Generic GY-213V-SI7021 Temperature and Humidity Sensor Module - I2C Interface

Name: Generic GY-213V-SI7021 Temperature and Humidity Sensor Module - I2C Interface
Brand: Generic
SKU: SENS-3356
Price: 1229.00 INR
Availability: OutOfStock

₹1,229.00 (Inclusive of all taxes)

Out of Stock

The GY-213V-SI7021 is a compact I2C temperature and humidity sensor module based on the Sensirion SI7021-A20 IC, offering high-precision environmental monitoring for integration with Arduino, Raspberry Pi, ESP32, and STM32 platforms.

Features

High-precision Sensirion SI7021-A20 sensor IC for combined temperature and humidity measurement.
I2C digital interface with a default address of 0x40 for simple microcontroller integration.
Wide operating voltage range of 2.7V to 5.5V DC, compatible with 3.3V and 5V logic systems.
Excellent temperature accuracy of ±0.2°C and humidity accuracy of ±2% RH (typical).
Extended operating temperature range from -40°C to +125°C for demanding environments.

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Description

The GY-213V-SI7021 module integrates the Sensirion SI7021-A20, a factory-calibrated CMOSens® chip that provides calibrated, digital output for relative humidity and temperature. The sensor utilizes a polymer-based capacitive sensing element for humidity and a band-gap temperature sensor, ensuring low drift and high stability. The integrated signal conditioning and analog-to-digital converter deliver a clean, ready-to-use digital signal via the I2C bus.

Designed for embedded applications, the module’s compact PCB footprint facilitates easy integration into weather stations, HVAC control systems, data loggers, and IoT devices. Its wide supply voltage range and low power consumption make it suitable for both battery-powered and line-powered systems requiring reliable environmental data.

Key Features

Core sensing by Sensirion's high-reliability SI7021-A20 digital sensor IC.
Simultaneous temperature and relative humidity measurement with fast response time.
Fully calibrated digital output eliminates the need for user calibration.
Excellent long-term stability and minimal hysteresis for consistent readings.
Robust operating range from -40°C to +125°C and 0% to 100% RH (non-condensing).
Low power consumption suitable for portable and wireless sensor nodes.
Compact, ready-to-use module with a standard 4-pin header for I2C connection.
High-value build optimized for professional prototyping and embedded system integration.

Applications

Precision indoor climate monitoring and HVAC system control.
Environmental data logging for weather stations and agricultural monitoring.
Asset condition monitoring in industrial settings (e.g., server rooms, manufacturing).
IoT and smart home devices for comfort and energy efficiency optimization.
Portable data loggers and wearable devices requiring environmental sensing.

Technical Specifications

Sensor IC	Sensirion SI7021-A20
Measurement Parameters	Temperature, Relative Humidity
Temperature Range	-40°C to +125°C
Temperature Accuracy (Typical)	±0.2°C
Humidity Range	0% to 100% RH
Humidity Accuracy (Typical)	±2% RH
Operating Voltage	2.7V to 5.5V DC
Communication Interface	I2C (Default Address 0x40)
Module Dimensions (L x W)	15.5 mm x 14.6 mm
Module Weight	Approx. 0.2 g

Frequently Asked Questions

What is the default I2C address of the GY-213V-SI7021 module?

The module uses the Sensirion SI7021-A20 sensor, which has a fixed 7-bit I2C address of 0x40 (hexadecimal). This address is hard-coded and cannot be changed, so only one module can be used per I2C bus without an external multiplexer.

What is the operating voltage range, and is it 5V tolerant?

The module operates from 2.7V to 5.5V DC, making it compatible with both 3.3V and 5V microcontroller systems. The SI7021 sensor IC itself is rated for 1.9V to 3.6V, but the module includes necessary level-shifting circuitry to safely accept a 5V supply and communicate with 5V logic I2C lines.

How accurate are the temperature and humidity readings?

Typical accuracy is ±0.2°C for temperature and ±2% RH for relative humidity under normal conditions (0-80% RH, 10-50°C). Maximum specified accuracy for the SI7021-A20 is ±0.4°C and ±3% RH across the full operating range. The sensor is factory calibrated.

Can this sensor be used outdoors or in condensing environments?

While the sensor operates from -40°C to 125°C, it is designed for non-condensing environments. Prolonged exposure to condensation or liquid water can damage the sensing element. For outdoor use, a protective, breathable enclosure is recommended to shield the PCB from direct moisture while allowing air exchange.