SparkFun Humidity Sensor Breakout - SHTC3 (Qwiic)

The SparkFun SHTC3 Humidity Sensor is a cost-effective, easy-to-use, highly precise digital humidity and temperature sensor. It's perfect for those who wish to monitor the climate in their greenhouse, set up a humidor control system, or gather temperature and humidity data for a weather station project. The sensor communicates via I²C and its pins have been broken out to Qwiic connectors for effortless integration with SparkFun's growing Qwiic Ecosystem.

The SHTC3 digital humidity sensor, a product of Sensirion, is an improvement on their SHTC1 sensor. It offers a wider supply voltage range (1.62V to 3.6V) and higher accuracy (±2% RH, ±0.2°C), providing more flexibility. With just two lines for I²C communication, you can get relative humidity readings and highly accurate temperature readings.

Connecting the sensor is a breeze thanks to the Qwiic connect system on the breakout board. The board has built-in 2.2kΩ pullup resistors for I²C communications. If you are connecting multiple I²C devices on the same bus, you may need to disable these resistors.

It's important to note that the I²C address of the SHTC3 is 0x70 and is hardware defined. A multiplexer/Mux is required to communicate with multiple SHTC3 sensors on a single bus.

The SparkFun Qwiic Connect System is an ecosystem of I²C sensors, actuators, shields, and cables that simplifies prototyping and reduces the risk of errors. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector, which saves PCB space and ensures correct connections due to its polarized design.

The SHTC3 digital humidity sensor can also be automatically detected, scanned, configured, and logged using the OpenLog Artemis datalogger system, eliminating the need for programming, soldering, or setup.

Features:

• Uses I²C interface (Qwiic-enabled)
  • I²C Address: 0x70
  • 2x Qwiic Connectors
• Operating voltage range
  • 1.62V - 3.6 V
  • Typically 3.3V if using the Qwiic cable
• Relative Humidity
  • Operating range: 0% to 100%
  • Typical accuracy: ±2 %RH
  • Resolution: 0.01 %RH
• Temperature
  • Operating range: -40°C to +125 °C
  • Typical accuracy: ±0.2 °C
  • Resolution: 0.01 °C
• Typical current consumption (varies based on mode)
  • 4.9µA to 430µA (Normal Mode)
  • 0.5µA to 270µA (Low Power Mode)

Documents:

• Schematic
• Eagle Files
• Hookup Guide
• Board Dimensions
• Datasheet (SHTC3)
• Qwiic Connect System
• Arduino Library
• GitHub Hardware Repo