Getting Started With Raspberry Pi, 4th Edition

Figure 7-1.

Using a text editor and LXTerminal to edit and launch

Python scripts.

Try modifying the script to make the LED blink faster by using dec-

imals in the time.sleep() functions. You can also try adding a few

more LEDs and getting them to blink in a pattern. You can use any

of the dedicated GPIO pins that are shown in Figure 6-2.

Reading a Button

If you want something to happen when you press a button, one way

to do that is to use a technique called

polling

. Polling means contin-

ually checking over and over again for some condition. In this case,

your program will be polling whether the button is connecting the

input pin to 3.3V or to gr ...