Fermion: AHT20 Temperature and Humidity Sensor (Breakout)
AHT20 MEMS temperature and humidity sensor on a Fermion breakout; I2C (address 0x38), 2–5 V supply, ±0.3 °C / ±2 %RH accuracy, 0.01 °C / 0.024 %RH resolution. Improved stability over AHT10; low drift over time.
Pinout
- VIN1?
module supply input
Type · PowerVoltage · 3.3-5V - GND2?
ground
Type · Ground - SDA3?
I2C data
Type · I2C - SCL4?
I2C clock
Type · I2C
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | 1? | Power | module supply input | 3.3-5V |
| GND | 2? | Ground | ground | |
| SDA | 3? | I2C | I2C data | |
| SCL | 4? | I2C | I2C clock |
Pin details
4 connections- VIN1?
module supply input
PowerVoltage · 3.3-5V - GND2?
ground
Ground - SDA3?
I2C data
I2C - SCL4?
I2C clock
I2C
Start wiring
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: VIN, GND, SDA, SCL. Schematik maps them to your board in the app.
Temp & humidity
165 other optionsDHT/AHT sensors, SHT-series humidity chips, BMP and LPS barometers, BME combined sensors, DS18B20 probes, thermocouple amplifiers and non-contact MLX IR sensors — about 165 listings, very different accuracy classes.
Adafruit AHT20 Temperature & Humidity Sensor Breakout Board visual previewAdafruit AHT20 Temperature & Humidity Sensor Breakout Board
$4.50
Adafruit BME280 I2C or SPI Temperature Humidity Pressure Sensor visual previewAdafruit BME280 I2C or SPI Temperature Humidity Pressure Sensor
$14.95
Adafruit BMP580 I2C or SPI Temperature and Pressure Sensor visual previewAdafruit BMP580 I2C or SPI Temperature and Pressure Sensor
$7.95
Adafruit BMP581 I2C / SPI Temperature and Pressure Sensor visual previewAdafruit BMP581 I2C / SPI Temperature and Pressure Sensor
$9.95
Adafruit BMP585 Ported I2C / SPI Temperature and Pressure Sensor visual previewAdafruit BMP585 Ported I2C / SPI Temperature and Pressure Sensor
$14.95
Adafruit Chainable DS18B20 Extender Breakout visual previewAdafruit Chainable DS18B20 Extender Breakout
$4.50
Adafruit HDC3022 Precision Temperature & Humidity Sensor visual previewAdafruit HDC3022 Precision Temperature & Humidity Sensor
$8.95
Adafruit HTS221 Temperature & Humidity Sensor Breakout - STEMMA QT / Qwiic visual previewAdafruit HTS221 Temperature & Humidity Sensor Breakout - STEMMA QT / Qwiic
$9.95
Adafruit HTU21D-F Temperature & Humidity Sensor Breakout - STEMMA QT visual previewAdafruit HTU21D-F Temperature & Humidity Sensor Breakout - STEMMA QT
$10.95
Adafruit HTU31 Temperature & Humidity Sensor Breakout - STEMMA QT / Qwiic visual previewAdafruit HTU31 Temperature & Humidity Sensor Breakout - STEMMA QT / Qwiic
$6.95
Adafruit LPS25 Pressure Sensor - STEMMA QT / Qwiic visual previewAdafruit LPS25 Pressure Sensor - STEMMA QT / Qwiic
$9.95
Adafruit LPS35HW Water Resistant Pressure Sensor visual previewAdafruit LPS35HW Water Resistant Pressure Sensor
Related groups
4 groups
BOSON: Heart Rate Monitor Sensor i20 visual previewBiometrics
UART/I2C fingerprint modules, MAX30102 PPG breakouts, and analog ECG/EMG front-ends for access control and hobby biometric sensing.
Sensors · Biometric sensors · 26 parts
0.3M Pixel Serial JPEG Camera Module visual previewCameras
Pi CSI modules, USB cameras, MCU-class OV2640/OV5640 boards, on-camera AI like HuskyLens and OpenMV, and thermal or ToF imagers — over 130 listings across very different pipelines.
Sensors · Cameras & vision · 141 parts
0.28 Inch LED Digital DC Voltmeter - Green visual previewPower monitors
INA-series I2C monitors, Hall-effect sensors like the ACS723 and Gravity 20A/50A boards, and non-invasive CT clamps for everything from 3.3V rail telemetry to mains current sensing.
Sensors · Current & voltage · 25 parts
25m Long Distance ToF Laser Sensor (±3cm Accuracy, 100Hz, 100K LUX Resistant) visual previewDistance sensors
About 180 listings spanning VL53-series ToF breakouts, HC-SR04 and MaxSonar ultrasonics, 360° triangulation LiDARs, IR proximity sensors, 24GHz mmWave presence detection and laser break-beam sensors.
Sensors · Distance sensors · 177 parts