacts very fast!

Library Reference

The library we have is simple and easy to use

You can create the Adafruit_HTU21DF object with:

Adafruit_HTU21DF htu = Adafruit_HTU21DF()

There are no pins to set since you must use the I2C bus!

Then initialize the sensor with:

htu.begin()

this function returns True if the sensor was found and responded correctly and False if it

was not found

Once initialized, you can query the temperature in °C with

htu.readTemperature()

Which will return floating point (decimal + fractional) temperature. You can convert to

Fahrenheit by multiplying by 1.8 and adding 32 as you have learned in grade school!

https://learn.adafruit.com/adafruit-htu21d-f-temperature-humidity-

sensor

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Adafruit Industries HTU21D-F Specifications

General

Sensor Type	Digital Humidity and Temperature Sensor
Communication Interface	I2C
Operating Voltage	1.5V to 3.6V
Temperature Accuracy	±0.3°C (at 25°C)
Temperature Range	-40 to +125°C
Humidity Range	0 to 100 %RH
Humidity Accuracy	±2% RH
Response Time (humidity)	8 seconds