{"id":16902,"date":"2026-04-19T20:56:20","date_gmt":"2026-04-19T15:26:20","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=16902"},"modified":"2026-04-19T20:56:21","modified_gmt":"2026-04-19T15:26:21","slug":"16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\/","title":{"rendered":"16 x 2 LCD Display for LMR SDR 1.1: Why four pins are not used?"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/k45peMewL40?si=A4F7fPQ5NplNTCmK\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">A 16 x 2 LCD display (16 characters, 2 lines) typically has 16 pins. But in the LMR SDR 1.1 circuit four pins (pins 7, 8, 9, 10) are not being used. That is because they are the pins NOT meant for use in 4 bit mode. They have been designated as data pins D0, D1, D2 and D3. The pins being used are as follows: <\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>1<\/td><td><strong>VSS<\/strong><\/td><td>Ground (0V)<\/td><\/tr><tr><td>2<\/td><td><strong>VDD<\/strong><\/td><td>Power Supply (+5V)<\/td><\/tr><tr><td>3<\/td><td><strong>V0\/VEE<\/strong><\/td><td>Contrast Adjustment (via 10k Potentiometer)<\/td><\/tr><tr><td>4<\/td><td><strong>RS<\/strong><\/td><td>Register Select (0=Command, 1=Data)<\/td><\/tr><tr><td>5<\/td><td><strong>R\/W<\/strong><\/td><td>Read\/Write (0=Write, 1=Read) &#8211;&nbsp;<em>Often GND<\/em><\/td><\/tr><tr><td>6<\/td><td><strong>E<\/strong><\/td><td>Enable (High-to-Low Pulse to latch data)<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>11<\/td><td><strong>D4<\/strong><\/td><td>Data Pin 4 (Used in 4-bit mode)<\/td><\/tr><tr><td>12<\/td><td><strong>D5<\/strong><\/td><td>Data Pin 5 (Used in 4-bit mode)<\/td><\/tr><tr><td>13<\/td><td><strong>D6<\/strong><\/td><td>Data Pin 6 (Used in 4-bit mode)<\/td><\/tr><tr><td>14<\/td><td><strong>D7<\/strong><\/td><td>Data Pin 7 (Used in 4-bit mode)<\/td><\/tr><tr><td>15<\/td><td><strong>LED+<\/strong><\/td><td>Backlight Anode (+5V or through resistor)<\/td><\/tr><tr><td>16<\/td><td><strong>LED-<\/strong><\/td><td>Backlight Cathode (Ground)<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>A 16 x 2 LCD display (16 characters, 2 lines) typically has 16 pins. But in the LMR SDR 1.1 circuit four pins (pins 7, 8, 9, 10) are not being used. That is because they are the pins NOT meant for use in 4 bit mode. They have been designated as data pins D0, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16904,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-16902","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>16 x 2 LCD Display for LMR SDR 1.1: Why four pins are not used? - Johnson&#039;s Techworld<\/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:\/\/johnsonfrancis.org\/techworld\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"16 x 2 LCD Display for LMR SDR 1.1: Why four pins are not used? - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"A 16 x 2 LCD display (16 characters, 2 lines) typically has 16 pins. But in the LMR SDR 1.1 circuit four pins (pins 7, 8, 9, 10) are not being used. That is because they are the pins NOT meant for use in 4 bit mode. They have been designated as data pins D0, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-19T15:26:20+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-19T15:26:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2026\/04\/16-x-2-LCD-Display-for-LMR-SDR-1.1-Why-four-pins-are-not-used.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"677\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"16 x 2 LCD Display for LMR SDR 1.1: Why four pins are not used?\",\"datePublished\":\"2026-04-19T15:26:20+00:00\",\"dateModified\":\"2026-04-19T15:26:21+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\\\/\"},\"wordCount\":142,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2026\\\/04\\\/16-x-2-LCD-Display-for-LMR-SDR-1.1-Why-four-pins-are-not-used.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/16-x-2-lcd-display-for-lmr-sdr-1-1-why-four-pins-are-not-used\\\/\",\"name\":\"16 x 2 LCD Display for LMR SDR 1.1: Why four pins are not used? 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