![Adafruit ALS-PT19 Analog Light Sensor Breakout [ADA2748]](https://cdn11.bigcommerce.com/s-t8bvbs505h/images/stencil/1280x1280/products/1698645/1771212/61DzojArL-L__61794.1558153086.jpg?c=2 "Adafruit ALS-PT19 Analog Light Sensor Breakout [ADA2748]")
![Adafruit ALS-PT19 Analog Light Sensor Breakout [ADA2748]](https://cdn11.bigcommerce.com/s-t8bvbs505h/images/stencil/500x659/products/1698645/1771212/61DzojArL-L__61794.1558153086.jpg?c=2 "Adafruit ALS-PT19 Analog Light Sensor Breakout [ADA2748]")
Add a teeny analog light sensor, the ALS PT19 analog light sensor is a great way to upgrade a project that uses a photocell and needs RoHS compliance. Due to the high rejection ratio of infrared radiation, the spectral response of the ambient light sensor is close to that of human eyes.
It's a pretty simple sensor - connect - to ground, + to 2.5V-5.5V or so to power it. Now measure the analog voltage on the OUT pin. That's it! The voltage will increase when the sensor detects more light.
![Adafruit TSL2561 Digital Luminosity/Lux/Light Sensor Breakout [ADA439]](https://cdn11.bigcommerce.com/s-t8bvbs505h/images/stencil/500x659/products/1443494/1495389/51dJ8EazDAL__24745.1557953201.jpg?c=2 "Adafruit TSL2561 Digital Luminosity/Lux/Light Sensor Breakout [ADA439]")
![Adafruit GA1A12S202 Log-Scale Analog Light Sensor [ADA1384]](https://cdn11.bigcommerce.com/s-t8bvbs505h/images/stencil/500x659/products/1709300/1782062/41f7HNw6-IL__06889.1558157045.jpg?c=2 "Adafruit GA1A12S202 Log-Scale Analog Light Sensor [ADA1384]")