O'Reilly logo

Raspberry Pi Hardware Reference by Warren W. Gay

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

CHAPTER 10

image

GPIO

General-purpose I/O is a topic near to the hearts of Raspberry Pi owners, because this is the interface to the outside world. The BCM2835 is flexibly designed to allow I/O pins to be reconfigured under software control. GPIO 14 can be an input, an output, or operate as a serial port TX data line, for example. This makes the Raspberry Pi very adaptable.

One of the challenges related to the Pi’s GPIO interface is that it uses a weak CMOS 3 V interface. The GPIO pins are susceptible to static electricity damage, and the I/O pins are weak drivers (2 to 16 mA). Additionally, GPIO power must be budgeted from the total spare current ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required