AM2301B – Wired Enclosed AHT20 – Temperature and Humidity Sensor

The AM2301B is a nice but inexpensive temperature and humidity sensor from the same folks that brought us the AM2302.

In fact, this enclosed sensor looks an awful lot like the popular DHT22/AM2302 temperature and humidity sensors, but unlike classic DHT sensors, it has an I²C interface! That’s right, you do not need to use a bit-bang timing-specific protocol to talk to the AM2301B, it uses plain-old-I²C. And, you can power it with anything from 2.5V to 5.5V so it’s good with 3V or 5V microcontrollers. Whew, that makes things a little easier, doesn’t it?

Inside is the AHT20. You can take sensor readings as often as you like, and it uses standard I2C so its super easy to use with any Arduino or Linux/Raspberry Pi board.

This sensor has a typical accuracy of ±2% relative humidity, and ±0.3 °C at 20-80% RH and 20-60 °C. There is only one I2C address so it’s not a good option when you need multiple humidity sensors.

That said, for maker and IoT projects? You can’t beat the simplicity and price! And we’ve got ready-to-go working Arduino and CircuitPython code to use it. Check out our detailed guide for library code, datasheet, and more

Each order comes with one AM2301B non-waterproof / wired shell module sensor with built-in pullups. You just provide any microcontroller that can run our Arduino or CircuitPython library.

• I2C address 0x38 (cannot be changed)
• 2.5V to 5.5V power and logic level
• Pin order: Red Power, Black Ground, Yellow SDA, White SCL
• Built in 4.7K I2C pullup resistors.
• Usage Humidity: 0… 100%RH
• Usage Temperature: -40ºC – 80ºC
• Typical accuracy of ±2% relative humidity, and ±0.3 °C at 20-80% RH and 20-60 °C
• Overall accuracy of ±3% relative humidity, and ±0.5 °C
• 24AWG cables
• Product Dimensions: 58.8mm x 26.8mm x 13.2mm / 2.3′ x 1.1′ x 0.5′
• Datasheet