{"id":2543,"date":"2017-06-05T16:40:22","date_gmt":"2017-06-05T15:40:22","guid":{"rendered":"http:\/\/www.robertprice.co.uk\/robblog\/?p=2543"},"modified":"2017-06-05T16:40:22","modified_gmt":"2017-06-05T15:40:22","slug":"using-motion-sensor-raspberry-pi-php","status":"publish","type":"post","link":"https:\/\/www.robertprice.co.uk\/robblog\/using-motion-sensor-raspberry-pi-php\/","title":{"rendered":"Using a motion sensor on a Raspberry Pi with PHP"},"content":{"rendered":"

Adding a motion sensor to a Raspberry Pi is easy. In this article I’ll show you how to use it with PHP.<\/p>\n

The HC-SR501<\/a> is a pyroelectric infrared PIR motion sensor module, that connects to the Raspberry Pi using just 3 wires.<\/p>\n

Connect GND to GND on the Pi, VCC to +5V on the Pi, and OUT to GPIO 17 on the Pi. That’s all that’s needed.<\/p>\n

\"Added<\/p>\n

To use the sensor with PHP we use the PHPi<\/a> library. This library supports event driven bindings for the Raspberry Pi GPIO. We install this using Composer<\/a>.<\/p>\n

\r\ncomposer require calcinai\/phpi\r\n<\/pre>\n
To use the PHPi library we need to bring it in using the autoloader, and add some namespace shortcuts.<\/p>\n
\r\nrequire 'vendor\/autoload.php';\r\n\r\nuse Calcinai\\PHPi\\Pin;\r\nuse Calcinai\\PHPi\\Pin\\PinFunction;\r\n<\/pre>\n
We then create a board<\/p>\n
\r\n$board = \\Calcinai\\PHPi\\Factory::create();\r\n<\/pre>\n
We now need to declare that we’re using GPIO pin 17 for input.<\/p>\n
\r\n$pin = $board->getPin(17)\r\n             ->setFunction(PinFunction::INPUT)\r\n             ->setPull(Pin::PULL_UP);\r\n<\/pre>\n
As this is event driven programming, we need to listen to the pin to see when it changes. When the pin goes high, we know motion has been detected and we can do something. In this example, we’ll just write a message to the screen.<\/p>\n
\r\n$pin->on('level.high', function() {\r\n        echo \"Motion detected\\n\";\r\n});\r\n<\/pre>\n
Finally we start the start the loop running, so the script is listening and reacting to events.<\/p>\n
\r\n$board->getLoop()->run();\r\n<\/pre>\n
Putting it all together<\/p>\n
Here’s the final working PHP to detect motion using the HC-SR501<\/p>\n
\r\n<?php\r\n\r\nrequire 'vendor\/autoload.php';\r\n\r\nuse Calcinai\\PHPi\\Pin;\r\nuse Calcinai\\PHPi\\Pin\\PinFunction;\r\n\r\n$board = \\Calcinai\\PHPi\\Factory::create();\r\n\r\n$pin = $board->getPin(17) \/\/BCM pin number\r\n             ->setFunction(PinFunction::INPUT)\r\n             ->setPull(Pin::PULL_UP);\r\n\r\n$pin->on('level.high', function() {\r\n        echo \"Motion detected\\n\";\r\n});\r\n\r\n$board->getLoop()->run();\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"
Adding a motion sensor to a Raspberry Pi is easy. In this article I’ll show you how to use it with PHP. The HC-SR501 is a pyroelectric infrared PIR motion sensor module, that connects to the Raspberry Pi using just 3 wires. Connect GND to GND on the Pi, VCC to +5V on the Pi, … Continue reading “Using a motion sensor on a Raspberry Pi with PHP”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":2546,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[84],"tags":[87,50,85,88],"class_list":["post-2543","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hardware","tag-gpio","tag-php","tag-raspberry-pi","tag-sensors"],"yoast_head":"\nUsing a motion sensor on a Raspberry Pi with PHP - Robert Price<\/title>\n<meta name=\"description\" content=\"A working example showing to wire and use a HC-SR501 PIR motion sensor to a Raspberry Pi, and how to detect motion using PHP.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.robertprice.co.uk\/robblog\/using-motion-sensor-raspberry-pi-php\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Using a motion sensor on a Raspberry Pi with PHP - 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