The loop function runs as long as the Arduino board is powered and will blink the LED ON and OFF withe 1 second pause between states. You can use another pin, for example pin 12 and then change the ...

Blink One of the initial Arduino tutorials is Blink, a program that simply turns an LED on and off for one second each. It is a nice demo that doesn't require any external devices and can be written ...

🧠 Working Principle The Arduino sketch (code) sends a HIGH signal to pin 13 for a short period (e.g., 1 second), lighting up the LED. Then it sends a LOW signal, turning the LED off. This cycle ...

Your Arduino is blinking away and you already understand why from the perspective of the source code and the physical circuit. You’re now on your way to more physical computing!

You could put the Arduino in deep sleep, if you wanted to and that LED will still blink. With a little work, you could probably adapt this idea to any number of circuits out of the 555 playbook ...

Click Sketch > Verify / Compile to make sure the code is properly in there. Save the file and then attach the Arduino to your computer with the USB cable. Click File > Upload.