Page 213 - Make Your Own PCBs with EAGLE from Schematic Designs to Finished Boards

CHAPTER 9

A Raspberry Pi Expansion Board

I n this chapter, we will look in detail at another of the author’s open-source hardware (OSH)

projects, specifically, version two of the RaspiRobot board (www.raspirobot.com). This board
(Figure 9-1) is designed to allow a Raspberry Pi single-board computer to be powered by batteries

and also to control two direct-current (dc) motors. The board has a number of interfaces including to
an HC-SR-04 ultrasonic range finder, a 5V I2C interface designed to easily accommodate displays
and other I2C devices, and a pair of open-collector outputs.

FIGURE 9-1 The RaspiRobot board version 2.