Each of the following connections provides additional interfaces for Raspberry Pi:
- 20 x 2 GPIO pin header (Model A+, B+, 2 B, 3 B, and Pi Zero): This is the main 40-pin GPIO header of Raspberry Pi used for interfacing directly with hardware components. We use this connection in Chapters 6, Detecting Edges and Contours in Images, Chapter 7, Creating 3D Graphics, Chapter 9, Using Python to Drive Hardware, and Chapter 10, Sensing and Displaying Real-world Data. The recipes in this book are also compatible with older models of Raspberry Pi that have a 13 x 2 GPIO pin header.
- P5 8 x 2 GPIO pin header (Model 1 B revision 2.0 only): We do not use this in the book.
- Reset connection: This is present on later models ...