How to Blink Multiple Leds with Arduino Uno 

We have already discussed the method to blink a single LED. In this project, we will discuss the process to blink three LEDs using for loop. The three LEDs will light up one after the other.Let's start the process. Hardware Required The components required for the project are listed below: - 3 x red LED - 3 x 560 Ohm Resistors - Arduino UNO board - Jumper wires - Electronic practical bread board - We can use any color LED as per our choice. Principle We will connect the three LEDs to pins 13, 12, and 11 of the Arduino board. The limiting value of resistance should be between 470 and 750 ohms to set the optimal current through the LEDs. The required resistance is enough to light up an LED without damaging the board and the LED. We will turn the LED ON/OFF individually. Procedure The connection of the above project is discussed below: - Connect the resistor of 560 Ohm in series with the three LEDs. Now connect it to the pin number 13, 12, and 11 of the Arduino board. - Connect the negative terminal of the three LEDs to the GND (Ground).