{"id":432,"date":"2024-08-26T05:18:28","date_gmt":"2024-08-25T22:18:28","guid":{"rendered":"http:\/\/www.tneutron.net\/mikro\/?p=432"},"modified":"2024-08-21T07:55:34","modified_gmt":"2024-08-21T00:55:34","slug":"microcontroller-interface-with-keyboard","status":"publish","type":"post","link":"https:\/\/www.tneutron.net\/mikro\/microcontroller-interface-with-keyboard\/","title":{"rendered":"Microcontroller Interface With Keyboard"},"content":{"rendered":"<p><span class=\"notranslate\">The keyboard is used to enter data, and other values \u200b\u200bto the system microcontroller.<\/span> <span class=\"notranslate\"> Keyboard normally available in three configurations, namely: linear keyboard, matrix keyboard and the keyboard is encoded.<\/span> <span class=\"notranslate\"> Linear keyboard is used when the number of inputs to be given a little.<\/span> <span class=\"notranslate\"> The keyboard is generally used is a matrix keyboard.<\/span> <span class=\"notranslate\"> When the keyboard is connected to the microcontroller, the following factors should be considered,<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>1. Contact Bounce (bounce)<\/strong><\/span><br \/>\n<span class=\"notranslate\"> Contact bounce refers to the oscillation of the contact when the button is pressed (Fig. 1.23).<\/span> <span class=\"notranslate\"> quality keyboard has a bounce period 1-5 mdetik.Jjika bounce ignored microcontroller responds to the button is pressed and released beberapakali when in fact only pressed once.<\/span> <span class=\"notranslate\"> Contact dbouncing through hardware or software made for meghindari effect several times kontakyang undesirable when the contact closes, thus we will get only a single operating ON and OFF.<\/span><\/p>\n<p><span class=\"notranslate\"> Hardware debouncing is done using the RC circuit (Figure 1:24 (a) or a Schmitt trigger circuit (Figure 1:24 (b), if debouncing done using software, the delay time given is 20 -50 ms fter button is pressed sebeum executable program.<\/span><\/p>\n<p><a href=\"http:\/\/i1.wp.com\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2015\/08\/image42.png\"><img loading=\"lazy\" decoding=\"async\" title=\"image\" src=\"http:\/\/i2.wp.com\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2015\/08\/image_thumb44.png?resize=406%2C124\" alt=\"image\" width=\"406\" height=\"124\" border=\"0\" \/><\/a><\/p>\n<p><span class=\"notranslate\"> Figure 24 Bounce contact<\/span><\/p>\n<p><a href=\"http:\/\/i0.wp.com\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2015\/08\/image48.png\"><img loading=\"lazy\" decoding=\"async\" title=\"image\" src=\"http:\/\/i1.wp.com\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2015\/08\/image_thumb49.png?resize=187%2C115\" alt=\"image\" width=\"187\" height=\"115\" border=\"0\" \/><\/a><\/p>\n<p><span class=\"notranslate\"> Figure 25 Hardware debouncing by using the RC circuit<\/span><\/p>\n<p><a href=\"http:\/\/i0.wp.com\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2015\/08\/image52.png\"><img loading=\"lazy\" decoding=\"async\" title=\"image\" src=\"http:\/\/i2.wp.com\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2015\/08\/image_thumb52.png?resize=358%2C148\" alt=\"image\" width=\"358\" height=\"148\" border=\"0\" \/><\/a><\/p>\n<p><span class=\"notranslate\"> Figure 26 Hardware debouncing by using a Schmitt trigger<\/span><\/p>\n<p><span class=\"notranslate\"> <strong>2. Multiple key.<\/strong><\/span><\/p>\n<p><span class=\"notranslate\"> If more than one button is pressed, then only the keys are valid only be executed.<\/span><br \/>\n<span class=\"notranslate\"> <strong>3. Key hold.<\/strong><\/span><\/p>\n<p><span class=\"notranslate\"> There are two types of keyboard actuation, namely: two-key lock-out and the N-key rollover.<\/span> <span class=\"notranslate\"> Two-key lockout takes into account only one button is pressed.<\/span> <span class=\"notranslate\"> While the N key rollover will ignore all buttons pressed until only one who suppressed.<\/span> <span class=\"notranslate\"> 1:25 Picture shows the relationship matrix keypad with mikrokontroler.Di-16 here, each column and row are connected to the microcontroller pins.<\/span><\/p>\n<p><span class=\"notranslate\"> The column is usually at the level HIGH.<\/span> <span class=\"notranslate\"> Lane configured as an output and the column is used as a line scan.<\/span> <span class=\"notranslate\"> Button actuation censored by sending a LOW signal to every lane and every moment only one lane censored.<\/span><\/p>\n<p><a href=\"http:\/\/i1.wp.com\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2015\/08\/image55.png\"><img loading=\"lazy\" decoding=\"async\" title=\"image\" src=\"http:\/\/i1.wp.com\/www.tneutron.net\/mikro\/wp-content\/uploads\/sites\/5\/2015\/08\/image_thumb55.png?resize=410%2C388\" alt=\"image\" width=\"410\" height=\"388\" border=\"0\" \/><\/a><\/p>\n<p><span class=\"notranslate\"> Figure 27 Relationship matrix 16-button keypad with microcontroller<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The keyboard is used to enter data, and other values \u200b\u200bto the system microcontroller. Keyboard normally available in three configurations,<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[1238],"tags":[423,427,418,422,421,419,420,426,424,425],"class_list":["post-432","post","type-post","status-publish","format-standard","hentry","category-english","tag-8051-microcontroller-keyboard-interfacing","tag-microcontroller-hid-keyboard","tag-microcontroller-keyboard","tag-microcontroller-keyboard-c","tag-microcontroller-keyboard-emulator","tag-microcontroller-keyboard-interfacing","tag-microcontroller-keyboard-usb","tag-microcontroller-ps2-keyboard","tag-pic-microcontroller-keyboard","tag-pic-microcontroller-keyboard-interface"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Microcontroller Interface With Keyboard - TN Mikro<\/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.tneutron.net\/mikro\/microcontroller-interface-with-keyboard\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Microcontroller Interface With Keyboard - TN Mikro\" \/>\n<meta name=\"twitter:description\" content=\"The keyboard is used to enter data, and other values \u200b\u200bto the system microcontroller. 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