Fermion: AHT20 Temperature and Humidity Sensor

DFRobotSKU: SEN0527
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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


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


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


  • 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



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

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