https://www.instructables.com/Spooky-Fading-LED-Eyes/
Spooky Fading LED Eyes : 5 Steps (with Pictures) - Instructables
Spooky Fading LED Eyes: Using a microcontroller, like an Arduino, to fade an LED is not always the best option. Sometimes, you want a simple, low powered...
fading led5 stepsspookyeyespictures