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7Semi OPT3004 Digital Ambient Light Sensor Breakout with I2C STEMMA QT / Qwiic

7Semi OPT3004 Digital Ambient Light Sensor Breakout with I2C STEMMA QT / Qwiic

₹218.00Price
🔍 Overview
The module is based on the Texas Instruments OPT3004, a high-precision digital ambient light sensor (ALS) designed to measure visible light intensity (lux).
  • Acts as a single-chip lux meter
  • Spectral response closely matches the human eye
  • Designed for accurate real-world light measurement
👉 Unlike simple photoresistors, it provides calibrated digital lux output.
⚙️ Working Principle
🌞 Photodiode-Based Light Detection
  • Uses an integrated photodiode
  • Converts incoming light → electrical signal
🎯 Optical Filtering
  • Includes precision optical filter
  • Matches human eye response curve (photopic response)
  • Rejects infrared (IR) radiation (>99%)
👉 This ensures:
  • Accurate readings under sunlight
  • Minimal error from IR sources
🔄 Automatic Gain Control
  • Built-in auto-ranging system
  • Adjusts sensitivity automatically
👉 Allows measurement across very wide light levels without manual tuning.
📊 Measurement Characteristics
  • Light range: 0.01 lux to 83,000 lux
  • Resolution: up to 0.01 lux
  • Dynamic range: 23-bit effective
👉 Covers:
  • Very low light (dark rooms)
  • Bright daylight conditions
🎯 Accuracy & Response
  • High accuracy with human-eye matched spectral response
  • Typical accuracy: ~±1.5% at 100 lux
  • Strong IR rejection ensures consistent readings across light sources
⚡ Electrical Characteristics
  • Supply voltage: 1.6V to 3.6V
  • Operating current: ~1.8 µA (typical)
  • Very low power → suitable for battery systems
🔗 Communication Interface
  • Interface: I²C (two-wire digital communication)
  • Typical speed: up to 1 MHz
Data Output
  • Direct lux value output
  • No external calibration required
🧠 Internal Features
✔ Automatic Full-Scale Range
  • Adjusts gain automatically
  • Prevents saturation in bright light
✔ Programmable Interrupt
  • Generates interrupt when:
    • Light exceeds threshold
  • Useful for event-driven systems
✔ Digital Signal Processing
  • Converts raw photodiode signal → linear lux output
  • Compensates environmental variations
🔌 STEMMA QT / Qwiic Interface
✔ Plug-and-Play I²C Connectivity
  • Uses 4-pin JST connector
  • Pins:
    • VCC
    • GND
    • SDA
    • SCL
👉 Benefits:
  • No soldering required
  • Easy daisy-chaining of multiple sensors
📦 Physical Characteristics
  • Sensor IC size: ~2.0 × 2.0 × 0.65 mm
  • Breakout board size: ~27 × 20 mm
  • Compact and lightweight
🌡️ Environmental Characteristics
  • Operating temperature: −40°C to +85°C
  • Stable across varying lighting environments
🔄 Operating Behavior
✔ Wide Range Adaptability
  • Automatically adjusts between:
    • Dark environments
    • Bright sunlight
✔ Light Source Independence
  • Accurate under:
    • LED
    • Fluorescent
    • Sunlight
👉 Due to strong IR rejection and spectral matching
⚠️ Limitations
  • Measures visible light only (lux)
  • Cannot:
    • Identify light color
    • Measure UV or IR levels
  • Accuracy depends on:
    • Sensor placement
    • Obstruction/shadowing
🧩 Breakout Board Role (7Semi)
The breakout board:
  • Provides:
    • Voltage compatibility (3.3V / 5V systems)
    • I²C access via header + Qwiic/STEMMA QT
  • Simplifies integration with embedded systems
🏁 Summary
The 7Semi OPT3004 breakout is a high-accuracy ambient light sensing module that:
  • Measures visible light intensity in lux
  • Uses photodiode + optical filtering + digital processing
  • Offers 23-bit dynamic range with auto gain
  • Provides low-power digital I²C output
  • Ensures accurate human-eye-like light measurement
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