SHT45 Digital Humidity and Temperature Sensor Probe
SHT45 Humidity & Temperature Sensor
Overview
High-precision digital temperature & humidity sensor
Part of Sensirion SHT4x series
Comes as a probe-type module (with cable)
Ideal for industrial, environmental, and scientific applications
Compatible with Arduino, ESP32, Raspberry Pi (I2C interface)
Working Principle
Uses capacitive humidity sensing element
Uses bandgap temperature sensor for temperature measurement
Internal ADC converts signals into digital data
Data transmitted via I2C interface
Fully calibrated & temperature-compensated output
ty Range: 0 100% RH
Humidity Accuracy: 1.0% RH
Temperature Range: -40C to 125C
Temperature Accuracy: 0.1C
Operating Voltage: 1.08V 3.6V
Interface: I2C (digital output)
Response Time: ~4 sec (typical)
Power Consumption: Ultra-low
Protection: Probe housing (dust & moisture resistant)
Pin Configuration (Typical I2C)
VCC 3.3V
GND Ground
SDA Data line
li
Fully factory calibrated
Excellent long-term stability
Fast measurement & response
Resistant to condensation and harsh environments
Compact probe for remote sensing
Applications
Weather stations
HVAC systems
Industrial monitoring
Greenhouses & agriculture
Data loggers & IoT systems
Cold storage monitoring
Usage Tips
Use pull-up resistors (4.7k) on I2C lines if needed
Avoid direct exposure to water droplets
Place probe in ventilated area for accurate RH
in noisy environments
Advantages
Extremely accurate and reliable
Digital output no calibration needed
Low power great for battery systems
Long lifespan and stability
Limitations
Higher cost than basic sensors (like DHT11)
Requires I2C communication setup
Sensitive to extreme contamination (chemicals, dust)
Summary
A high-end digital humidity & temperature sensor
Provides very accurate (1% RH, 0.1C) readings
Uses I2C digital interface
Ideal for precision moni