DHT21 AM2301 Digital Humidity & Temperature Sensor Module
DHT21 AM2301 Digital Humidity & Temperature Sensor Module
DHT21 / AM2301 Digital Humidity & Temperature Sensor Module
Accurate, reliable, and easy to integrate — the DHT21 (AM2301/AM2301A) is a fully digital, single-bus humidity and temperature sensor module designed for makers, engineers, and hobbyists. Whether you're building a weather station, smart home controller, greenhouse monitor, or data-logging project, this compact sensor delivers precise readings with minimal wiring.
Key Features
- 100% Digital Output: Clean, calibrated digital signal via a single-bus data line — no analog-to-digital conversion needed.
- Single-Bus Connectivity: Simplified wiring with just one data line, making integration with Arduino, Raspberry Pi, ESP8266/ESP32, and other microcontrollers fast and straightforward.
- Relative Humidity Sensing: Polymer capacitive humidity element with excellent long-term stability.
- Temperature Sensing: Integrated NTC temperature module for accurate ambient readings.
- Wide Measurement Range: Humidity 0–99.9% RH; Temperature -40°C to +80°C.
- High Accuracy: ±3% RH humidity accuracy; ±0.5°C temperature accuracy (typical).
- Compatible with AM2301 & AM2301A: Drop-in replacement for standard AM2301/AM2301A modules.
- Polymer Sensor Material: Durable polymer construction with no high-concern chemicals.
- Customizable: Available for OEM/custom applications.
Technical Specifications
| Model | DHT21 / AM2301 / AM2301A |
| Output Type | Digital (Single-Bus) |
| Humidity Range | 0 – 99.9% RH |
| Temperature Range | -40°C to +80°C |
| Supply Voltage | 3.3V – 5.5V DC |
| Material | Polymer |
| High-Concern Chemicals | None |
| Origin | Made in Mainland China |
What's in the Box
- 1 × DHT21 / AM2301 Digital Humidity & Temperature Sensor Module
Compatible With
- Arduino (Uno, Mega, Nano, etc.)
- Raspberry Pi
- ESP8266 / ESP32
- STM32 and most 3.3V–5V microcontroller platforms
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Frequently Asked Questions
Q: Is the DHT21 AM2301 sensor compatible with Arduino and Raspberry Pi?
A: Yes! The DHT21 / AM2301 sensor uses a standard single-bus digital protocol that is natively supported by popular Arduino and Raspberry Pi libraries (such as the Adafruit DHT sensor library). Simply connect VCC, GND, and the data pin to your microcontroller and you're ready to read humidity and temperature values.
Q: What is the difference between DHT21, AM2301, and AM2301A?
A: These are functionally equivalent sensor models. The DHT21 is the base model designation, while AM2301 and AM2301A are manufacturer variants with the same pin layout and communication protocol. This module is compatible with all three designations and can be used as a direct drop-in replacement.
Q: What voltage does this humidity and temperature sensor require?
A: The DHT21 / AM2301 sensor operates on a supply voltage of 3.3V to 5.5V DC, making it compatible with both 3.3V (ESP8266, ESP32, Raspberry Pi) and 5V (Arduino Uno, Mega) platforms without the need for a level shifter.