DFRobot
Fermion: AHT20 Temperature and Humidity Sensor (Breakout)
The Fermion AHT20 is a high-precision, low-cost temperature and humidity sensor breakout from DFRobot. Built around an improved MEMS semiconductor capacitive...
The Fermion AHT20 is a high-precision, low-cost temperature and humidity sensor breakout from DFRobot. Built around an improved MEMS semiconductor capacitive humidity sensor element, it communicates over a standard I2C interface and operates across a wide 2–5 V supply range.
The sensor performs reliably across a wide temperature range of −40 °C to +85 °C, making it suitable for environmental monitoring, HVAC systems, weather stations, and data logging applications.
Key Features
- I2C Digital Output – Simple two-wire interface at address 0x38
- Wide Voltage Range – 2 V to 5 V DC supply
- High Precision – ±0.3 °C temperature accuracy, ±2% RH humidity accuracy
- Excellent Long-Term Stability – Low drift over time
- Quick Response – Strong anti-interference performance
- Compact Breakout – 30 mm × 20.5 mm board with standard 2.54 mm header
Specifications
- Operating Voltage: 2–5 V DC
- Interface: I2C (address 0x38)
- Board Dimensions: 30 mm × 20.5 mm (1.18″ × 0.81″)
Humidity (AHT20)
- Resolution: 0.024% RH
- Accuracy: ±2% RH
- Repeatability: ±0.1% RH
- Hysteresis: ±1% RH
- Response Time: 8 s
- Operating Range: 0–100% RH
- Long-Term Drift: <0.5% RH/year
Temperature (AHT20)
- Resolution: 0.01 °C
- Accuracy: ±0.3 °C
- Repeatability: ±0.1 °C
- Hysteresis: ±0.1 °C
- Response Time: 5–30 s
- Operating Range: −40 °C to +85 °C
- Long-Term Drift: <0.04 °C/year
Ideal For
- HVAC and climate control systems
- Weather stations and data loggers
- Dehumidifier and appliance monitoring
- Automotive environmental sensing
Package Contents
- 1× Fermion AHT20 Temperature and Humidity Sensor breakout
- 1× 2.54 mm 4-pin header
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
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Brands
Supplier page — dfrobot.com
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