GY-SHT40 Digital Temperature and Humidity Sensor – High Precision

GY-SHT40 Digital Temperature and Humidity Sensor – High Accuracy I2C Environmental Sensor

Product Description

The GY-SHT40 Digital Temperature and Humidity Sensor is a compact and high-accuracy environmental sensing module designed for monitoring temperature and relative humidity in electronic, industrial, IoT, and automation applications.

Based on the SHT40 sensor, the module provides accurate digital measurement of temperature and humidity, with humidity accuracy of ±1.8% RH and temperature accuracy of ±0.2°C. Its reliable sensing performance makes it suitable for applications where stable and precise environmental measurements are required.

The sensor supports a wide temperature measurement range of -40°C to 125°C and a relative humidity range of 0% to 100% RH. Its low-power operation and wide supply voltage range of 1.08V to 3.6V DC make it suitable for battery-powered IoT devices, portable electronics, and embedded monitoring systems.

The module communicates through a standard I2C digital interface, allowing easy connection with Arduino, ESP32, Raspberry Pi, STM32, and other compatible microcontrollers.

Features

• High-accuracy digital temperature and humidity sensor
• Based on SHT40 sensor technology
• Temperature accuracy up to ±0.2°C
• Humidity accuracy up to ±1.8% RH
• Temperature measurement range from -40°C to 125°C
• Humidity measurement range from 0% to 100% RH
• Digital I2C communication interface
• Wide operating voltage range of 1.08V to 3.6V DC
• Low-power operation
• Compact module design
• Suitable for battery-powered applications
• Easy integration with microcontrollers
• Ideal for IoT and environmental monitoring
• Suitable for industrial and consumer applications

Specifications

Parameter	Specification
Product Type	Digital Temperature and Humidity Sensor
Model	SHT40
Humidity Range	0% – 100% RH
Temperature Range	-40°C – 125°C
Humidity Accuracy	±1.8% RH
Temperature Accuracy	±0.2°C
Operating Voltage	1.08V – 3.6V DC
Output Interface	I2C
Dimensions	12 × 10 × 3 mm
Sensor Type	Digital Temperature and Humidity Sensor

Working Principle

The SHT40 detects environmental temperature and relative humidity using an integrated digital sensing element.

The sensor internally processes the measured environmental conditions and provides digital data through the I2C communication interface. A connected microcontroller can request temperature and humidity readings and use the data for monitoring, control, logging, or automation applications.

Because the sensor provides digital output, it can be directly integrated into suitable embedded systems without requiring an external analog signal-conditioning circuit.

Digital I2C Interface

The GY-SHT40 communicates using the I2C protocol, allowing it to share a digital communication bus with other compatible sensors and peripherals.

This makes it convenient to connect with:

• Arduino
• ESP32
• ESP8266
• Raspberry Pi
• STM32
• Other I2C-compatible microcontrollers

Low-Power Operation

The sensor is designed for low-power applications and operates from 1.08V to 3.6V DC. This makes it suitable for battery-powered IoT systems, portable devices, environmental data loggers, and remote monitoring equipment.

Its low-power characteristics help support applications where energy efficiency and long operating time are important.

Typical Application Scenarios

HVAC Systems

Suitable for monitoring temperature and humidity in heating, ventilation, and air-conditioning systems for smart environmental control.

Weather Stations

Can be used for collecting digital environmental data in indoor and outdoor weather monitoring systems.

Greenhouses

Useful for monitoring environmental conditions in agricultural and greenhouse applications where temperature and humidity affect plant growth.

Smart Home Devices

Suitable for smart home systems, air-quality monitors, climate controllers, and connected environmental sensing devices.

IoT Monitoring

Can be integrated into wireless sensor nodes and remote monitoring systems for continuous temperature and humidity measurement.

Applications

• HVAC systems
• Weather stations
• Greenhouse monitoring
• Smart home systems
• IoT environmental sensors
• Climate monitoring
• Air-quality monitoring systems
• Temperature logging
• Humidity monitoring
• Industrial automation
• Data acquisition systems
• Battery-powered sensors
• Portable electronics
• Arduino projects
• ESP32 projects
• Raspberry Pi projects
• STM32 projects
• Educational electronics
• Environmental monitoring

Package Includes

• 1 × GY-SHT40 Digital Temperature and Humidity Sensor

Product Disclaimer

Product images are shown for illustrative and representational purposes only. The actual module may vary slightly in PCB colour, component placement, connector arrangement, dimensions, or appearance depending on the manufacturing batch.

Arduino boards, ESP32 boards, Raspberry Pi boards, wires, cables, breadboards, and other accessories shown in product images are not included unless specifically mentioned in the package contents.

Sensor accuracy and performance may vary depending on operating conditions, environmental factors, installation, airflow, condensation, and measurement setup.

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