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SHT45 Datasheet
Arduino Library

High Precision Humidity and Temperature Sensor Probe for Industrial and Environmental Monitoring
The 7Semi SHT45 Digital Humidity and Temperature Sensor Probe is built for applications that demand accurate, repeatable environmental data over long periods of use. Using a capacitive polymer sensing element and a 16-bit digital output, the probe measures temperature with an accuracy of +/-0.1 C and relative humidity with an accuracy of +/-1.0% RH. The I2C interface allows straightforward connection to microcontrollers and development boards, making it a practical choice for engineers building climate-monitoring systems, IoT devices, and automated control setups.
Housed in a ventilated stainless-steel probe and fitted with a 1-metre cable, this sensor is well-suited for remote installations where the main controller needs to be kept away from the sensing point. It covers a wide operating range of -40 C to +125 C and 0% to 100% RH, making it suitable for HVAC systems, greenhouses, weather stations, cold storage units, and indoor air-quality monitoring. For best long-term accuracy, the sensor should ideally be operated within 5 C to 60 C and 20% RH to 80% RH, since extended exposure to extreme humidity levels may cause a temporary offset in the RH reading.
Key Features

Measurement Accuracy: +/-1.0% RH and +/-0.1 C for reliable, repeatable readings
Sensing Range: 0-100% RH and -40 C to +125 C for wide-ranging environmental use
Power Efficiency: Ultra-low power draw, suitable for battery-powered and low-power designs
Fast Digital Output: 16-bit resolution with CRC checking over I2C for data integrity
Probe Housing: Ventilated stainless-steel casing for durability in humid or outdoor conditions
Cable Length: 1-metre cable for remote sensing away from the control unit
Interface: Four-wire I2C connection for easy integration with microcontrollers and development boards

Customisation: Length of the wire, length of stainless steel probe and thickness of the steel probe can be customised for quantity orders. Contact [email protected] for more details
Applications

HVAC and building climate-control systems
Greenhouse and agricultural environment monitoring
Weather stations and outdoor environmental logging
Cold-storage and warehouse humidity tracking
Indoor air-quality and data-centre monitoring
Industrial process control requiring precise humidity and temperature data