I2C temperature and humidity sensor breakout (SHT31-D) with ±2% RH and ±0.3°C accuracy, PTFE-filtered housing, and 3.3 V/5 V compatibility. Good choice when DHT-series accuracy is insufficient.
Board power input. Adafruit Learn states the chip can use 2.5-5VDC and the board should be powered at the same level as the microcontroller logic.
Common ground for power and logic.
I2C clock line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin.
I2C data line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin.
STEMMA QT I2C connector for development boards and accessories, carrying the board I2C/power connection.
I2C address selection. Adafruit Learn states the default address is 0x44 via 10K pull-down, and tying ADR to Vin selects 0x45.
Hardware reset input. Adafruit Learn states it has a 10K pull-up and can be connected to ground for reset.
Alert/interrupt output for configured sensor events.
| Pin | Type | Function | Voltage |
|---|---|---|---|
| Vin | Power | Board power input. Adafruit Learn states the chip can use 2.5-5VDC and the board should be powered at the same level as the microcontroller logic. | 2.5-5VDC, match controller logic level |
| GND | Ground | Common ground for power and logic. | 0V |
| SCL | I2C | I2C clock line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin. | logic level pulled up to Vin |
| SDA | I2C | I2C data line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin. | logic level pulled up to Vin |
| STEMMA QT | Unknown | STEMMA QT I2C connector for development boards and accessories, carrying the board I2C/power connection. | |
| ADR | Unknown | I2C address selection. Adafruit Learn states the default address is 0x44 via 10K pull-down, and tying ADR to Vin selects 0x45. | low default, tie to Vin for address 0x45 |
| RST | Control | Hardware reset input. Adafruit Learn states it has a 10K pull-up and can be connected to ground for reset. | pulled up by default, active low reset |
| ALR | Signal | Alert/interrupt output for configured sensor events. |
Board power input. Adafruit Learn states the chip can use 2.5-5VDC and the board should be powered at the same level as the microcontroller logic.
Common ground for power and logic.
I2C clock line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin.
I2C data line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin.
STEMMA QT I2C connector for development boards and accessories, carrying the board I2C/power connection.
I2C address selection. Adafruit Learn states the default address is 0x44 via 10K pull-down, and tying ADR to Vin selects 0x45.
Hardware reset input. Adafruit Learn states it has a 10K pull-up and can be connected to ground for reset.
Alert/interrupt output for configured sensor events.
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: Vin, GND, SCL, SDA. Schematik maps them to your board in the app.
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