Fermion: AHT20 Temperature and Humidity Sensor

The AHT20 is a high-precision but low-cost temperature and humidity sensor, which is equipped with an improved MEMS semiconductor capacitive humidity sensor element. It features a standard I2C interface and a wide voltage supply of 2V-5V. With the simple peripheral circuit, it performs stably even in harsh environments in the measuring range of -40℃ ~ ＋85℃.

This sensor can be widely used for measuring the environmental temperature and humidity of home electronic equipment, the temperature and humidity of automobiles and more.

Connection Example – Arduino

Features

• Digital output, I2C interface
• Excellent long-term stability
• Quick response and strong anti-interference ability

Specifications

Module Parameters

• Operating Voltage: DC2V-5V
• Output Signal: I2C
• I2C Address: 0x38
• Dimension: 30mm×20.5mm/1.18×0.81′

AHT20 Chip Parameters

Relative Humidity

• Resolution: 0.024 %RH
• Accuracy Error: ±2 %RH
• Repeatability: ±0.1 %RH
• Hysteresis: ±1 %RH
• Non-linear: ±0.1 %RH
• Response Time: 8S
• Operating Range: 0~100 %RH
• Long-term Drift: ＜0.5 %RH/yr

Temperature

• Resolution: 0.01℃
• Accuracy Error: ±0.3℃
• Repeatability: ±0.1℃
• Hysteresis: ±0.1℃
• Response Time: minimum 5S, maximum 30S
• Operating Range: -40℃~85℃
• Long-term Drift: ＜0.04℃/yr

Package Contents

• 1x Fermion: AHT20 Temperature and Humidity Sensor
• 1x 2.54mm 4-Pin Black Single-row Pin Header

Resources

• Product wiki
• DFRobot AHT20 Library
• Dimensions
• Circuit Diagram SCH
• 2D Dimensions
• 2D CAD_Dimensions
• 3D STP

Pinout

Pin	Function	Description
VCC	Positive Power Supply	Power Supply: DC 2V~5V
GND	Negative Power Supply	—
SCL	I2C Clock Line	—
SDA	I2C Data Line	—