{"title":"Adafruit HTS221 - Temperature & Humidity Sensor Breakout Board","handle":"adafruit-hts221-temperature-humidity-sensor-breakout-board","url":"/products/adafruit-hts221-temperature-humidity-sensor-breakout-board","description":"The Adafruit HTS221 is an affordable I²C/SPI temperature and humidity sensor breakout board from ST. It measures relative humidity from 0–100% RH with 3.5% accuracy (in the 20–80% range) and temperature from -40 to 120°C with ±0.5°C accuracy (between 15 and 40°C). An excellent choice for everyday environmental monitoring applications.\n\nThe breakout includes STEMMA QT / Qwiic connectors for solderless I²C hookup, along with standard header pins for breadboard use. On-board level shifting and a voltage regulator make it compatible with both 3.3V and 5V microcontrollers.\n\nKey Features\n\n\n0–100% Relative Humidity Range – 0.004% sensitivity, 3.5% accuracy (20–80% RH)\n\n-40 to 120°C Temperature Range – 0.016°C resolution, ±0.5°C accuracy (15–40°C)\n\nI²C and 3-Wire SPI Interfaces – Flexible connectivity options\n\nSTEMMA QT / Qwiic Connectors – Solderless I²C connection, compatible with SparkFun Qwiic\n\n3.3V and 5V Compatible – On-board level shifting and voltage regulation\n\nArduino and CircuitPython Libraries – Ready-to-use driver support with example code\n\n\nIdeal For\n\nIndoor climate and environmental monitoring\nGreenhouse and mushroom farming humidity tracking\nWeather station projects\nBeginner-friendly sensor projects with solderless STEMMA QT connection\n\n\nPackage Contents\n\n1× Adafruit HTS221 Breakout Board – Assembled and tested with STEMMA QT connectors\n1× Header strip (unsoldered)\n\n\n\nNote: STEMMA QT / Qwiic cable not included. Header strip requires light soldering if using with a breadboard.\n\n\nResources\n\nAdafruit HTS221 Learn Guide\nWhat is STEMMA QT?\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":2976,"title":"Default Title","sku":"AF-4535","price":20.02,"on_sale":false,"in_stock":true,"available_quantity":24,"option1":"Default Title"}]}