{"title":"Adafruit LTR-329 Light Sensor  - STEMMA QT / Qwiic","handle":"adafruit-ltr-329-light-sensor-stemma-qt-qwiic","url":"/products/adafruit-ltr-329-light-sensor-stemma-qt-qwiic","description":"The Adafruit LTR-329 is a low-cost I2C digital light sensor that provides 16-bit measurements for both infrared and visible+IR spectrums. Subtract one from the other to get human-visible light readings. With configurable gain and integration time, it can measure from 0 to over 65,000 lux — suitable for everything from dim indoor lighting to bright sunlight.\n\nThis is the simpler, lower-cost sibling of the LTR-303 — same core light sensing capability but without the interrupt/alert feature. This STEMMA QT breakout includes voltage regulation and level shifting for both 3.3 V and 5 V systems.\n\nKey Features\n\n\nDual-Spectrum Sensing – 16-bit measurements for both infrared and visible+IR light\n\nWide Lux Range – 0 to 65,000+ lux with configurable gain and integration time\n\nI2C Interface – Simple two-wire communication\n\nSTEMMA QT / Qwiic – Solderless I2C connectors for easy plug-and-play wiring\n\n3.3 V and 5 V Compatible – Onboard voltage regulator and level shifting\n\nArduino & CircuitPython Libraries – Ready-to-use drivers with example code\n\n\nIdeal For\n\nAutomatic display brightness adjustment\nDay/night detection and light-based automation\nLight-following robots and solar trackers\nEnvironmental monitoring and data logging\n\n\nPackage Contents\n\n1× Adafruit LTR-329 Light Sensor Breakout (STEMMA QT)\n\n\n\nTip: If you need interrupt/alert capabilities for threshold-based triggering, consider the LTR-303 instead — same sensor with added IRQ output.\n\n\nResources\n\nLTR-329 Arduino Library (GitHub)\nLTR-329 CircuitPython Library (GitHub)\nWhat is STEMMA QT?\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":1881,"title":"Default Title","sku":"AF-5591","price":9.15,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}