I started with connecting a yellow wire between pin 13 and breadboard. After putting the resistor labeled red, red, brown and gold, I carefully put LEDs with its short leg going to ground. I used parallel connection to put two LEDs and their blinking looked slightly weaker than the case I put only one LED. By connecting a different color wire to ground, I completed the circuit. Then, at Arduino environment, I changed the code controlling speed of blinking LED.
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