In this chapter, we learned how to use PWM to set the color of an RGB LED and that a standalone single RGB LED requires three dedicated GPIO pins to work—one for each of the colors, red, green, and blue. We then explored another type of RGB LED, the APA102, which is a 2-wire SPI controllable device that can be chained together to create LED lighting strips. Next, we learned how to use an OLED display by creating an example application that displayed your Raspberry Pi's CPU temperature. We concluded with an example of using PWM together with a passive buzzer to make sound by parsing an RTTTL music score.
What you have learned in this chapter will allow you to add visual and auditable feedback to your own projects. You will also be able to extend your learning to other types of displays with relative ease, as the Luma library we have used is capable of working with a range of other display types and models in addition to the APA102 LED strip and SSD1306 ...
