SKU: SENS-3426
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Elecrow Crowtail HTU21D Humidity & Temperature Sensor Module - I2C Interface

₹569.00 (Inclusive of all taxes)
Out of Stock

The Elecrow Crowtail HTU21D sensor module provides high-accuracy digital humidity and temperature readings via I2C communication, designed for seamless integration with Crowduino, Arduino, Raspberry Pi, and other 5V or 3.3V microcontroller platforms.

Features

  • High-accuracy digital humidity and temperature sensor (HTU21D)
  • Standard I2C digital output interface for easy microcontroller connection
  • Wide operating range: -40°C to 105°C and 0-100% RH
  • Onboard voltage regulator for 5V system compatibility
  • Crowtail-series form factor for plug-and-play use with Elecrow base shields

Out of stock

Description

The Crowtail HTU21D module integrates the Sensirion HTU21D(F) sensor IC, a calibrated digital sensor renowned for its high accuracy and long-term stability. It measures relative humidity with a typical accuracy of ±2% RH and temperature with a typical accuracy of ±0.3°C. The sensor communicates via a standard I2C interface, outputting fully calibrated digital signals.

The module includes an onboard AMS1117 voltage regulator, allowing it to be safely powered from a 5V source while providing the 3.3V required by the HTU21D sensor chip. This design ensures compatibility with common 5V development boards like Arduino Uno and Crowduino, while also supporting native 3.3V logic systems. Its compact Crowtail form-factor allows for quick connection to compatible base shields without soldering.

Key Features

  • Integrates the high-performance Sensirion HTU21D(F) sensor element
  • Provides calibrated digital output for humidity and temperature via I2C
  • Features an onboard 3.3V LDO regulator for 5V system compatibility
  • Offers excellent measurement accuracy and long-term stability
  • Designed with the standard Crowtail connector for plug-and-play functionality
  • Low power consumption, suitable for battery-powered applications
  • Compact and robust PCB construction

Applications

  • Environmental monitoring stations and data loggers
  • HVAC system control and indoor climate monitoring
  • Weather stations and portable meteorological devices
  • IoT sensor nodes for smart home and building automation
  • Precision agriculture and greenhouse monitoring systems

Technical Specifications

KeyValue
Model Name / Core ICCrowtail HTU21D (Sensirion HTU21D(F))
Input Voltage (Operating)5V DC (via onboard regulator)
Sensor Supply Voltage1.5V - 3.6V (regulated onboard)
Humidity Measurement Range0 - 100% RH
Humidity Accuracy (Typical)±2% RH
Temperature Measurement Range-40°C to 105°C
Temperature Accuracy (Typical)±0.3°C
Communication ProtocolI2C
I2C Address0x40 (default)
Response Time5 s
Hysteresis±1% RH
Dimensions (L x W x H)20.0 mm x 20.0 mm x 9.8 mm
Module WeightApprox. 0.02 kg

Frequently Asked Questions

What is the operating voltage of this Crowtail HTU21D module?

The module is designed to be powered by a 5V DC supply via its Crowtail connector. It contains an onboard AMS1117 voltage regulator that steps the 5V input down to the 3.3V required by the Sensirion HTU21D sensor chip. Do not apply voltages higher than 5.5V to the module inputs.

How do I connect and read data from this sensor?

The module uses the standard I2C communication protocol. Connect the module's SDA and SCL pins to your microcontroller's corresponding I2C pins, along with 5V and GND. The default I2C address for the HTU21D is 0x40. You can use popular libraries like Adafruit_HTU21DF or Sensirion's official driver to easily read humidity and temperature values.

Is this sensor compatible with 3.3V systems like Raspberry Pi or ESP32?

Yes, the sensor is fully compatible with 3.3V logic systems. While the module's input power pin is designed for 5V, the I2C communication lines are 3.3V logic level. For use with a 3.3V MCU, you can power the module's VCC pin from a 3.3V source, as the HTU21D IC itself operates from 1.5V to 3.6V. Ensure your 3.3V supply can provide sufficient current.

What is the typical accuracy and response time of the HTU21D sensor?

The Sensirion HTU21D offers high typical accuracy: ±2% RH for humidity and ±0.3°C for temperature. The response time for a step change is approximately 5 seconds. It features excellent long-term stability and low hysteresis (±1% RH), making it suitable for precision monitoring applications.

Package Includes

  • 1 x Elecrow Crowtail HTU21D Humidity & Temperature Sensor Module

Additional Information

Weight 0.02 kg
Dimensions 2 × 2 × 0.98 cm