DHT22 / AM2302 Digital Temperature & Humidity Sensor Module — ±0.5°C, Arduino

DHT22 / AM2302 Digital Temperature & Humidity Sensor Module — ±0.5°C, -40–80°C, Arduino

The DHT22 (also known as AM2302) is a high-accuracy digital temperature and humidity sensor that delivers calibrated readings over a single-wire serial interface. With ±0.5°C temperature accuracy, ±2% RH humidity accuracy, and a wide range of -40°C to +80°C / 0–100% RH, it significantly outperforms the DHT11 and is the preferred sensor for weather stations, HVAC monitoring, cold chain logging, and precision IoT environmental sensing. This module version includes an onboard pull-up resistor for plug-and-play connection.

Key Specifications

Parameter	Value
Sensor IC	DHT22 / AM2302
Interface	Single-wire serial (proprietary)
Temperature Range	-40°C – +80°C
Temperature Accuracy	±0.5°C
Humidity Range	0% – 100% RH
Humidity Accuracy	±2% RH
Sampling Rate	0.5 Hz (1 reading per 2 seconds)
Supply Voltage	3.3V – 5V
Module Pins	3-pin (VCC, DATA, GND) — onboard pull-up included
Operating Temperature	-40°C to +80°C

DHT22 vs DHT11 — Upgrade Comparison

Feature	DHT22 / AM2302	DHT11
Temperature Range	-40–80°C	0–50°C
Temperature Accuracy	±0.5°C (4× better)	±2°C
Humidity Range	0–100% RH	20–90% RH
Humidity Accuracy	±2% RH (2.5× better)	±5% RH
Sampling Rate	0.5 Hz (every 2 sec)	1 Hz (every 1 sec)
Best for	Outdoor, freezer, high-accuracy IoT	Indoor room monitoring, learning

Why Choose DHT22 / AM2302?

• ±0.5°C accuracy — 4× more accurate than DHT11, suitable for precision environmental monitoring
• -40°C to +80°C range — covers outdoor, freezer, and industrial temperature ranges
• 0–100% RH — full humidity range including condensing environments
• Onboard pull-up resistor — plug directly into MCU GPIO, no external components needed
• Same library as DHT11 — Adafruit DHT library supports both, change DHT11 to DHT22 in one line

Compatible With

• Arduino: Adafruit DHT library — DHT dht(pin, DHT22); dht.readTemperature(); dht.readHumidity();
• ESP32 / ESP8266: Same library, 3.3V compatible
• Raspberry Pi: Adafruit CircuitPython DHT library
• MicroPython: import dht; d = dht.DHT22(Pin(4)); d.measure()
• Home Assistant / ESPHome: dht platform, DHT22 sensor type

Frequently Asked Questions

Q: How do I upgrade from DHT11 to DHT22 in Arduino code?
A: Change only one line: DHT dht(DHTPIN, DHT11); → DHT dht(DHTPIN, DHT22); Everything else remains identical. Also change the delay between readings from 1000ms to 2000ms (DHT22 requires 2 seconds between readings).

Q: Why does DHT22 return NaN or incorrect readings?
A: Common causes: (1) Reading too fast — DHT22 requires at least 2 seconds between readings, add delay(2000). (2) Cable too long — keep DATA wire under 20cm; add 100nF capacitor between VCC and GND near the sensor for longer cables. (3) Power supply noise — add 100μF electrolytic capacitor between VCC and GND.

Q: Can DHT22 measure outdoor temperature and humidity accurately?
A: Yes — DHT22 covers -40°C to +80°C and 0–100% RH, making it suitable for outdoor use. For outdoor installation, place the sensor in a radiation shield (Stevenson screen) to prevent direct sunlight heating the sensor body. Avoid placing near heat sources or in direct airflow from HVAC vents.

Package Contents

• 1× DHT22 / AM2302 Digital Temperature & Humidity Sensor Module (3-pin PCB)

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