AHT20 I2C Temperature & Humidity Sensor – 0.01°C Precision

AHT20 I2C Temperature & Humidity Sensor Module

Meet the next-generation AHT20 I2C Temperature and Humidity Sensor — a compact, high-precision sensing module engineered for makers, engineers, and electronics hobbyists who demand reliable environmental data. With a temperature resolution of 0.01°C and humidity resolution of 0.024% RH, this sensor delivers exceptionally accurate calibrated digital output through a standard I²C interface, making integration with microcontrollers like Arduino, ESP32, and Raspberry Pi straightforward and efficient.

Made in Mainland China.

Why Choose the AHT20 Sensor?

• Ultra-High Precision: Temperature accuracy of ±0.3°C and humidity accuracy of ±2% RH at 25°C for trustworthy readings every time.
• Wide Operating Range: Measures temperatures from -40°C to +85°C and humidity from 0–100% RH — suitable for demanding environments.
• Compact SMD Package: Double-row flat pin-less SMD design (15 × 10.5 mm board, 3×3 mm sensor footprint) fits easily into tight enclosures and PCB layouts.
• Advanced ASIC Chip: Integrates a new-generation ASIC with an improved MEMS capacitive humidity element and an on-chip temperature sensing element for stable, drift-resistant performance.
• I²C Digital Output: Outputs fully calibrated digital signals — no analog conversion needed. Plug in VIN, GND, SCL, and SDA, and you're reading data instantly.
• Low Power Supply: Operates on 2.0–5.5V DC, compatible with 3.3V and 5V systems alike.
• Reflow Solderable: SMD form factor supports reflow soldering for seamless PCB production.

Technical Specifications

Pin Definition

• Pin 1 – VIN: Supply voltage (2.0–5.5V DC)
• Pin 2 – GND: Power ground
• Pin 3 – SCL: Serial clock line (bidirectional)
• Pin 4 – SDA: Serial data line (bidirectional)

Applications

The AHT20 sensor is ideal for a wide range of projects and industries:

• HVAC systems and dehumidifiers
• Weather stations and data loggers
• Consumer electronics and household appliances
• Automotive climate monitoring
• Automated control systems
• Test and detection equipment
• Humidity regulation and environmental monitoring
• Laboratory and industrial applications

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Learn More About Environmental Sensing Standards

For background on measurement accuracy, calibration standards, and sensor performance benchmarks, visit the National Institute of Standards and Technology (NIST) – Environmental Monitoring.

Frequently Asked Questions

Q: What microcontrollers is the AHT20 I2C sensor compatible with?

A: The AHT20 sensor communicates via the standard I²C protocol, making it compatible with virtually any microcontroller that supports I²C — including Arduino (Uno, Mega, Nano), ESP8266, ESP32, Raspberry Pi, STM32, and more. Simply connect VIN, GND, SCL, and SDA to the corresponding pins on your board.

Q: What is the difference between accuracy and resolution on the AHT20?

A: Resolution refers to the smallest detectable change the sensor can report — 0.01°C for temperature and 0.024% RH for humidity. Accuracy refers to how close the reading is to the true value — ±0.3°C for temperature and ±2% RH for humidity at 25°C. The AHT20's high resolution ensures you can detect very small environmental changes, while its accuracy ensures those readings closely reflect real-world conditions.

Q: Can this sensor operate in very humid or very cold environments?

A: Yes. The AHT20 is designed for harsh environments, measuring temperatures from -40°C to +85°C and humidity from 0% to 100% RH. Its improved MEMS capacitive sensing element and advanced ASIC chip provide stable, reliable readings across this entire range, making it suitable for outdoor weather stations, refrigeration monitoring, and industrial deployments.

Q: What is included in the package?

A: Each order includes 1 × AHT20 I2C Temperature and Humidity Sensor Module, ready to connect to your project. No additional hardware is included; you will need jumper wires or a PCB for integration.