GY-21 HTU21 SHT21 Digital Humidity And Temperature Sensor Module

GY-21 HTU21 SHT21 Digital Humidity And Temperature Sensor Module – digital temperature and humidity sensor

The GY-21 HTU21 module is a compact and precise digital temperature and humidity sensor designed for environmental monitoring, data logging, and IoT applications. Because it functions as both a temp and humidity sensor and a fully digital interface unit, it is widely used in weather stations, smart homes, and embedded projects. Its accuracy and simplicity make it a reliable choice when selecting the best temperature sensor for small-scale or professional systems. This module operates on the I2C interface, allowing fast and stable communication with microcontrollers. With only four connection pins, including built-in 4.7k pull-ups, users can integrate the GY-21 quickly into their circuits. The HTU21/SHT21 IC delivers high accuracy for humidity and temperature, making it a dependable digital temperature and humidity sensor for continuous environmental measurement. Whether for humidity control systems or air-quality devices, it ensures consistent readings and long-term stability.

Furthermore, its efficient design supports Arduino and other development boards, enabling beginners and professionals to deploy this temp and humidity sensor with minimal setup. Because of its clean I2C communication protocol, the GY-21 often performs in low-power and portable sensing applications.

Technical Details

Features

Applications :

• Weather monitoring systems requiring a stable digital temperature and humidity sensor
• Industrial humidity and temperature control using a dependable temp and humidity sensor
• HVAC (Heating, Ventilation, and Air Conditioning) systems for automation
• Smart home and IoT environmental monitoring
• Agricultural climate control systems 
• Medical and pharmaceutical storage
• Wearables and consumer electronics
• IoT-based sensor networks and embedded systems

Integration with Arduino

Sample Code

Physical Attributes

Package Includes