DHT21 AM2301 Digital Humidity & Temperature Sensor Module

DHT21 AM2301 Digital Humidity & Temperature Sensor Module

The DHT21 AM2301 Digital-Output Humidity & Temperature Sensor Module delivers accurate, reliable environmental readings in a compact, easy-to-integrate package. Using a single-bus digital signal output, this sensor is a go-to choice for makers, engineers, and hobbyists who need precise humidity and temperature data without complex wiring.

Available in two variants — AM2301A and AM2301B — this module is built from durable polymer materials and is compatible with a wide range of microcontrollers and development boards including Arduino, Raspberry Pi, and ESP8266/ESP32 platforms.

Key Features

• Digital Single-Bus Output: Simple single-wire serial interface for fast, clean data transmission
• Dual Measurement: Simultaneously measures relative humidity and ambient temperature
• Wide Application Range: Compatible with HVAC systems, weather stations, data loggers, consumer electronics, appliances, humidity regulators, and automotive data logging
• Polymer Construction: Lightweight yet durable housing for long-term reliable performance
• Two Variants Available: AM2301A and AM2301B to suit different project requirements
• Low Power Consumption: Ideal for battery-powered and embedded applications

Specifications

Who Is This For?

Whether you're building a DIY weather station, integrating climate monitoring into a smart home setup, or developing industrial HVAC solutions, the DHT21 AM2301 sensor module provides the accuracy and simplicity you need. Its single-bus communication protocol keeps your circuit clean and your code straightforward.

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Frequently Asked Questions

Q: What is the DHT21 AM2301 sensor module used for?

A: The DHT21 AM2301 digital humidity and temperature sensor module is used in a wide range of applications including HVAC systems, DIY weather stations, automotive data loggers, smart home appliances, humidity regulators, and test & inspection equipment. Its digital single-bus output makes it easy to interface with microcontrollers like Arduino and Raspberry Pi.

Q: What is the difference between the AM2301A and AM2301B variants?

A: The AM2301A and AM2301B are two variants of the DHT21 sensor. Both provide digital humidity and temperature output via a single-bus line. The primary differences lie in their calibration parameters and tolerance ranges, making each suited to slightly different precision requirements. Check your project specifications to choose the right variant.

Q: How does the single-bus digital output work on the DHT21 sensor?

A: The DHT21 AM2301 uses a proprietary single-wire serial communication protocol. The microcontroller sends a start signal, and the sensor responds with a 40-bit data packet containing both humidity and temperature readings. This design minimizes the number of GPIO pins required and simplifies wiring in your circuit.

Q: Is the DHT21 AM2301 compatible with Arduino and Raspberry Pi?

A: Yes, the DHT21 AM2301 sensor module is widely compatible with popular development platforms including Arduino, Raspberry Pi, ESP8266, and ESP32. Many open-source libraries (such as the Adafruit DHT sensor library) support this module out of the box, making integration quick and straightforward.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.