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GY-SHT31-D Digital Temperature and Humidity Sensor Module I2C interface 1.8~3.6V [±2%RH]

SKU: FA3067-1
Sensor IC

Sensirion SHT31
Interface

I2C (up to 1MHz)
Operating Voltage

2.4V – 5.5V (chip: 2.15–5.5V)
Humidity Range / Accuracy

0–100% RH / ±2% RH
Temperature Range / Accuracy

-40°C to +125°C / ±0.2°C to ±0.3°C
Resolution

16-bit (temperature and humidity)
I2C Address

0x44 (default) / 0x45 (configurable)
Pin Count

4 pins (VCC, GND, SCL, SDA) + ADR/RST/ALR

The GY-SHT31-D is a compact, high-precision digital temperature and humidity sensor breakout board built around Sensirion’s SHT31 sensor. It provides calibrated, linearized, and temperature-compensated digital output over a standard I2C interface, making it a reliable choice for environmental monitoring, HVAC control, weather stations, and IoT applications.

At the heart of the module is the SHT31 sensor, which features 16-bit output resolution for both temperature and humidity. The humidity measurement range covers 0–100% RH with a stated accuracy of ±2% RH, while the temperature range spans -40°C to +125°C with ±0.2°C to ±0.3°C accuracy . The sensor is factory-calibrated, with calibration coefficients programmed into on-chip memory, so no external trimming is required .

The module operates from a wide supply voltage range. The Sensirion SHT31 chip itself supports 2.15V to 5.5V , and most GY-SHT31-D breakout boards operate from 2.4V to 5.5V, making them compatible with both 3.3V and 5V microcontrollers . The I2C interface supports communication speeds up to 1MHz , and the module includes onboard pull-up resistors and decoupling capacitors for stable operation.

The default I2C address is 0x44, configurable to 0x45 via the ADR pin, allowing two sensors to share the same bus . The board also exposes RST and ALR (alert) pins for hardware reset and programmable temperature/humidity threshold alarms .

Important Note: While the SHT31 chip supports 2.15–5.5V, verify your specific GY-SHT31-D breakout board’s rated voltage. Some board-level variants include an onboard regulator for 5V compatibility, while others are 3.3V-only. The sensor is not waterproof and should be kept dry. For accurate readings, ensure the module is not exposed to direct sunlight or heat sources.

Whether you are building a weather station, a greenhouse controller, or a smart home sensor node, the GY-SHT31-D provides a reliable, well-supported solution for precise digital environmental sensing.

Features

  • Sensirion SHT31 sensor — High-precision digital temperature and humidity measurement

  • ±2% RH humidity accuracy — Superior accuracy compared to the SHT30 variant

  • ±0.2°C to ±0.3°C temperature accuracy — Precise thermal measurement

  • I2C interface — Up to 1MHz communication speed, compatible with 3.3V and 5V systems

  • Wide measurement range — 0–100% RH and -40°C to +125°C

  • Configurable I2C address — 0x44 (default) or 0x45 via ADR pin

  • Onboard pull-up resistors and capacitors — Ready for direct connection

  • Alert and reset pins — Programmable threshold alarms and hardware reset

  • Compact module form factor — Easy integration into enclosures and projects

  • Wide application range — Weather stations, HVAC, IoT, greenhouse monitoring

Technical Specifications 

# Parameter Specification
1 Sensor IC Sensirion SHT31
2 Interface I2C (up to 1MHz)
3 Operating Voltage 2.4V – 5.5V (chip: 2.15–5.5V)
4 Humidity Range / Accuracy 0–100% RH / ±2% RH
5 Temperature Range / Accuracy -40°C to +125°C / ±0.2°C to ±0.3°C
6 Resolution 16-bit (temperature and humidity)
7 I2C Address 0x44 (default) / 0x45 (configurable)
8 Pin Count 4 pins (VCC, GND, SCL, SDA) + ADR/RST/ALR

Usage

Getting Started (Arduino)

  1. Connect power — Supply 3.3V or 5V to VCC and GND to ground. Verify your specific board’s voltage rating.

  2. Connect I2C lines — Connect SCL to your microcontroller’s I2C clock and SDA to the I2C data line:

    • ESP32: SCL → GPIO22, SDA → GPIO21 (default)

    • Raspberry Pi: SCL → GPIO3, SDA → GPIO2

    • Arduino Uno: SCL → A5, SDA → A4

  3. Install the library — Install the Adafruit_SHT31 library through the Arduino Library Manager. It supports the SHT31 at address 0x44 .

  4. Upload a test sketch — Use the library example to read temperature and humidity over Serial.

  5. Verify readings — Compare against a known reference if precision is critical.

Pin Connections

Module Pin Function
VCC Power (2.4V–5.5V)
GND Ground
SCL I2C Clock
SDA I2C Data
ADR Address Select (optional)
RST Hardware Reset (optional)
ALR Alert Output (optional)

Example Arduino Code (Adafruit_SHT31 Library)

cpp
#include <Wire.h>
#include <Adafruit_SHT31.h>

Adafruit_SHT31 sht31 = Adafruit_SHT31();

void setup() {
  Serial.begin(9600);
  if (!sht31.begin(0x44)) {
    Serial.println("Couldn't find SHT31");
    while (1) delay(1);
  }
}

void loop() {
  float temp = sht31.readTemperature();
  float hum = sht31.readHumidity();

  if (!isnan(temp)) {
    Serial.print("Temp: "); Serial.print(temp); Serial.println(" °C");
  }
  if (!isnan(hum)) {
    Serial.print("Humidity: "); Serial.print(hum); Serial.println(" %");
  }
  delay(1000);
}

Typical Applications

  • Weather stations — Ambient temperature and humidity logging

  • HVAC systems — Indoor climate control and monitoring

  • Greenhouse automation — Environmental condition tracking

  • IoT sensor nodes — Connected environmental monitoring

  • Smart home devices — Climate-aware automation

Notes for Business Buyers

  • ±2% RH accuracy — Higher precision than the SHT30 variant, suitable for demanding applications.

  • Wide voltage compatibility — Check your specific breakout board’s rated voltage (some are 5V-compatible via onboard regulation, others are 3.3V-only).

  • Two address options — Allows two sensors on the same I2C bus for multi-zone monitoring.

  • Suitable for bulk purchasing — Ideal for weather station manufacturers, HVAC integrators, and IoT product developers.

Q: What is the GY-SHT31-D module used for?

It is a high-precision digital temperature and humidity sensor for environmental monitoring in weather stations, HVAC systems, greenhouses, and IoT devices.

Q: What is the operating voltage?

The SHT31 chip supports 2.15V to 5.5V . Most GY-SHT31-D breakout boards operate from 2.4V to 5.5V . Verify your specific board’s rating.

Q: What is the humidity accuracy?

The humidity accuracy is ±2% RH , higher than the SHT30’s ±3% RH.

Q: What is the temperature accuracy?

The temperature accuracy is ±0.2°C to ±0.3°C depending on the measurement range .

Q: What is the default I2C address?

The default I2C address is 0x44. It can be changed to 0x45 by connecting the ADR pin to VCC .

Q: Can I use two SHT31 modules on the same I2C bus?

Yes. Set one module to 0x44 and the other to 0x45 using the ADR pin.

Q: What library should I use with Arduino?

Use the Adafruit_SHT31 library, available through the Arduino Library Manager .

Q: Is the sensor waterproof?

No. The GY-SHT31-D module is not waterproof and should be kept dry.

Q: Why does my sensor not respond?

Check that the supply voltage is within range, the I2C wiring is correct, and the correct address (0x44) is being used. Also ensure the SDA/SCL lines are not swapped.

Q: Can I purchase in bulk for a product development project?

Yes. This module is suitable for bulk purchasing by weather station manufacturers, HVAC integrators, and IoT product developers.

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