Adafruit TSL2591 High Dynamic Range Digital Light Sensor

When the future is dazzlingly bright, this ultra-high-range luminosity sensor will help you measure it. The TSL2591 luminosity sensor is an advanced digital light sensor, ideal for use in a wide range of light situations.

Compared to low-cost CdS cells, this sensor is more precise, allowing for exact lux calculations. It can be configured for different gain/timing ranges to detect light from 188 uLux up to 88,000 Lux on the fly. It features both infrared and full spectrum diodes, enabling separate measurements of infrared, full-spectrum, or human-visible light. This offers a more accurate representation of what human eyes perceive compared to sensors that capture only one type of light.

This sensor resembles the TSL2561 but with an extended range and different interface code, plus a massive 600,000,000:1 dynamic range. Keep in mind the I2C address can't be changed. The built-in ADC allows compatibility with any microcontroller, even those without analog inputs. Its low current draw makes it perfect for low-power data logging, drawing about 0.4mA when actively sensing and less than 5 uA in power-down mode.

Additionally, SparkFun qwiic compatible STEMMA QT connectors for the I2C bus eliminate the need for soldering. Simply connect to your favorite microcontroller with a plug-and-play cable for immediate data retrieval. The STEMMA QT connectors also enable use with various associated accessories. Note that the QT Cable is not included but is available separately.

A detailed tutorial is provided to guide you through wiring the sensor and using it with an Arduino, complete with example code for obtaining readings and calculating lux.