{"id":129551,"date":"2023-06-15T12:46:16","date_gmt":"2023-06-15T12:46:16","guid":{"rendered":"https:\/\/randomnerdtutorials.com\/?p=129551"},"modified":"2023-07-19T11:03:35","modified_gmt":"2023-07-19T11:03:35","slug":"raspberry-pi-digital-inputs-python","status":"publish","type":"post","link":"https:\/\/randomnerdtutorials.com\/raspberry-pi-digital-inputs-python\/","title":{"rendered":"Raspberry Pi: Read Digital Inputs with Python (Buttons and Other Peripherals)"},"content":{"rendered":"\n

In this guide, you’ll learn how to set the Raspberry Pi GPIOs as digital inputs and how to read their state using a Python program. As an example, we’ll read the state of a pushbutton (pressed or not pressed), but the example can be applied to any other peripherals that output digital signals. We’ll use the gpiozero<\/span> interface.<\/p>\n\n\n

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\"Raspberry<\/figure><\/div>\n\n\n

Table of Contents<\/h2>\n\n\n\n

Throughout this tutorial, we’ll cover the following main topics:<\/p>\n\n\n\n

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  1. Introducing the Raspberry Pi GPIOs<\/a><\/li>\n\n\n\n
  2. Wire a Pushbutton to the Raspberry Pi<\/a><\/li>\n\n\n\n
  3. Reading Raspberry Pi Digital Inputs (Pushbutton)<\/a><\/li>\n\n\n\n
  4. Reading Raspberry Pi Digital Inputs (Generic Digital Inputs)<\/a><\/li>\n<\/ol>\n\n\n\n

    Prerequisites<\/h2>\n\n\n\n

    Before continuing with this tutorial, check the following prerequisites.<\/p>\n\n\n\n

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    1. Get familiar with the Raspberry Pi board\u2014if you’re not familiar with the Raspberry Pi, you can read our Raspberry Pi Getting Started Guide here<\/strong>.<\/a><\/li>\n\n\n\n
    2. You must know how to run and create Python files on your Raspberry Pi. We like to program our Raspberry Pi via SSH using an extension on VS Code. We have a detailed tutorial about that subject: Programming Raspberry Pi Remotely using VS Code (Remote-SSH)<\/strong><\/a>.<\/li>\n<\/ol>\n\n\n\n

      Introducing the Raspberry Pi GPIOs<\/h2>\n\n\n\n

      GPIO stands for General Purpose Input Output<\/em> pins and those allow you to connect and control electronic hardware, like LEDs, motors, and sensors to your Raspberry Pi.<\/p>\n\n\n\n

      This means they can be used to both read and send information, allowing your Pi to interact
      with the outside world.<\/p>\n\n\n\n

      Most models of Raspberry Pi boards have a double row of 40 GPIO pins. The layout of the pins is usually the same for most Raspberry Pi models.<\/p>\n\n\n\n

      In this tutorial, we’ll take a look at how we can set the Raspberry Pi GPIOs as outputs to control an LED or any other actuator that can be controlled with high (3V3) and low (0V) signals.<\/p>\n\n\n\n

      Raspberry Pi GPIO Numbering<\/h3>\n\n\n\n

      There are two different ways to refer to a GPIO pin: its name (which is known as GPIO numbering or Broadcom numbering) or its corresponding pin physical number (which corresponds to the pin’s physical location on the header). <\/p>\n\n\n\n

      For example, GPIO 25 corresponds to pin 22 (see the picture below). Throughout this tutorial, we’ll refer to GPIO pins by their GPIO numbering (Broadcom numbering).<\/p>\n\n\n

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      \"Raspberry<\/figure><\/div>\n\n\n

      To learn more about the Raspberry Pi GPIOs, check the following guide: Raspberry Pi Pinout Guide: How to use the Raspberry Pi GPIOs?<\/a><\/p>\n\n\n\n

      Wiring the Circuit<\/h2>\n\n\n\n

      Wire a pushbutton and an LED to the Raspberry Pi GPIOs. We’ll connect one LED to GPIO 14<\/span> (pin 8) and the pushbutton to GPIO 4<\/span> (pin7). You can use any other pins, except GPIO 0 and GPIO 1.<\/p>\n\n\n\n

      Here’s a list of components you need for this project:<\/p>\n\n\n\n