SmartElex TEMT6000 Ambient Light Sensor Breakout

SmartElex TEMT6000 ambient light sensor breakout, based on the Vishay TEMT6000 phototransistor for measuring ambient light levels.

Overview

The SmartElex TEMT6000 Ambient Light Sensor Breakout is based on the Vishay TEMT6000 phototransistor, designed to measure ambient visible light intensity.

• Outputs an analog voltage proportional to light level

• Spectral sensitivity is close to the human eye response

• Used for simple, real-time light sensing

It is a linear analog light sensor, not a digital lux meter.

Working Principle

Phototransistor-Based Sensing

• The TEMT6000 phototransistor detects incident light

• Light photons generate charge carriers (photocurrent)

Signal Conversion

• The photocurrent flows through a resistor converted to voltage output

More light higher current higher output voltage

Measurement Characteristics

• Spectral range: ~360 nm to 970 nm (visible + near IR)

• Peak sensitivity: ~570 nm (green light, close to human eye response)

Light Response

• Linear response over a wide range

• Can detect:

  • Low indoor lighting

  • Bright outdoor light

Output is relative, not directly in lux.

Electrical Characteristics

• Supply voltage: 3.3V to 5V

• Output type: Analog voltage

• Very low power consumption

Output Behavior

• Dark near 0V output

• Bright light output approaches

  • Light intensity

  • Load resistor value (on breakout board)

  Interface

  Typical 3-pin configuration:

  • VCC Power supply

  • GND Ground

  • OUT Analog voltage output

  Connect OUT to:

  • Microcontroller ADC pin for measurement

  Internal Features

  Human Eye Matching

  • Designed to approximate photopic vision curve

  • More accurate than simple LDR for visible light

  Fast Response

  • Response time: microseconds range

  • Suitable for real-time light changes

  Linear Output

  • Analog output proportional to light intensity

  • Easier for signal processing compared to LDR

    • Responds instantly to changes in light

    • Suitable for dynamic environments

    Environmental Influence

    • Affected by:

      • Light angle

      • Distance from light source

      • Presence of IR light

    Limitations

    • Does not provide direct lux value (needs calibration)

    • Sensitive to:

      • Infrared light (not fully filtered)

    • Cannot:

      • Detect color

      • Separate light sources

    Functional Role

    The module acts as a:

    • Analog ambient light sensor

    • Light intensity monitor

    • Input device for brightness-based control systems

    Summary

    The SmartElex TEMT6000 Breakout that:

    • Uses a phototransistor-based sensing method

    • Provides analog voltage output proportional to light

    • Matches human eye sensitivity reasonably well

    • Operates at low power with fast response

    • Is ideal for real-time light intensity detection