Adafruit Sensirion SHT31-D Temperature & Humidity Breakout

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.

Logical pinout · physical placement not verified

Vin
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.
Type · PowerVoltage · 2.5-5VDC, match controller logic level
GND
Common ground for power and logic.
Type · GroundVoltage · 0V
SCL
I2C clock line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin.
Type · I2CVoltage · logic level pulled up to Vin
SDA
I2C data line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin.
Type · I2CVoltage · logic level pulled up to Vin
STEMMA QT
STEMMA QT I2C connector for development boards and accessories, carrying the board I2C/power connection.
Type · Unknown
ADR
I2C address selection. Adafruit Learn states the default address is 0x44 via 10K pull-down, and tying ADR to Vin selects 0x45.
Type · UnknownVoltage · low default, tie to Vin for address 0x45
RST
Hardware reset input. Adafruit Learn states it has a 10K pull-up and can be connected to ground for reset.
Type · ControlVoltage · pulled up by default, active low reset
ALR
Alert/interrupt output for configured sensor events.
Type · Signal

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.

Logical pinout · physical placement not verified

Pin details

8 connections

Vin
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.
PowerVoltage · 2.5-5VDC, match controller logic level
GND
Common ground for power and logic.
GroundVoltage · 0V
SCL
I2C clock line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin.
I2CVoltage · logic level pulled up to Vin
SDA
I2C data line. Adafruit Learn states this pin has a 10K pull-up resistor to Vin.
I2CVoltage · logic level pulled up to Vin
STEMMA QT
STEMMA QT I2C connector for development boards and accessories, carrying the board I2C/power connection.
Unknown
ADR
I2C address selection. Adafruit Learn states the default address is 0x44 via 10K pull-down, and tying ADR to Vin selects 0x45.
UnknownVoltage · low default, tie to Vin for address 0x45
RST
Hardware reset input. Adafruit Learn states it has a 10K pull-up and can be connected to ground for reset.
ControlVoltage · pulled up by default, active low reset
ALR
Alert/interrupt output for configured sensor events.
Signal

Start wiring

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.

Temp & humidity

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Pinout