20.1: Introduction

Embedded Controllers Using C and Arduino · LibreTexts

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    From LibreTexts, under CC BY-NC-SA 4.0, as the source states it; its equations are written in TeX, which the PDF shows typeset. This page at LibreTexts.

    In this chapter we shall investigate the basic digital input circuitry. This can be used to sense the state of external switches and other two-state devices. These devices can be active, that is, generating a high or low voltage, or they can be simple passive switches connecting to ground through the use of an optional internal pull-up resistor. A simplified diagram of the General Purpose Input-Output (GPIO) circuitry can be seen in Figure \(\PageIndex{1}\). As in the previous chapter, this is for a single bit. Once again, we shall remove sections that are not pertinent to the input function or for enhanced clarity.

    GPIO circuitry (from Atmel 2014).
    Figure \(\PageIndex{1}\): GPIO circuitry (from Atmel 2014).

    This page titled 20.1: Introduction was last modified on Wed, 08 Sep 2021 02:57:35 GMT and is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by James M. Fiore via source content that was edited to the style and standards of the LibreTexts platform.