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Adafruit VCNL4040 Proximity and Lux Sensor - STEMMA QT

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Adafruit VCNL4040 Proximity and Lux Sensor - STEMMA QT

The Adafruit VCNL4040 is a two-in-one proximity and ambient light sensor from Vishay. It measures proximity from 0 to 200 mm (~7.5 inches) using an on-board IR LED, and ambient light from 0.0125 to 6,553 lux — all over a simple I2C interface.

The breakout includes 3.3V and 5V level-shifting circuitry for compatibility with both Feather/Raspberry Pi (3.3V) and Arduino/Metro (5V) platforms. Two STEMMA QT / Qwiic connectors provide solderless I2C connection and easy daisy-chaining with other sensors.

Key Features

  • Proximity Sensor – 0 to 200 mm range with adjustable IR LED current and duty cycle
  • Ambient Light Sensor – 0.0125 to 6,553 lux (at 80 ms integration time)
  • Adjustable Integration Time – 80 ms to 640 ms; longer times increase sensitivity and resolution but reduce maximum lux range (down to 819.2 lux at 640 ms)
  • I2C Interface – Simple two-wire communication
  • STEMMA QT / Qwiic Connectors – Two connectors for solderless plug-and-play wiring
  • 3.3V and 5V Compatible – Built-in voltage regulator and level shifting

Ideal For

  • Gesture and proximity detection
  • Automatic display brightness adjustment
  • Object detection at short range
  • Ambient light monitoring for IoT and environmental sensing

Package Contents

  • 1× Adafruit VCNL4040 Proximity and Lux Sensor Breakout
Note: STEMMA QT cable not included. Increasing the integration time improves sensitivity but reduces the maximum measurable lux — choose a setting appropriate for your lighting conditions.

Resources

$11.60
Adafruit VCNL4040 Proximity and Lux Sensor - STEMMA QT—
$11.60

Product Information

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Description

The Adafruit VCNL4040 is a two-in-one proximity and ambient light sensor from Vishay. It measures proximity from 0 to 200 mm (~7.5 inches) using an on-board IR LED, and ambient light from 0.0125 to 6,553 lux — all over a simple I2C interface.

The breakout includes 3.3V and 5V level-shifting circuitry for compatibility with both Feather/Raspberry Pi (3.3V) and Arduino/Metro (5V) platforms. Two STEMMA QT / Qwiic connectors provide solderless I2C connection and easy daisy-chaining with other sensors.

Key Features

  • Proximity Sensor – 0 to 200 mm range with adjustable IR LED current and duty cycle
  • Ambient Light Sensor – 0.0125 to 6,553 lux (at 80 ms integration time)
  • Adjustable Integration Time – 80 ms to 640 ms; longer times increase sensitivity and resolution but reduce maximum lux range (down to 819.2 lux at 640 ms)
  • I2C Interface – Simple two-wire communication
  • STEMMA QT / Qwiic Connectors – Two connectors for solderless plug-and-play wiring
  • 3.3V and 5V Compatible – Built-in voltage regulator and level shifting

Ideal For

  • Gesture and proximity detection
  • Automatic display brightness adjustment
  • Object detection at short range
  • Ambient light monitoring for IoT and environmental sensing

Package Contents

  • 1× Adafruit VCNL4040 Proximity and Lux Sensor Breakout
Note: STEMMA QT cable not included. Increasing the integration time improves sensitivity but reduces the maximum measurable lux — choose a setting appropriate for your lighting conditions.

Resources