1.3 Circuit Connection

To make this Multiple Led blinking project, first we will make the circuit connection of all the LEDs with Arduino Uno 

1.Collect all the components required:

           *Arduino Uno

           *Led x4

           *USB A to B cable

           *Jumper wires

           *Breadboard

           *Resistors x 4

2.  Now, Place all the 5 LEDs on the breadboard. As you are aware Led have two pins:

*Anode (Longer leg)

*Cathode (Shorter leg).

3. Connect the anodes of the LEDs with the digital I/O pins  2, 3, 4, 5,  and 6 from the Arduino UNO through the current-limiting series resistor. 

4. Connect all the cathode of the LEDs together and then connect to the ground(negative) row of the breadboard. The ground pin of breadboard to he ground pin of Arduino UNO.

Refer the below image: