Chapter 14. Displays
14.0 Introduction
Although the Raspberry Pi can use a monitor or TV as a display, it is often nice to use a smaller, more specialized display with it. In this chapter, we explore a range of different displays that can be attached to a Raspberry Pi.
Some of the recipes require the use of a solderless breadboard and male-to-female jumper wires (see Recipe 9.8).
14.1 Using a Four-Digit LED Display
Note
Be sure to check out the accompanying video for this recipe at http://razzpisampler.oreilly.com.
Problem
You want to display a four-digit number in an old-fashioned, seven-segment LED display.
Solution
Attach an Inter-Integrated Circuit (I2C) LED module, such as the model shown in Figure 14-1, to a Raspberry Pi using female-to-female jumper wires.
To make this recipe, you will need the following:
-
Four female-to-female jumper wires (see âPrototyping Equipment and Kitsâ)
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Adafruit 4Ã7-segment LED with I2C backpack (see âModulesâ)
The connections between the Raspberry Pi and the module are as follows:
VCC (+) on the display to 5V on the Raspberry Pi general-purpose input/output (GPIO) connector
GND (-) on the display to GND on the Raspberry Pi GPIO connector
SDA (D) on the display to GPIO 2 (SDA) on the Raspberry Pi GPIO connector
SCL (C) on the display to GPIO 3 (SCL) on the Raspberry ...
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