{"id":4839,"date":"2013-06-28T09:31:37","date_gmt":"2013-06-28T09:31:37","guid":{"rendered":"http:\/\/178.62.14.192\/?p=4839"},"modified":"2013-06-28T09:31:37","modified_gmt":"2013-06-28T09:31:37","slug":"use-a-3x4-matrix-keypad-with-the-raspberrypi","status":"publish","type":"post","link":"https:\/\/www.recantha.co.uk\/blog\/?p=4839","title":{"rendered":"Use a 3&#215;4 matrix keypad with the #RaspberryPi"},"content":{"rendered":"<p>Chris Crumpacker has been experimenting with a cute 3&#215;4 matrix keypad:<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/crumpspot.blogspot.co.uk\/2013\/05\/using-3x4-matrix-keypad-with-raspberry.html\"><img src='\/blog\/wp-content\/uploads\/2013\/06\/membranekeypad34_MED1.jpg' alt='Crump Projects: Using 3x4 matrix keypad with the Raspberry Pi' \/><\/a><\/p>\n<p>He&#8217;s got it working not only with just the GPIO pins, but also with a port expander, thus saving a lot of pins. <a href=\"http:\/\/crumpspot.blogspot.co.uk\/2013\/05\/using-3x4-matrix-keypad-with-raspberry.html\">The whole blog post, including Python examples can be found here<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Chris Crumpacker has been experimenting with a cute 3&#215;4 matrix keypad: He&#8217;s got it working not only with just the GPIO pins, but also with a port expander, thus saving a lot of pins. The whole blog post, including Python&hellip;<\/p>\n<p class=\"more-link-p\"><a class=\"more-link\" href=\"https:\/\/www.recantha.co.uk\/blog\/?p=4839\">Read more &rarr;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_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":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[20,39],"tags":[],"class_list":["post-4839","post","type-post","status-publish","format-standard","hentry","category-gpio-boards","category-programming"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Use a 3x4 matrix keypad with the #RaspberryPi - Raspberry Pi Pod<\/title>\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.recantha.co.uk\/blog\/?p=4839\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Use a 3x4 matrix keypad with the #RaspberryPi - Raspberry Pi Pod\" \/>\n<meta property=\"og:description\" content=\"Chris Crumpacker has been experimenting with a cute 3&#215;4 matrix keypad: He&#8217;s got it working not only with just the GPIO pins, but also with a port expander, thus saving a lot of pins. The whole blog post, including Python&hellip;Read more &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.recantha.co.uk\/blog\/?p=4839\" \/>\n<meta property=\"og:site_name\" content=\"Raspberry Pi Pod\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/recantha\/\" \/>\n<meta property=\"article:published_time\" content=\"2013-06-28T09:31:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2013\/06\/membranekeypad34_MED1.jpg\" \/>\n<meta name=\"author\" content=\"Michael Horne\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@recantha\" \/>\n<meta name=\"twitter:site\" content=\"@recantha\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michael Horne\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.recantha.co.uk\\\/blog\\\/?p=4839#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.recantha.co.uk\\\/blog\\\/?p=4839\"},\"author\":{\"name\":\"Michael Horne\",\"@id\":\"https:\\\/\\\/www.recantha.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/c27c4ef2ee1c18b130f1fcd5dcdbb263\"},\"headline\":\"Use a 3&#215;4 matrix keypad with the #RaspberryPi\",\"datePublished\":\"2013-06-28T09:31:37+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.recantha.co.uk\\\/blog\\\/?p=4839\"},\"wordCount\":54,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\\\/\\\/www.recantha.co.uk\\\/blog\\\/#organization\"},\"articleSection\":[\"GPIO boards\",\"Programming\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.recantha.co.uk\\\/blog\\\/?p=4839#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.recantha.co.uk\\\/blog\\\/?p=4839\",\"url\":\"https:\\\/\\\/www.recantha.co.uk\\\/blog\\\/?p=4839\",\"name\":\"Use a 3x4 matrix keypad with the #RaspberryPi - 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For a while, several boards, such as the SenseHAT, have hogged the entire GPIO when they're just using a few pins. Now, you can get access\u2026","rel":"","context":"In &quot;Accessories&quot;","block_context":{"text":"Accessories","link":"https:\/\/www.recantha.co.uk\/blog\/?cat=54"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2017\/02\/gpio-intercept.jpg?fit=800%2C600&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2017\/02\/gpio-intercept.jpg?fit=800%2C600&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2017\/02\/gpio-intercept.jpg?fit=800%2C600&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.recantha.co.uk\/blog\/wp-content\/uploads\/2017\/02\/gpio-intercept.jpg?fit=800%2C600&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":10478,"url":"https:\/\/www.recantha.co.uk\/blog\/?p=10478","url_meta":{"origin":4839,"position":5},"title":"New standards for GPIO boards on the #RaspberryPi B+","author":"Michael Horne","date":"23 July 2014","format":false,"excerpt":"There are two pins on the GPIO on the new B+ all to do with EEPROM. 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