External LED Experiments

After completing the External LED project, test yourself by trying these experiments.

On the Arduino board, you can use any of the digital pins from 2 to 13.

1 Connect the external LED to pin 5 instead of pin 3. Modify the code so that it will control the LED on pin 5 to turn on for 1 second and off for 1 second.

Notice that there are three places in the code where the number 3 has to be changed to the number 5. 		External LED
2 Instead of putting the number 5 in these three places, you can create a variable name called led and assign the value 5 to it.
The int keyword declares an integer variable, followed by an identifier name. The = sign is used to assign a value to the variable.

Now you just use the variable led instead of the number 5 in the pinMode and digitalWrite commands. 		External LED
3 Assign the number 13 to the led variable. What happens when you run the program?

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