Header Strips, LEDs, and Reset
In this chapter, an inventory of the Raspberry Pi header strips, LEDs, and reset button connections is covered. These are important interfaces from the Pi to the outside world. You may want to use a bookmark for Table 3-3, which outlines the general purpose input/output (GPIO) pins on header strip P1.
The Model A Raspberry Pi has a subset of the Model B LED indicators because it lacks the Ethernet port. The Model B has three additional LEDs, each showing the network status. Table 3-1 provides a list of LED statuses.
Table 3-1. Status LEDs
OK or ACT LED
This green LED indicates SD card I/O ...