If you work or go to school in an environment where people share a common space, leaving some sort of message outside of the door may be necessary when you’d like to be left undisturbed. For this purpose, Redditor “emnc91” came up with an Arduino-based messaging system, attached to the wall outside of the “Gillan Lab” inside of nicely laser-cut enclosure.
The device has a toggle switch that enables LEDs to indicate “experiment in progress” or “clear,” and there is an LCD display below for more information. This screen is updated via Bluetooth, and a backlight goes on when someone approaches via a sonar sensor.
Finally, there’s a doorbell function that flashes a light and can also beep, allowing one to signal the occupants inside without disturbing an ongoing experiment.[h/t: Reddit]
Tell Others to Stay Away With Your Own Lab Messaging System was originally published in Hackster’s Blog on Medium, where people are continuing the conversation by highlighting and responding to this story.