{"title":"Adafruit Sensirion SHT40 Temperature  Humidity Sensor - STEMMA QT / Qwiic","handle":"adafruit-sensirion-sht40-temperature-humidity-sensor-stemma-qt-qwiic","url":"/products/adafruit-sensirion-sht40-temperature-humidity-sensor-stemma-qt-qwiic","description":"The Adafruit Sensirion SHT40 is a high-accuracy temperature and humidity sensor featuring a true I2C interface for simple two-wire communication. Part of the fourth generation of Sensirion's acclaimed SHT sensor family, it delivers excellent measurement precision in a compact, easy-to-use breakout.\n\nThe breakout includes a voltage regulator and level shifting, making it compatible with both 3.3 V and 5 V systems. STEMMA QT / Qwiic connectors allow solderless hookup, and Arduino and CircuitPython libraries are available for quick integration.\n\nKey Features\n\n\nRelative Humidity Accuracy – ±1.8% RH typical (25–75% RH)\n\nTemperature Accuracy – ±0.2 °C typical (0–75 °C)\n\nOperating Range – 0–100% RH, −40 to +125 °C; fully functional in condensing environments\n\nTrue I2C Interface – Address 0x44, fast mode plus with CRC checksum\n\nUltra-Low Power – 0.4 µA average at 1 Hz measurement rate, 80 nA idle\n\nVariable Power Heater – Built-in heater for defogging and self-testing\n\n3.3 V / 5 V Compatible – Onboard voltage regulator and level shifting\n\nSTEMMA QT / Qwiic Connectors – Solderless I2C connection and daisy-chaining\n\nNIST Traceable – Calibrated with NIST traceability; JEDEC JESD47 qualified\n\n\nIdeal For\n\nEnvironmental monitoring and weather stations\nHVAC and climate control systems\nIndoor air quality and comfort monitoring\nData logging and scientific experiments\n\n\nPackage Contents\n\n1× Adafruit Sensirion SHT40 Temperature & Humidity Sensor Breakout\n1× Header strip (soldering required for breadboard use)\n\n\n\nNote: STEMMA QT / Qwiic cable is not included. Use a compatible JST SH cable for solderless connection, or solder directly to the header pads.\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":3451,"title":"Default Title","sku":"AF-4885","price":12.14,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":12,"option1":"Default Title"}]}