AM2301B - WIRED ENCLOSED AHT20 - TEMPERATURE AND HUMIDITY SENSOR, ADAFRUIT 5181

AM2301B Temperature and Humidity Sensor (I²C)

The AM2301B is an affordable and reliable sensor for measuring temperature and relative humidity. Its versatility makes it an excellent choice for a variety of maker projects and IoT applications. Visually, it closely resembles the popular DHT22/AM2302 sensors but offers a significant upgrade – it uses the standard I²C interface, which simplifies integration with microcontrollers.

Inside the enclosure is the advanced AHT20 sensor, which enables fast and frequent data acquisition. The sensor operates with a wide supply voltage range from 2.5V to 5.5V, making it compatible with both 3V and 5V logic devices such as Arduino and Raspberry Pi.

The AM2301B provides typical accuracy of ±2% relative humidity and ±0.3 °C in the range of 20–80% RH and 20–60 °C. It includes built-in 4.7kΩ pull-up resistors on the I²C lines and uses a fixed I²C address (0x38), which means it’s not suitable for applications that require multiple identical sensors on the same I²C bus.

Despite that, its ease of use, solid accuracy, and low price make it a great solution for many hobby and professional projects. It is supported by open-source Arduino and CircuitPython libraries, with documentation and examples available.

Technical Specifications:

• Communication: I²C (fixed address 0x38)
• Supply voltage: 2.5V to 5.5V
• Logic level compatibility: 3V and 5V
• Wiring: Red – VCC, Black – GND, Yellow – SDA, White – SCL
• Built-in pull-up resistors: 4.7kΩ
• Humidity range: 0 – 100% RH
• Temperature range: -40 °C to +80 °C
• Typical accuracy: ±2% RH, ±0.3 °C
• Overall accuracy: ±3% RH, ±0.5 °C
• Cable gauge: 24AWG
• Product dimensions: 58.8 mm × 26.8 mm × 13.2 mm

Each unit comes with one AM2301B sensor module in a plastic enclosure with pre-attached wires (non-waterproof).

Datasheet