Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Interface	I2C
Supply Voltage	1.5V ~ 3.6V DC
Temperature Range	-40°C to +125°C
Humidity Range	0% to 100% RH
Temperature Accuracy	±0.3°C (at 25°C)
Humidity Accuracy	±2% RH (20-80% RH)
Response Time	5s (63% RH step)
Package Type	DFN-6 Surface Mount
Dimensions	3mm x 3mm x 1.1mm
Application	HVAC, Weather Stations, IoT Devices

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Easy to use for beginners

Found plenty of example code online. Connected it to my ESP32 and had data logging up and running in under an hour.

Anonymous

Mar 21, 2026

Rating: 4/5

Good precision, low power

Power consumption is very low, which is great for battery-operated nodes. Temperature reading is spot on; humidity is within expected tolerance.

Anonymous

Mar 05, 2026

Rating: 5/5

Reliable humidity monitoring

I used these in a custom controller for my greenhouse. They handle high humidity environments well without drifting significantly over time.

Anonymous

Mar 04, 2026

Rating: 4/5

Great value, small footprint

The DFN package is tiny, so soldering requires a steady hand or a hot air station. Once mounted, performance is solid for the price point.

Anonymous

Mar 04, 2026

Rating: 5/5

Perfect for my weather station project

These sensors are incredibly accurate and easy to interface with an Arduino using the I2C library. The readings stabilize quickly and match my calibrated reference meter.

Anonymous

Mar 01, 2026

Rating: 5/5

Consistent performance

Bought a batch of ten for a distributed sensing network. All units performed consistently out of the box with minimal calibration needed.

5 FAQ

Q: Is this sensor suitable for outdoor use?

A: The sensor itself is not waterproof. If used outdoors, it must be housed in a breathable enclosure that protects against rain and direct sunlight while allowing air flow.

Q: What is the I2C address for this sensor?

A: The default I2C address for the HTU21D/HTU20D is typically 0x40. Please refer to the datasheet for details on changing this if supported by your specific variant.

Q: How long does it take to get a new reading?

A: The conversion time depends on the resolution setting. At highest resolution, it takes approximately 50ms for temperature and 16ms for humidity measurements.

Q: Can I use this with a 5V Arduino Uno directly?

A: No, the operating voltage is 1.5V to 3.6V. You must use a logic level shifter or run your microcontroller at 3.3V to avoid damaging the sensor.

Q: Does this module come with pull-up resistors for the I2C lines?

A: This is the bare sensor module. While some breakout boards include pull-up resistors, this specific item typically requires you to add external 4.7kΩ pull-up resistors to your SDA and SCL lines.

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