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7Semi SGP40 VOC Sensor Breakout for Indoor Air Quality 2.54mm Pitch

7Semi SGP40 VOC Sensor Breakout for Indoor Air Quality 2.54mm Pitch

₹796.00Price
🌿 7Semi SGP40 VOC Sensor Breakout (2.54mm Pitch) — Technical Information
🔍 Overview
The module is based on the Sensirion SGP40 VOC gas sensor IC, a digital air quality sensor designed to detect:
  • Volatile Organic Compounds (VOC)
  • Indoor air quality changes
👉 It provides a processed VOC index output, making it easier to interpret air quality conditions.
⚙️ Working Principle
🧪 MOX (Metal-Oxide) Gas Sensing
  • Uses a metal-oxide sensing layer with micro-heater
  • Operates on CMOSens® technology
🔄 Detection Process
  • Heater activates sensing surface
  • VOC gases interact with metal-oxide layer
  • Resistance changes
  • Internal ADC converts signal → digital output
👉 Measures broad VOC mixture, not specific gases.
🧠 VOC Index Algorithm
  • Raw signal is processed into a VOC Index
  • Index represents:
    • Relative air quality changes
👉 Works like a digital indicator of air quality trends.
📊 Measurement Characteristics
VOC Detection
  • Detects:
    • Alcohol vapors
    • Smoke
    • Household chemicals
Response Time
  • Fast response (<10 seconds typical)
Output Type
  • Raw signal (16-bit)
  • Processed VOC Index
⚡ Electrical Characteristics
  • Supply voltage: ~3.3V
  • Current consumption: low (mA range due to heater)
👉 Suitable for continuous monitoring systems.
🔗 Communication Interface
  • Interface: I²C (digital communication)
  • Typical address: 0x59
2.54mm Pitch Advantage
  • Standard breadboard-compatible header spacing
  • Easy integration with embedded systems
🧠 Internal Features
✔ On-Chip Humidity Compensation
  • Adjusts readings based on:
    • Temperature
    • Humidity
  • Improves accuracy
✔ Micro-Hotplate Technology
  • Provides stable sensing environment
  • Ensures consistent performance
✔ Long-Term Stability
  • Designed for continuous operation
  • Low drift over time
✔ Low Power Operation
  • Suitable for IoT and embedded applications
🔄 Operating Behavior
✔ Relative Air Quality Measurement
  • Outputs VOC index (not absolute ppm)
  • Indicates:
    • Air quality improving or worsening
✔ Warm-Up Time
  • Requires initial stabilization
✔ Continuous Monitoring
  • Provides real-time air quality trends
🌡️ Environmental Characteristics
  • Operating temperature: −10°C to 50°C
  • Humidity range: 0–90% RH
⚠️ Limitations
  • Cannot identify specific gases
  • Provides relative index, not exact concentration
  • Sensitive to environmental changes
🔌 Typical Pin Configuration
  • VCC → 3.3V
  • GND → Ground
  • SDA → I²C data
  • SCL → I²C clock
🧩 Functional Role
The module acts as a:
  • VOC gas sensor
  • Indoor air quality monitor
  • Digital environmental sensing component
🏁 Summary
The 7Semi SGP40 (2.54mm pitch) breakout is a compact digital air quality sensor that:
  • Uses MOX gas sensing technology
  • Detects VOC levels via relative index
  • Provides I²C digital output
  • Includes humidity compensation and onboard processing
  • Is ideal for indoor air quality monitoring systems
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