Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	AM2301A / DHT21
Interface Type	Single-Wire Digital
Humidity Range	20% to 90% RH
Temperature Range	-40°C to 80°C
Humidity Accuracy	±5% RH
Temperature Accuracy	±0.5°C
Operating Voltage	3.3V to 5.5V DC
Sampling Period	2 seconds
Pin Count	3 Pins (VCC, Data, GND)
Package Type	Through-Hole Module

6 reviews

Anonymous

Mar 21, 2026

Rating: 5/5

Perfect for Arduino projects

This sensor works flawlessly with my Arduino Uno. The single-wire interface makes wiring incredibly simple, and the readings are consistent when compared to my standalone hygrometer.

Anonymous

Mar 21, 2026

Rating: 4/5

Good for indoor plant monitoring

I used this to monitor humidity in my greenhouse controller. It's accurate enough for general purposes, though it takes a few seconds to stabilize after power-on.

Anonymous

Mar 17, 2026

Rating: 4/5

Solid performance

Works well inside my smart home enclosure. Just remember not to sample faster than once every 2 seconds or you will get null values.

Anonymous

Mar 08, 2026

Rating: 5/5

Reliable and cost-effective

Great replacement for the older DHT11. The improved accuracy and wider temperature range make it suitable for more serious environmental logging applications.

Anonymous

Mar 03, 2026

Rating: 5/5

Easy to code for

Found plenty of libraries online to get this running with ESP32 immediately. No calibration needed out of the box for my science fair project.

Anonymous

Mar 03, 2026

Rating: 5/5

Exactly as described

Arrived quickly and matched the pinout diagram perfectly. The module form factor saves time compared to soldering the raw sensor component.

5 FAQ

Q: What is the maximum cable length recommended?

A: For reliable data transmission, we recommend keeping the cable length under 20 meters. Longer distances may require signal buffering.

Q: Does this come with a waterproof casing?

A: No, this specific model is not waterproof. If you need outdoor usage, please look for our DHT22 models with specialized protective housings.

Q: Can I power this with 3.3V logic?

A: Absolutely. The operating voltage range is 3.3V to 5.5V, making it safe for both 3.3V and 5V microcontroller systems.

Q: Is this compatible with Raspberry Pi GPIO?

A: Yes, it is fully compatible with Raspberry Pi. You will need a pull-up resistor on the data line, which many breakout modules already include.

Q: How often should I calibrate this sensor?

A: The AM2301A/DHT21 is factory calibrated and typically does not require user recalibration during its standard lifespan under normal conditions.

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