Introduction In this project we will see how to do a blinking Christmas tree with leds and an Arduino card. This decoration will be a good idea to decor your house during christmas. Difficulty Necessary equipment Necessary equipment to realize the project:An Arduino card1 yellow led (for the stars)7 red leds5 green leds6 resistors 220 ohms Project scheme What are resistors useful for? The resistors are used to reduce the current in the leds. These protects your leds from burning out. To calculate the value of the resistor you need you can read our course about it. How to make the structure of your christmas tree? To make the structure of your christmas tree, you can use cardboard cut shaped as a christmas tree and glue the leds. The cardboard gives a wood effect to your christmas tree. You can also make the structure with a 3d printer in a brown color to reproduce the wood effect. Project Program How to upload the program into the Arduino card? To do that you will need Arduino ide software. You juste have to copy the program above into arduino ide and the software will upload the program for you. Modify the program The program that we realized blink the leds at 1 second with different colors. You can change the delay to blink quicker or slower the leds. Project simulation Here is the project simulation on tinkercad: