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7Semi SHT45 Humidity & Temperature Sensor Breakout Board with 4-Pin Connector

7Semi SHT45 Humidity & Temperature Sensor Breakout Board with 4-Pin Connector

₹823.00Price
🔍 Overview
The breakout is based on the Sensirion SHT45 digital humidity and temperature sensor, a high-accuracy environmental sensor from the SHT4x series.
  • Measures:
    • Temperature
    • Relative Humidity
  • Provides fully calibrated digital output via I²C
  • Designed for precision applications requiring very low error and high stability
👉 Compared to earlier SHT sensors, the SHT45 offers higher accuracy and better long-term reliability.
⚙️ Working Principle
The sensor integrates two sensing technologies:
🌡️ Temperature Measurement
  • Based on a bandgap temperature sensor
  • Provides accurate temperature readings
  • Used for internal compensation of humidity values
💧 Humidity Measurement
  • Uses a capacitive polymer sensing element
  • Absorbs water vapor → changes capacitance
  • Internal ADC converts this into digital RH value
👉 Both measurements are corrected using factory calibration coefficients stored in memory.
📊 Measurement Characteristics
Temperature
  • Range: −40°C to +125°C
  • Accuracy: ±0.1°C (typical)
Humidity
  • Range: 0% to 100% RH
  • Accuracy: ±1.0% RH (typical)
Resolution
  • High-resolution 16-bit digital output
👉 Among the most accurate sensors in its class.
⚡ Electrical Characteristics
  • Supply voltage: 1.08V to 3.6V
  • Typical current:
    • Idle: ~0.4 µA
    • Measurement: ~0.5–1 mA
👉 Extremely low power consumption → suitable for battery-operated devices.
🔗 Communication Interface
  • Interface: I²C (two-wire digital communication)
  • Fixed I²C address: 0x44
  • Command-based operation (simple read commands)
👉 No complex register mapping required.
🧠 Internal Features
✔ Factory Calibration
  • Each sensor individually calibrated
  • Outputs:
    • Direct temperature (°C)
    • Direct humidity (%RH)
✔ Integrated Heater
  • Built-in micro-heater
  • Used for:
    • Removing condensation
    • Preventing moisture buildup
    • Self-diagnostics
✔ High Repeatability & Low Drift
  • Excellent long-term stability
  • Minimal recalibration needed
✔ Fast Measurement Time
  • Measurement duration: ~1–10 ms
🔌 4-Pin Connector Interface
Typical pin configuration:
  • VCC → Power supply
  • GND → Ground
  • SDA → I²C data
  • SCL → I²C clock
👉 The 4-pin connector simplifies:
  • Wiring
  • Integration into embedded systems
📦 Physical Characteristics
  • Sensor IC size: ~1.5 × 1.5 × 0.5 mm
  • Breakout board: compact form factor
  • Designed for:
    • Embedded systems
    • Compact environmental sensing
🌡️ Environmental Characteristics
  • Operating temperature: −40°C to +125°C
  • Humidity range: 0–100% RH (non-condensing preferred)
👉 Maintains accuracy across wide environmental conditions.
🔄 Operating Behavior
✔ Fast Response
  • Quick reaction to environmental changes
✔ Temperature Compensation
  • Internal compensation improves humidity accuracy
✔ Heater Usage
  • Can be activated periodically to:
    • Improve reliability in humid environments
    • Reduce sensor contamination
⚠️ Limitations
  • Measures relative humidity only
  • Sensitive to:
    • Condensation (without heater usage)
    • Chemical contamination
  • Requires proper airflow for best accuracy
🧩 Breakout Board Role (7Semi)
The breakout board:
  • Provides:
    • Stable power routing
    • I²C interface access
  • Uses 4-pin connector for easy integration
  • Simplifies usage of the SHT45 IC in embedded systems
🏁 Summary
The 7Semi SHT45 breakout board is a high-precision environmental sensing module that:
  • Measures temperature and humidity with very high accuracy
  • Uses capacitive humidity + bandgap temperature sensing
  • Provides fully calibrated digital I²C output
  • Offers ultra-low power consumption
  • Includes heater for reliability in humid conditions
  • Is optimized for high-accuracy and long-term stable measurements
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