When building automated environmental monitoring systems, smart HVAC controllers, or custom weather stations, tracking ambient temperature and relative humidity requires a reliable, pre-calibrated sensor. Standard analog sensors require complex calibration circuits. The AM2301A (also known as DHT21) Digital Temperature & Humidity Sensor Module provides a robust, cost-effective measurement solution, featuring a capacitive humidity sensing element and a precision thermistor paired with an onboard microcomputer for seamless single-bus digital output.
Key Features
Pre-Calibrated Digital Output: Factory-calibrated sensor outputs a processed digital signal via a single-wire interface, eliminating the need for external analog-to-digital conversion circuitry.
Dual-Parameter Measurement: Accurately captures both relative humidity (0% to 99.9% RH) and ambient temperature (-40°C to 80°C).
High Precision & Stability: Delivers dependable long-term stability with tight accuracy tolerances for both climatic and industrial monitoring tasks.
Enclosed Probe Design: Housed in a clean plastic enclosure with integrated air vents, allowing easy external mounting away from your core electronics to minimize heat interference.
Microcontroller Friendly: Fully supported by standard DHT libraries across popular development platforms like Arduino, ESP32, and Raspberry Pi.
Technical Specifications
Feature
Specification
Product Type
Digital Temperature & Humidity Sensor Module
Model / Alternative Name
AM2301A / DHT21
Operating Voltage
3.3V – 5.2V DC
Humidity Measuring Range
0% to 99.9% RH
Temperature Range
-40°C to +80°C
Humidity Accuracy
± 3% RH
Temperature Accuracy
± 0.5°C
Communication Interface
Single-Wire Digital Bus (1-Wire)
Enclosure Dimensions
60 x 27 x 14 mm (L x W x H)
Common Applications
HVAC & Environmental Control: Monitors climate conditions in indoor greenhouses, server rooms, and residential ventilation systems.
DIY Weather Stations & Data Loggers: Connects easily to microcontrollers for long-term meteorological tracking and automated home automation triggers.
Note to customers: Ensure correct wiring polarity (VCC, GND, and Data) and check your microcontroller’s pull-up resistor requirements on the single-bus data line for stable communication!
Weight
1450 g
Dimensions
10 × 10 × 7 cm
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