{"id":130655,"date":"2014-07-19T12:06:26","date_gmt":"2014-07-19T12:06:26","guid":{"rendered":"https:\/\/randomnerdtutorials.com\/?p=130655"},"modified":"2024-09-09T20:35:20","modified_gmt":"2024-09-09T20:35:20","slug":"raspberry-pi-detect-motion-pir-python","status":"publish","type":"post","link":"https:\/\/randomnerdtutorials.com\/raspberry-pi-detect-motion-pir-python\/","title":{"rendered":"Raspberry Pi: Detect Motion using a PIR Sensor with Python"},"content":{"rendered":"\n

Learn how to use a PIR motion sensor with the Raspberry Pi to detect motion. We’ll show you how to wire the sensor to the Raspberry Pi GPIOs and write a Python script that does a certain task when it detects motion. To write the Python script, 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 PIR Motion Sensor<\/a><\/li>\n\n\n\n
  2. Wiring a PIR Motion Sensor to the Raspberry Pi<\/a><\/li>\n\n\n\n
  3. Detect Motion with the Raspberry Pi using gpiozero<\/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\n\n\n
    3. Know how to use the Raspberry Pi GPIOs so that you know how to wire the circuit properly. Read the following tutorial: Raspberry Pi Pinout Guide: How to use the Raspberry Pi GPIOs?<\/strong><\/a><\/li>\n<\/ol>\n\n\n\n

      Introducing the PIR Motion Sensor<\/h2>\n\n\n\n

      A PIR motion sensor detects changes in infrared light in its field of view. This makes it ideal for detecting humans or animals because it will pick up living things (or heat-emitting objects) that move within its range but not inanimate objects. <\/p>\n\n\n\n

      You can program the Pi to react to changes in infrared light by triggering an event such as turning on a light, sounding an alarm, sending a notification<\/a>, or, as we\u2019ll do in this project, simply printing a message in the shell.<\/p>\n\n\n

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      \"AM312<\/figure><\/div>\n\n\n

      The PIR motion sensor outputs a HIGH <\/strong>signal on the Data pin when it detects movement, or a LOW <\/strong>signal if it doesn’t. It only has three pins: VCC<\/strong>, GND, <\/strong>and Data<\/strong>.<\/p>\n\n\n\n

      Wiring a PIR Motion Sensor to the Raspberry Pi<\/h2>\n\n\n\n

      The PIR motion sensor has three pins: VCC, GND, and Data. You should connect VCC to the 3V3 pin, GND to a GND pin, and the Data pin to a suitable Raspberry Pi GPIO\u2014we’ll connect it to GPIO 18 (take a look at the Raspberry Pi pinout<\/a>).<\/p>\n\n\n\n

      PIR Motion Sensor<\/strong><\/td>Raspberry Pi<\/strong><\/td><\/tr>
      Vin\/3v3<\/strong><\/td>3.3V<\/td><\/tr>
      Data<\/strong><\/td>GPIO 18 (or another GPIO of your choice)<\/td><\/tr>
      GND<\/strong><\/td>GND<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

      We’ll use the AM312 Mini PIR Motion<\/a> sensor because it works with 3V3 volts, which is perfect for the Raspberry Pi.<\/p>\n\n\n\n

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