AHT21 I2C Digital Temperature & Humidity Sensor Module

The AHT21 I2C Digital Temperature & Humidity Sensor Module is a high-precision sensing solution designed for makers, hobbyists, and engineers who need accurate environmental data in their projects. With its wide measuring range and low-voltage operation, this compact module integrates seamlessly with Arduino, Raspberry Pi, and other microcontroller platforms via the standard I2C interface.

Key Features

• High-Precision Sensing: Measures temperature from -40°C to +80°C and relative humidity from 0% to 100% RH with excellent accuracy.
• I2C Interface: Simple two-wire communication makes wiring and integration fast and straightforward — perfect for both beginners and experienced developers.
• Wide Voltage Compatibility: Operates on supply voltages from 2.2V to 5.5V, compatible with 3.3V and 5V systems alike.
• Compact Metal Construction: Durable metal build ensures reliable, long-term performance in a variety of environments.
• SHT20 Alternative: A cost-effective drop-in replacement for SHT20-based designs, offering comparable performance at a more accessible price point.
• Customizable: Available with customization options to suit specific project requirements.

Specifications

Who Is This For?

Whether you're building a weather station, a smart home automation system, a greenhouse monitor, or an IoT prototype, the AHT21 sensor module delivers the environmental data you need. Its I2C interface keeps your project wiring tidy, and its broad voltage support means it fits into virtually any microcontroller setup.

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Frequently Asked Questions

Q: What makes the AHT21 I2C Sensor Module high-precision?

A: The AHT21 uses a resistance-based sensing mechanism combined with a digital I2C output to deliver stable and accurate temperature and humidity readings. Its measuring range of -40°C to +80°C for temperature and 0–100% RH for humidity makes it suitable for a wide range of real-world monitoring applications.

Q: Is the AHT21 module compatible with Arduino?

A: Yes! The AHT21 sensor module communicates via the standard I2C protocol, making it fully compatible with Arduino, Raspberry Pi, ESP8266, ESP32, and most other popular microcontroller and single-board computer platforms. Simply connect VCC, GND, SDA, and SCL, and you're ready to go.

Q: Can this module replace an SHT20 sensor in my existing project?

A: The AHT21 is widely used as a cost-effective alternative to SHT20-based designs. It offers comparable performance and uses the same I2C interface, making it straightforward to integrate into existing schematics with minimal adjustments.

Q: What voltage does the AHT21 sensor module require?

A: The AHT21 module supports a supply voltage range of 2.2V to 5.5V, making it compatible with both 3.3V and 5V systems. This flexibility ensures broad compatibility across virtually all common microcontroller platforms.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.