AHT20 I2C Temperature & Humidity Sensor – 0.01°C Resolution

AHT20 I2C Temperature & Humidity Sensor Module

Meet the next-generation AHT20 I2C Temperature and Humidity Sensor — a compact, high-precision digital sensor module designed for makers, engineers, and electronics enthusiasts who demand reliable environmental data. With a temperature resolution of 0.01°C and humidity resolution of 0.024% RH, this sensor delivers calibrated digital output via a standard I²C interface, making it effortless to integrate into Arduino, Raspberry Pi, ESP32, and other microcontroller projects.

Built around an advanced ASIC chip combined with a MEMS capacitive humidity sensing element and an on-chip temperature sensing element, the AHT20 outperforms previous-generation sensors in both stability and accuracy — even in demanding or harsh environments.

Key Features

• ✅ High Precision: Temperature accuracy ±0.3°C | Humidity accuracy ±2% RH @ 25°C
• ✅ Ultra-Fine Resolution: 0.01°C temperature | 0.024% RH humidity
• ✅ Wide Measurement Range: –40°C to +85°C | 0–100% RH
• ✅ I²C Digital Output: Clean, calibrated signal — no analog conversion needed
• ✅ Broad Supply Voltage: 2.0V–5.5V DC — compatible with 3.3V and 5V systems
• ✅ Compact Form Factor: 15 × 10.5 mm board — fits tight project enclosures
• ✅ SMD Package: 3×3 mm flat pin-less profile suitable for reflow soldering
• ✅ Materials: Metal & Plastic construction

Product Specifications

Pin Definitions

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

Ideal Applications

The AHT20 sensor is purpose-built for a wide range of electronics and automation projects:

• HVAC systems & smart climate control
• Weather stations & environmental monitoring
• Dehumidifiers & humidistats
• Data loggers & test equipment
• Home automation (Arduino, ESP32, Raspberry Pi)
• Consumer electronics & appliances
• Automotive climate sensing
• Cleanrooms & laboratory monitoring

Related Products You May Like

• 1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino
• 0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits
• 0–300mm PCB Holder Stand | 360° Rotation Soldering Clamp

Learn More About Environmental Sensing Standards

For technical guidance on calibration and accuracy standards for measurement instruments, visit the National Institute of Standards and Technology (NIST) – Calibrations.

Made in Mainland China.

Note: Slight color variations may occur due to monitor brightness settings. Please allow minor measurement deviations for dimensional data.

Frequently Asked Questions

Q: Is the AHT20 sensor compatible with Arduino and Raspberry Pi?

A: Yes! The AHT20 uses a standard I²C interface and operates at 2.0–5.5V DC, making it fully compatible with Arduino, Raspberry Pi, ESP32, ESP8266, and virtually any microcontroller with I²C support. Many popular Arduino and Python libraries already support the AHT20 natively.

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

A: Resolution refers to the smallest change the sensor can detect — 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. This sensor offers excellent resolution for fine-grained readings and solid accuracy for reliable real-world measurements.

Q: Can this sensor be used outdoors or in harsh environments?

A: The AHT20 is engineered for improved stability in challenging conditions and covers a wide range of –40°C to +85°C and 0–100% RH. For prolonged outdoor deployment, it is recommended to house the module in a protective enclosure to shield it from direct moisture, condensation, and contaminants.

Q: What are the 4 pins on the AHT20 module?

A: The module has four pins: VIN (supply voltage 2.0–5.5V), GND (ground), SCL (I²C serial clock), and SDA (I²C serial data). Connect VIN and GND to your power supply, and SCL/SDA to the corresponding I²C pins on your microcontroller.