1. Place three LEDs on the breadboard.
2. Connect each LED through a 220Ω resistor.
3. Connect LED 1 to pin 8.
4. Connect LED 2 to pin 9.
5. Connect LED 3 to pin 10.
6. Connect all grounds to Arduino GND.
7. Upload the code using Arduino IDE.
8. The LEDs should blink one after another.
Arduino 3 LED Blinking Project
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