SKU: SENS-3430
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Sensirion SHT45 Digital Temperature and Humidity Sensor Module - I2C/SPI Interface

₹1,129.00 (Inclusive of all taxes)
Out of Stock

The Sensirion SHT45 is a high-precision digital temperature and humidity sensor module compatible with 3.3V and 5V logic systems like Arduino, Raspberry Pi, ESP32, and STM32. It provides calibrated, low-power environmental sensing via I2C or SPI interface.

Features

  • High-accuracy digital temperature and humidity sensor from Sensirion’s SHT4x series.
  • Dual I2C and SPI communication interface for flexible system integration.
  • Wide 2.5V to 5.5V supply voltage range suitable for battery-powered applications.
  • On-chip calibration with factory-loaded calibration data for immediate, accurate readings.
  • Compact 13mm x 10mm PCB module with configurable I2C address and alert/interrupt pin.

Out of stock

Description

The GY-SHT45 module integrates the Sensirion SHT45 sensor, a MEMS-based digital sensor renowned for its high accuracy and long-term stability in measuring ambient temperature and relative humidity. The sensor utilizes a capacitive polymer sensing element for humidity and a band-gap sensor for temperature, both factory-calibrated and delivered via a digital 16-bit output.

Designed for low power consumption, the module operates efficiently across a broad voltage range, making it ideal for portable and battery-powered environmental monitoring systems. The onboard circuitry includes pull-up/pull-down resistors for the I2C bus and configurable pins for address selection (ADR), hardware reset (RST), and alert output (ALR), simplifying integration into microcontroller-based projects and industrial automation networks.

Key Features

  • High-precision sensing with excellent long-term stability and factory calibration.
  • Dual digital interface support (I2C up to 1 MHz, SPI) for design flexibility.
  • Ultra-low power consumption optimized for battery-operated devices and wireless sensor nodes.
  • Wide operating voltage range (2.5V to 5.5V DC) compatible with 3.3V and 5V logic families.
  • Compact, surface-mount PCB module with a durable build for reliable performance.
  • Configurable I2C address (0x44 or 0x45) via ADR pin to avoid bus conflicts.
  • Integrated alert/interrupt (ALR) pin for threshold-based system notifications.
  • Hardware reset (RST) pin for reliable system recovery and power cycling.

Applications

  • Precision environmental monitoring systems and weather stations.
  • HVAC (Heating, Ventilation, and Air Conditioning) control and building automation.
  • Industrial process monitoring and automation for quality control.
  • Battery-powered IoT sensor nodes and portable data loggers.
  • Consumer electronics for indoor air quality and comfort sensing.

Technical Specifications

Manufacturer Part NumberSHT45
Sensor TypeDigital Temperature & Humidity
Measurement Range (Temperature)-40°C to +125°C
Measurement Range (Humidity)0% to 100% RH
Supply Voltage2.5V to 5.5V DC
Communication InterfaceI2C, SPI
Default I2C Address0x44 (configurable to 0x45)
Dimensions (L x W)13 mm x 10 mm
Weight5 g
Operating Temperature-40°C to +125°C

Frequently Asked Questions

What is the operating voltage range for the SHT45 sensor module?

The module supports a wide supply voltage range from 2.5V to 5.5V DC. This makes it directly compatible with both 3.3V microcontrollers (like Raspberry Pi or ESP32) and 5V systems (like most Arduino boards) without requiring a logic level shifter.

How do I change the I2C address of the SHT45 module?

The default I2C address is 0x44, set by the internal pull-down resistor on the ADR pin. To change the address to 0x45, you must connect the ADR pin on the module to the positive supply voltage (Vin). This allows multiple sensors to be used on the same I2C bus.

Does this sensor require calibration before use?

No, the Sensirion SHT45 sensor is factory calibrated, and the unique calibration data is stored on-chip. The module provides accurate temperature and humidity readings immediately upon power-up without requiring any user calibration.

What is the function of the ALR (Alert) pin on the module?

The ALR pin is an open-drain alert output. You can program the sensor to trigger this pin (pull it low) when measured temperature or humidity values exceed user-defined high or low thresholds. This allows for efficient, interrupt-driven system design without constant polling.

Package Includes

  • 1 x GY-SHT45 Digital Temperature and Humidity Sensor Module

Additional Information

Weight 0.005 kg
Dimensions 1.3 × 1 cm