Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	DHT22 / AM2302
Interface	Single-Bus Digital
Temperature Range	-40°C to +80°C
Humidity Range	0% to 100% RH
Temperature Accuracy	±0.5°C
Humidity Accuracy	±2% RH
Operating Voltage	3.3V to 6V DC
Sampling Period	2 Seconds
Pin Count	4 Pins
Application	Arduino, Raspberry Pi, IoT Projects

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Easy to integrate

Plug and play with the standard libraries. The single-bus interface saves GPIO pins on my ESP32 project. Packaging was secure and delivery was fast.

Anonymous

Mar 18, 2026

Rating: 5/5

Best value humidity sensor

Compared to other sensors in this price range, the DHT22 offers the best balance of cost and precision. It handles high humidity environments without fogging up.

Anonymous

Mar 12, 2026

Rating: 5/5

Perfect for my weather station

This DHT22 module works flawlessly with my Arduino setup. The readings are consistent and much more accurate than the cheaper DHT11 I used before. Highly recommended for serious hobbyists.

Anonymous

Mar 10, 2026

Rating: 4/5

Reliable data

Using three of these in different rooms. They all report similar baseline values which gives me confidence in their calibration. One star off because the plastic casing feels a bit fragile.

Anonymous

Mar 04, 2026

Rating: 5/5

Great for beginners

I was worried about wiring this up, but the module comes with clear pinouts. Plenty of tutorials online helped me get it running in minutes. Very satisfied.

Anonymous

Mar 04, 2026

Rating: 4/5

Good sensor, slow sampling

The accuracy is great for monitoring my greenhouse humidity. Just remember it only updates every 2 seconds, so don't expect real-time rapid changes. Otherwise, a solid component.

5 FAQ

Q: Why am I getting NaN values in my code?

A: NaN usually indicates a wiring issue or insufficient delay between readings. Please check your connections and ensure you wait at least 2 seconds between each sensor read request as per the datasheet.

Q: Can I use this outdoors in the rain?

A: The sensor itself is not waterproof. While it can measure outdoor air conditions, it must be housed in a breathable, weatherproof enclosure to protect it from direct rain and moisture accumulation.

Q: Is this compatible with 5V logic levels?

A: Yes, the DHT22 operates between 3.3V and 6V, so it is fully compatible with 5V microcontrollers like the Arduino Uno without needing a level shifter.

Q: Does this come with a pull-up resistor installed?

A: Most modules include a built-in pull-up resistor on the data line. However, if your specific board does not have one visible, you may need to add a 10kΩ resistor externally between VCC and Data.

Q: What is the maximum cable length recommended for this sensor?

A: For reliable data transmission, we recommend keeping the cable length under 20 meters. If you need longer distances, consider using a shielded cable or a signal booster.

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