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 |
|---|---|---|
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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.