{"title":"Adafruit TSL2591 High Dynamic Range Digital Light Sensor","handle":"adafruit-tsl2591-high-dynamic-range-digital-light-sensor","url":"/products/adafruit-tsl2591-high-dynamic-range-digital-light-sensor","description":"The Adafruit TSL2591 is an ultra-high-range digital light sensor with a massive 600,000,000:1 dynamic range. It features both infrared and full-spectrum photodiodes, allowing you to separately measure infrared, full-spectrum, or human-visible light for accurate lux calculations across an enormous range from 188 µLux to 88,000 Lux.\n\nAn upgrade from the TSL2561, the TSL2591 offers a wider measurement range and configurable gain/timing settings. It communicates over I2C with a built-in ADC, so no analog pins are needed. Power consumption is extremely low — about 0.4mA when sensing and less than 5µA in power-down mode, making it ideal for battery-powered data logging.\n\nKey Features\n\n\n600,000,000:1 Dynamic Range – Exceptional range from 188 µLux to 88,000 Lux\n\nDual Photodiodes – Separate infrared and full-spectrum diodes for accurate human-visible light measurement\n\nConfigurable Gain and Timing – Adapt to different lighting conditions on the fly\n\nI2C Interface – Digital output with built-in ADC, no analog pins needed\n\nUltra-Low Power – ~0.4mA active, <5µA in power-down mode\n\nPrecise Lux Calculation – Library-supported conversion from raw readings to calibrated lux values\n\n\n\nNote: Unlike the TSL2561, the TSL2591 has a fixed I2C address — only one sensor can be used per I2C bus.\n\n\nIdeal For\n\nHigh dynamic range light measurement\nLow-power environmental data logging\nDisplay brightness auto-adjustment\nGreenhouse and agricultural light monitoring\nAstronomy and low-light sensing applications\n\n\nPackage Contents\n\n1× Adafruit TSL2591 High Dynamic Range Digital Light Sensor Breakout\n\n\nResources\n\nAdafruit TSL2591 Learning Guide (Wiring, Code & Lux Calculation)\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":13550,"title":"Default Title","sku":"AF-1980","price":14.21,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":4,"option1":"Default Title"}]}