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
📊 Key Specifications
🔹 Humidity Range: 0 – 100% RH
🔹 Humidity Accuracy: ±1.0% RH
🔹 Temperature Range: -40°C to 125°C
🔹 Temperature Accuracy: ±0.1°C
🔹 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
🟢 SCL → Clock line
🔄 Features
Ultra-high accuracy (industry-grade)
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 (4.7kΩ) on I²C lines if needed
Avoid direct exposure to water droplets
Place probe in ventilated area for accurate RH
Keep cable length reasonable for stable I²C communication
Use shielded cable 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, ±0.1°C) readings
Uses I²C digital interface
Ideal for precision monitoring and industrial applications