This project uses an Arduino Nono with a bedside located illuminated button to control a WS2811/WS2812 LED strip for my little daugther's Night Light.

Sounds like an overkill? No - this has the following advantages:

• Automatic turn off after programmable time - the light is not on for the whole night.
• Fade out to show that light will turn off soon - so stay close to the button if re-enabling light is desired.

The images below show the main parts of the system.

Button Mounted	Top View of Circuit	Side View of circuit

The following circuit was drawn with Fritzing and is located in img/drawing.fzz folder.

The transistor used in this example is a BD645. But any transistor capable for the current drawn by the LED strip could be used. The capacitor with 470uF buffers the energy for the LED strip. This way the supply voltage should be stable even with long supply leads.

Item	Supplier - Partnumber	Image	Details
Arduino Nano	Ebay - Arduino Nano V3.0 (ATmega328)		Datasheet
Button	Ebay - "LED Drucktaster Gelb Druckknopf Taster Schalter Push Button 19mm"		Datasheet
LED Stip	Ebay - "5m adressierbar WS2812B ws2811 IC 5050 144 RGB LED 5V Streifen"		Datasheet

The project can be compiled by using the Arduino App or by using CLion. This is why the project folder contains all the CMake files.

For controlling the LEDs, the Adafruit NeoPixel library is used. But you do not have to install it, as it is located in the src/ directory.