GY-SHT31-D Digital Temperature and Humidity Sensor Module

Description

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 for demanding environmental monitoring

• ±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