Adafruit LTR-303 Light Sensor - STEMMA QT / Qwiic

The Adafruit LTR-303 Light Sensor is a simple and popular low-cost I2C digital light sensor that provides reliable and wide-ranging light measurements. Ideal for projects requiring detection of ambient light to adjust device brightness, robotic navigation, or day/night detection.

This sensor measures both Infrared and Visible+IR spectrums with 16-bit resolution, allowing calculations of human-visible light by subtracting the values. It supports configurable gain and integration time settings, measuring from 0 to 65,000+ lux.

Equipped with alert and IRQ capabilities, the LTR-303 can trigger pins above or below threshold values, aiding ultra-low power applications. Packaged on a STEMMA QT form factor PCB, it includes a voltage regulator and level shifting for compatibility with 3.3V and 5V devices.

The sensor provides I2C connectivity with STEMMA QT / Qwiic connectors, enabling solderless plug-and-play use with compatible cables. It is supported by CircuitPython and Arduino libraries for easy integration.

• I2C interface up to 400kbit/s, address 0x29
• Small ChipLED package with temperature compensation
• Low power consumption with standby mode
• Operating temperature: -30°C to +70°C
• RoHS and Halogen free compliant
• Human eye spectral response with immunity to IR/UV light
• Rejects 50/60 Hz lighting flicker automatically
• Dynamic range: 0.01 lux to 64k lux
• 16-bit resolution
• Interrupt output capability
• Product dimensions: 25.3mm x 17.7mm x 4.8mm
• Weight: 1.9g

Comes with STEMMA QT / Qwiic connectors for easy wiring. QT cable not included.

Learn more and access libraries and guides at the primary guide.