{"title":"Adafruit Si7021 Temperature  Humidity Sensor Breakout Board","handle":"adafruit-si7021-temperature-humidity-sensor-breakout-board","url":"/products/adafruit-si7021-temperature-humidity-sensor-breakout-board","description":"The Adafruit Si7021 is a temperature and humidity sensor from Silicon Labs with a PTFE filter for protection against dust and contaminants. It provides ±3% relative humidity accuracy over 0–80% RH and ±0.4 °C temperature accuracy from −10 to +85 °C, all communicated over a simple I2C interface.\n\nThe breakout includes a 3.3 V regulator and level shifting, making it compatible with both 3.3 V and 5 V power and logic. Some light soldering is required to attach the included header.\n\nKey Features\n\n\nRelative Humidity Accuracy – ±3% RH (0–80% RH range)\n\nTemperature Accuracy – ±0.4 °C (−10 to +85 °C range)\n\nPTFE Filter – Protects the sensor from dust while allowing accurate humidity readings\n\nI2C Interface – Simple two-wire communication\n\n3.3 V / 5 V Compatible – Onboard voltage regulator and level shifting\n\n\nAlso Consider\n\n\nSHT40 Sensor – Newer Sensirion sensor with ±1.8% RH accuracy and STEMMA QT connectors\n\nSHT45 Sensor – Highest precision with ±1.0% RH and ±0.1 °C accuracy\n\n\nIdeal For\n\nEnvironmental monitoring and weather stations\nHVAC and climate control systems\nIndoor comfort monitoring\nData logging projects\n\n\nPackage Contents\n\n1× Adafruit Si7021 Temperature & Humidity Sensor Breakout (with PTFE filter)\n1× Header strip (soldering required)\n\n\nResources\n\nAdafruit Si7021 Guide (Arduino & CircuitPython)\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":12236,"title":"Default Title","sku":"AF-3251","price":20.02,"on_sale":false,"in_stock":true,"available_quantity":100,"option1":"Default Title"}]}