Adafruit HTU31 Temperature & Humidity Sensor Breakout - STEMMA QT / Qwiic
HTU31-D I2C temperature and humidity sensor breakout with STEMMA QT/Qwiic connectors and 3.3–5V microcontroller support.
Pinout
- VIN3V-5V
board supply input; Adafruit product page states safe with 3.3V-5V microcontroller power/logic
Type · PowerVoltage · 3.3V-5V - GND
common ground for power and I2C
Type · Ground - SDA
I2C data via STEMMA QT/Qwiic connector or header pads
Type · I2C - SCL
I2C clock via STEMMA QT/Qwiic connector or header pads
Type · I2C - RST
hardware reset pin, product page notes a hardware reset pin
Type · Control - ADDR
address-select pin, product page notes address-select support for two sensors on one I2C bus
Type · Control
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VIN3V-5V | Power | board supply input; Adafruit product page states safe with 3.3V-5V microcontroller power/logic | 3.3V-5V |
| GND | Ground | common ground for power and I2C | |
| SDA | I2C | I2C data via STEMMA QT/Qwiic connector or header pads | |
| SCL | I2C | I2C clock via STEMMA QT/Qwiic connector or header pads | |
| RST | Control | hardware reset pin, product page notes a hardware reset pin | |
| ADDR | Control | address-select pin, product page notes address-select support for two sensors on one I2C bus |
Pin details
6 connections- VIN3V-5V
board supply input; Adafruit product page states safe with 3.3V-5V microcontroller power/logic
PowerVoltage · 3.3V-5V - GND
common ground for power and I2C
Ground - SDA
I2C data via STEMMA QT/Qwiic connector or header pads
I2C - SCL
I2C clock via STEMMA QT/Qwiic connector or header pads
I2C - RST
hardware reset pin, product page notes a hardware reset pin
Control - ADDR
address-select pin, product page notes address-select support for two sensors on one I2C bus
Control
Start wiring
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: VIN / 3V-5V, GND, SDA, SCL. Schematik maps them to your board in the app.
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