Adafruit Sensirion SHT45 Precision Temperature & Humidity Sensor - STEMMA QT / Qwiic

The SHT45 sensor is the fourth generation temperature and humidity sensor from Sensirion with an excellent ±1.0% typical relative humidity accuracy from 25 to 75% and ±0.1°C typical accuracy from 0 to 75 °C.

Unlike some earlier SHT sensors, this sensor has a true I2C interface for easy interfacing with only two wires (plus power and ground!). Thanks to the voltage regulator and level shifting circuitry Adafruit included on the breakout It is also is 3V or 5V compliant, so you can power and communicate with it using any microcontroller or microcomputer.

To make things even easier, Adafruit included SparkFun Qwiic compatible STEMMA QT connectors for the I2C bus so you don't even need to solder! QT Cable is not included, but we have a variety in the shop. 

If you prefer working on a breadboard, each order comes with one fully assembled and tested PCB breakout and a small piece of header. You'll need to solder the header onto the PCB, but it's fairly easy and takes only a few minutes even for a beginner.

Specifications

• Accuracy Specification: ΔRH = ±1.0 %RH, ΔT = ±0.1 °C
• Breakout board Vdd/logic: 3.3V to 5V
• Avg. current: 0.4 µA, Idle current: 80 nA (not including on-board regulator quiescent)
• I2C FM+, CRC checksum, default I2C addr 0x44
• Operating range: 0 … 100 %RH, −40…125 °C
• Fully functional in condensing environment
• Power heater, true NIST-traceability
• JEDEC JESD47 qualification
• Sensor-specific calibration certificate acc. to ISO 17025 : 2017, 3-point temp. calibration
• More information at Sensirion!