{"id":4946,"date":"2015-01-18T16:37:48","date_gmt":"2015-01-18T16:37:48","guid":{"rendered":"http:\/\/randomnerdtutorials.com\/?p=4946"},"modified":"2019-04-02T10:23:36","modified_gmt":"2019-04-02T10:23:36","slug":"modifying-cheap-pir-motion-sensor-to-work-at-3-3v","status":"publish","type":"post","link":"https:\/\/randomnerdtutorials.com\/modifying-cheap-pir-motion-sensor-to-work-at-3-3v\/","title":{"rendered":"Modifying Cheap PIR Motion Sensor to Work at 3.3V"},"content":{"rendered":"

This\u00a0PIR motion sensor<\/a>\u00a0is a $2 sensor that\u00a0is used to detect movement from humans or pets.\u00a0You can read my previous tutorial on how to use this sensor with an Arduino<\/a>.<\/p>\n

\"\"<\/p>\n

I’m currently working on a new project and I needed to make this module operate\u00a0at 3.3V. By default this module runs at\u00a05V, but it has an on board voltage regulator that drops that voltage to 3.3V. \u00a0With a quick online search I’ve found a\u00a0blog post<\/a>\u00a0that\u00a0explains how you can bypass the voltage regulator and use this module at 3.3V, which is exactly what I needed.<\/p>\n

Where to buy one?<\/h2>\n

You can click here<\/a> to compare the PIR motion sensor (HC-SR501) at different stores and find the best price.<\/p>\n

Before soldering<\/h2>\n

Some of these modules\u00a0come with pins soldered in that top right corner, so you don’t have to solder anything. You would simply connect a jumper wire\u00a0to that\u00a0pin that is highlighted in red (see Figure below). With my particular sensor\u00a0I had to solder a small wire.<\/p>\n

\"pir_motion_sensor_arduino\"<\/a><\/p>\n

After soldering<\/h2>\n

Here’s how it looks, now if you supply\u00a03.3V through that red wire\u00a0your module\u00a0works at 3.3V.<\/p>\n

\"pir_motion_sensor_arduino_3.3V\"<\/a><\/p>\n

Testing<\/h2>\n

I’ve tested this sensor\u00a0with an Arduino using this code<\/a>. The only difference between that previous blog post is that now I can power my\u00a0module with the\u00a03.3V pin of the Arduino!<\/p>\n

Do you have any questions?\u00a0Leave a comment down below!<\/h4>\n

Thanks for reading. If you like this post probably you might like my next ones, so please support me by subscribing my blog and my\u00a0Facebook Page.<\/p>\n","protected":false},"excerpt":{"rendered":"

This\u00a0PIR motion sensor\u00a0is a $2 sensor that\u00a0is used to detect movement from humans or pets.\u00a0You can read my previous tutorial on how to use this sensor with an Arduino.<\/p>\n","protected":false},"author":1,"featured_media":4948,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[305,2,256,269,264,215,10],"tags":[],"class_list":["post-4946","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-0-other","category-arduino","category-electronics","category-guide-project","category-project","category-sensors","category-a-tutorials"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2015\/01\/pir_motion_sensor_arduino_3.3V.jpg?fit=600%2C398&quality=100&strip=all&ssl=1","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/posts\/4946","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/comments?post=4946"}],"version-history":[{"count":0,"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/posts\/4946\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/media\/4948"}],"wp:attachment":[{"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/media?parent=4946"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/categories?post=4946"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/randomnerdtutorials.com\/wp-json\/wp\/v2\/tags?post=4946"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}