The Darkness Map
encompasses both data collection and visualization of nighttime light levels. You can add to the map by downloading the app for iPhone or Android, but you can also contribute data by creating your own data collection device. This tutorial will cover how to build an Arduino powered data logger with a light intensity sensor. Since the sensor modules are attached to the Arduino on a breadboard, it's fairly simple to swap out the light sensor for a different sensor of your choosing. You can use the device to log data about temperature, air quality, noise, and many other environmental factors, and because everything is attached by breadboard, you can easily adapt it to use in other projects.