You want to get notified when someone enters your room?
You want to know how many visitors you had?
You want a device that says “Goodbye” everytime someone leaves?
In this instructable i will explain how to do this using a Raspberry Pi and a photoelectric barrier unsing laser sensors.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!