DHT22/AM2302 Digital Temperature & Humidity Sensor (Non-original)

Description

The DHT22 / AM2302 (Non-Original) is a cost-effective digital temperature and humidity sensor that replicates the functionality of the original ASAIR DHT22 at a more accessible price point. It combines a capacitive humidity sensing element with an NTC thermistor and an integrated 8-bit microcontroller, delivering digital output over a simple single-wire interface.

The sensor offers the same measurement ranges and resolution as the original DHT22: humidity from 0% to 100% RH with ±2% RH accuracy (at 25°C, 50% RH), and temperature from -40°C to +80°C with ±0.5°C accuracy . Resolution is 0.1°C and 0.1% RH. The sensor operates from 3.3V to 5.5V DC, drawing an average of 0.5mA during measurement and entering a 100µA standby mode between readings.

The Non-Original designation indicates this is a third-party manufactured variant. While it shares the same pinout, communication protocol, and basic specifications as the original ASAIR chip, it may exhibit greater unit-to-unit variation, slightly reduced long-term stability, and less consistent batch-to-batch performance. It is factory-calibrated, but the calibration quality may vary compared to the original.

Important Note: The DHT22 (Non-Original) requires a minimum 2-second interval between readings — querying more frequently will return errors . A pull-up resistor (typically 5.1kΩ–10kΩ) on the data line is required for reliable communication; many module versions include this onboard, but bare sensors require an external resistor . The sensor is not waterproof and should be kept dry. For critical applications requiring guaranteed accuracy and long-term stability, the original ASAIR DHT22 is recommended.

Whether you are building a weather station, a greenhouse controller, or an educational project, the DHT22 (Non-Original) provides a cost-effective entry point for high-accuracy digital environmental sensing.

Features

• Non-original AM2302 sensor — Cost-effective third-party alternative to the original ASAIR chip

• High accuracy — ±2% RH and ±0.5°C, significantly better than DHT11

• Wide measurement range — 0–100% RH and -40°C to +80°C

• Single-wire digital interface — Only one data pin required, plus power and ground

• Factory-calibrated — Calibration coefficients stored on-chip; no external trimming

• Low power consumption — ~0.5mA measuring, ~100µA standby

• 4-pin package — Standard 0.1″ spacing, breadboard and PCB compatible

• Wide application range — Weather stations, HVAC, agriculture, industrial control, home automation

• Cost-effective — Affordable solution for high-accuracy sensing in volume projects

Technical Specifications