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7Semi I2C Qwiic SHT40 Temperature & Humidity Sensor

7Semi I2C Qwiic SHT40 Temperature & Humidity Sensor

₹164.00Price
🔍 Overview
The module is based on the Sensirion SHT40 digital temperature and humidity sensor, a high-accuracy, low-power environmental sensor.
  • Measures:
    • Temperature
    • Relative Humidity
  • Provides fully calibrated digital output via I²C
  • Designed for compact, high-precision sensing applications
👉 It is part of Sensirion’s next-generation SHT4x series, offering improved accuracy and reliability.
⚙️ Working Principle
The SHT40 integrates two sensing mechanisms:
🌡️ Temperature Measurement
  • Uses a bandgap temperature sensor
  • Provides precise temperature readings
  • Also used for humidity compensation
💧 Humidity Measurement
  • Uses a capacitive polymer sensing element
  • Absorbs moisture → changes capacitance
  • Converted into digital signal via internal ADC
👉 Both signals are processed using factory calibration data, ensuring accurate output without external calibration.
📊 Measurement Characteristics
Temperature
  • Range: −40°C to +125°C
  • Accuracy: ±0.2°C (typical)
Humidity
  • Range: 0% to 100% RH
  • Accuracy: ±1.8% RH (typical)
Resolution
  • High-resolution digital output (16-bit class)
👉 Suitable for precision environmental monitoring.
⚡ Electrical Characteristics
  • Supply voltage: 1.08V to 3.6V
  • Typical current consumption:
    • ~0.4 µA (idle)
    • ~0.5–1 mA (measurement)
👉 Extremely low power → ideal for battery-powered devices.
🔗 Communication Interface
  • Interface: I²C (two-wire digital communication)
  • Fixed I²C address: 0x44
  • Fast communication with simple command structure
👉 No need for complex register handling (command-based operation).
🧠 Internal Features
✔ Fully Calibrated Output
  • Factory calibration stored in sensor
  • Direct output in:
    • °C (temperature)
    • %RH (humidity)
✔ Integrated Heater
  • Built-in micro-heater
  • Used for:
    • Removing condensation
    • Self-diagnostics
✔ High Repeatability
  • Consistent readings across measurements
  • Low drift over time
✔ Fast Measurement Time
  • Typical measurement time: ~1–10 ms
🔌 Qwiic / STEMMA QT Compatibility
✔ Plug-and-Play I²C Connectivity
  • Uses 4-pin JST SH connector
  • Pins:
    • VCC
    • GND
    • SDA
    • SCL
👉 Enables:
  • Easy daisy-chaining
  • No soldering required
📦 Physical Characteristics
  • Sensor size: ~1.5 × 1.5 × 0.5 mm (IC)
  • Breakout: mini form factor
  • Designed for compact embedded systems
🌡️ Environmental Characteristics
  • Wide operating range:
    • Temperature: −40°C to +125°C
    • Humidity: 0–100% RH
👉 Performs reliably across varying environmental conditions.
🔄 Operating Behavior
✔ Fast & Stable Output
  • Quick response to environmental changes
  • Stable readings with minimal noise
✔ Humidity Compensation
  • Temperature automatically compensates humidity readings
✔ Heater Usage
  • Can periodically activate heater to:
    • Prevent moisture buildup
    • Improve long-term stability
⚠️ Limitations
  • Measures relative humidity only
  • Sensitive to:
    • Condensation (without heater use)
    • Chemical contamination
  • Requires airflow for accurate readings
🧩 Breakout Board Role (7Semi)
The mini breakout board:
  • Provides:
    • Voltage compatibility
    • I²C interface access
  • Includes:
    • Qwiic / STEMMA QT connector
  • Simplifies integration with microcontrollers
🏁 Summary
The 7Semi SHT40 mini breakout is a high-precision environmental sensor module that:
  • Measures temperature and humidity with high accuracy
  • Uses capacitive + bandgap sensing technology
  • Provides fully calibrated digital I²C output
  • Offers very low power consumption
  • Includes heater and fast response capability
  • Is optimized for compact, reliable environmental monitoring systems
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