For this project you will need:
1-12 leds (im using 10)
Step 2: Inserting leds
Take your leds and put them in a row on the breadboard. Make sure you know which side of the led is positive and which side is negative. I like to point the positive side of the led towards the right. Also, keep a one hole spacing in between each led
Now, plug in a medium sized wire into the first hole on the negative row on the top of the breadboard.
Now insert wires in front of every positive side of each led.
Now insert wires in the negative row that you put the medium wire in. now plug those wires into the negative sides of the leds.
Now we have to plug the wires in. Position the arduino board so that you can plug the wires in from arduino pin 1 to arduino pin 12 but it doesnt matter what pin you go up to.