{"id":1704,"date":"2016-06-04T14:25:24","date_gmt":"2016-06-04T12:25:24","guid":{"rendered":"http:\/\/tinusaur.org\/?page_id=1704"},"modified":"2022-01-01T23:04:05","modified_gmt":"2022-01-01T21:04:05","slug":"irrelib","status":"publish","type":"page","link":"https:\/\/tinusaur.org\/projects\/irrelib\/","title":{"rendered":"IRRELib"},"content":{"rendered":"<p>IRRELib is a library for working with IR (infrared) receivers and processing remote control commands. The library handles the NEC infrared remote control protocol used in wide variete of devices today. The code is written specifically for ATtiny85 and\u00a0is part of the Tinusaur project. As a\u00a0receiver in the examples is used the\u00a0TSOP4838 by\u00a0Vishay.<\/p>\n<h1>Sending and Receiving<\/h1>\n<p>The transmission of the IR commands requires only a microcontroller and an infrared LED, available from a wide variety of sources. The easiest way to\u00a0send commands is to use a general purpose (universal) remote control.<\/p>\n<p>The reception of the modulated commands for the NEC protocols is easily accomplished with specialized IR receivers, most readily available from Sharp Corporation and Vishay Intertechnology. These receivers include a photo-diode, an automatic gain control (AGC) circuit, and a demodulator. The demodulated signal is then decoded with a microcontroller.<\/p>\n<h1>TSOP4838 Receiver<\/h1>\n<p><a href=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/tsop4838-infrared-receiver_c700x500.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-1712 size-medium\" style=\"margin-bottom:24px\" src=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/tsop4838-infrared-receiver_c700x500.jpg?w=300\" alt=\"VISHAY TSOP4838 Infrared Receiver, Remote Control, 38 kHz\" width=\"300\" height=\"214\" srcset=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/tsop4838-infrared-receiver_c700x500.jpg 700w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/tsop4838-infrared-receiver_c700x500-300x214.jpg 300w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/tsop4838-infrared-receiver_c700x500-269x192.jpg 269w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a>As part of the development of this library, an infrared receiver is used &#8211; more specifically the Vishay TSOP4838 that works\u00a0at \u00a038 kHz.<\/p>\n<p>The TSOP4838 are miniaturized IR receiver modules for infrared remote\u00a0control systems. A PIN diode and a preamplifier are\u00a0assembled on lead frame, the epoxy package contains an IR\u00a0filter.\u00a0The demodulated output signal can be directly connected to\u00a0a microprocessor for decoding.\u00a0They are optimized to\u00a0suppress almost all spurious pulses from Wi-Fi and CFL\u00a0sources. They may suppress some data signals if\u00a0continuously transmitted.<\/p>\n<p>More technical information about the TSOP4838 receiver as PDF is available at:<br \/>\nhttp:\/\/www.vishay.com\/docs\/82459\/tsop48.pdf<\/p>\n<h1>The Protocol<\/h1>\n<p>There are many protocols for sending and receiving IR commands.<\/p>\n<p>The most commonly used protocol is the NEC protocol, which specifies a carrier frequency of 38 kHz. The NEC protocol is used by the vast majority of Japanese-manufactured consumer electronics.\u00a0In the NEC protocol, each manufacturer is assigned a unique code that is contained in the transmitted command, avoiding the possibility of false triggering by other remote handsets.<\/p>\n<p>This library uses the NEC protocol.<\/p>\n<p>The received data consists of 32 bits or 4\u00a0bytes where<\/p>\n<ul>\n<li>1st byte is the device id<\/li>\n<li>2nd byte is the same id but inverted<\/li>\n<li>3rd byte is the command code<\/li>\n<li>4th byte is the command but inverted<\/li>\n<\/ul>\n<p>It is important to note that\u00a0not all transmitters (remote controls) follow that format &#8211; sometimes the supposed inverted bytes contain other data instead.<\/p>\n<figure id=\"attachment_1723\" aria-describedby=\"caption-attachment-1723\" style=\"width: 690px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500.png\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1723 size-large\" src=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500.png?w=700\" alt=\"NEC Transmission Code\" width=\"700\" height=\"250\" srcset=\"https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500.png 1400w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500-300x107.png 300w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500-1024x366.png 1024w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500-768x274.png 768w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500-772x276.png 772w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500-1230x439.png 1230w, https:\/\/tinusaur.org\/wp-content\/uploads\/sites\/9\/2016\/06\/nec_transmission_code_c1400x500-314x112.png 314w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/a><figcaption id=\"caption-attachment-1723\" class=\"wp-caption-text\">NEC Transmission Code<\/figcaption><\/figure>\n<p>More technical information about the communication protocols as PDF is available at:<br \/>\nhttp:\/\/www.vishay.com\/docs\/80071\/dataform.pdf<\/p>\n<h1>The Library<\/h1>\n<p>The library is receiving the commands the calls a user defined function every time there is a command providing a data structure (rather a pointer to it) that contains the data &#8211; the 4 bytes.<\/p>\n<p>Here is a source code fragment showing the user defined receiving function<\/p>\n<pre class=\"brush: cpp; title: ; notranslate\" title=\"\">\nvoid irrelib_received_userfunc(irrelib_data_p received_data) {\n    switch ((*received_data).status) {\n        case IRRELIB_STATUS_OK:\n            \/\/ Every time a command is received ...\n            PORTB ^= (1 &amp;lt;&amp;lt; LED5_PORT);  \/\/ Flip the bit\n        break;\n        case IRRELIB_STATUS_REPEAT:\n            \/\/ Every time a command is repeated ...\n        break;\n        case IRRELIB_STATUS_ERROR:\n            \/\/ Every time there is an error ...\n        break;\n    }\n}\n<\/pre>\n<p>The command is accessible through a\u00a0<strong>(*received_data).com_id<\/strong> expression.<\/p>\n<p>Since this library (the projects) is work in progress the best ways to see how it works and how to use it is to look at the source code &#8211; it has a lot of comments. It also has a sample testing program that lights up some LED&#8217;s upon receiving commands.<\/p>\n<h1>External Resources<\/h1>\n<p>The source code of the IRRELib library is available at:<br \/>\nhttps:\/\/bitbucket.org\/tinusaur\/irrelib<\/p>\n<h2>Credits<\/h2>\n<p>As it is mentioned in the source code \u00a0part of this work was inspired by and based on the &#8220;ATtiny85 IR Remote Control Receiver&#8221; by David Johnson-Davies<br \/>\n<strong>Technoblogy\u00a0<\/strong>http:\/\/www.technoblogy.com<br \/>\nIR Remote Control Receiver: http:\/\/www.technoblogy.com\/show?V6F<br \/>\nIR Remote Control Tool (NEC): http:\/\/www.technoblogy.com\/show?UVE<\/p>\n<h2>Other projects and useful links<\/h2>\n<p>Consumer IR<br \/>\nhttps:\/\/en.wikipedia.org\/wiki\/Consumer_IR<\/p>\n<p>NEC Protocol IR (Infrared) Remote Control With a Microcontroller<br \/>\nhttp:\/\/www.circuitvalley.com\/2013\/09\/nec-protocol-ir-infrared-remote-control.html<\/p>\n<p>NEC protocol compatible infrared remote decoder lib for Atmel AVR<br \/>\nhttps:\/\/github.com\/MalteP\/nec-decoder<\/p>\n<p>TinyPCRemote \u2013 An ATtiny85 Based Infrared PC remote control<\/p>\n<h3>Projects<\/h3>\n<p>How to use the IR library with an attiny<br \/>\nhttp:\/\/www.instructables.com\/id\/Attiny-IR-library\/<\/p>\n<p>ATtiny &amp; IR remote control Wiebelbot<br \/>\nhttp:\/\/www.instructables.com\/id\/Wiebelbot\/<\/p>\n<p>Infrared Dedicated Decoder<br \/>\nhttps:\/\/www.hackster.io\/rayburne\/infrared-dedicated-decoder-c10052<\/p>\n<p>Scavenger Hunt Beacon<br \/>\nhttp:\/\/www.openhardwarehub.com\/projects\/42-Scavenger-Hunt-Beacon<\/p>\n<p>Rickrolling remote control prank<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"z3Gud79Yxj\"><p><a href=\"https:\/\/hackaday.com\/2012\/09\/10\/rickrolling-remote-control-prank\/\">Rickrolling remote control prank<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;Rickrolling remote control prank&#8221; &#8212; Hackaday\" src=\"https:\/\/hackaday.com\/2012\/09\/10\/rickrolling-remote-control-prank\/embed\/#?secret=GglzwUNzHu#?secret=z3Gud79Yxj\" data-secret=\"z3Gud79Yxj\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>https:\/\/nathan.chantrell.net\/20121014\/tinypcremote-an-attiny85-based-infrared-pc-remote-control\/<br \/>\nGitHub: https:\/\/github.com\/nathanchantrell\/TinyPCRemote<\/p>\n<p>An ATTiny85 Home Automation IR Device<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"lZHfzwFNun\"><p><a href=\"https:\/\/falldeaf.com\/2013\/11\/an-attiny85-home-automation-ir-device\/\">An ATTiny85 Home Automation IR Device<\/a><\/p><\/blockquote>\n<p><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; clip: rect(1px, 1px, 1px, 1px);\" title=\"&#8220;An ATTiny85 Home Automation IR Device&#8221; &#8212; TOM MARDIS\" src=\"https:\/\/falldeaf.com\/2013\/11\/an-attiny85-home-automation-ir-device\/embed\/#?secret=5PaPLGqtTb#?secret=lZHfzwFNun\" data-secret=\"lZHfzwFNun\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<h3><\/h3>\n","protected":false},"excerpt":{"rendered":"<p>IRRELib is a library for working with IR (infrared) receivers and processing remote control commands. The library handles the NEC infrared remote control protocol used in wide variete of devices today. The code is written specifically for ATtiny85 and\u00a0is part of the Tinusaur project. As a\u00a0receiver in the examples is used the\u00a0TSOP4838 by\u00a0Vishay. Sending and &#8230; <a title=\"IRRELib\" class=\"read-more\" href=\"https:\/\/tinusaur.org\/projects\/irrelib\/\" aria-label=\"Read more about IRRELib\">Read more<\/a><\/p>\n","protected":false},"author":54,"featured_media":0,"parent":654,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>IRRELib - The Tinusaur Project<\/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:\/\/tinusaur.org\/projects\/irrelib\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"IRRELib - The Tinusaur Project\" \/>\n<meta property=\"og:description\" content=\"IRRELib is a library for working with IR (infrared) receivers and processing remote control commands. 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The library handles the NEC infrared remote control protocol used in wide variete of devices today. The code is written specifically for ATtiny85 and\u00a0is part of the Tinusaur project. As a\u00a0receiver in the examples is used the\u00a0TSOP4838 by\u00a0Vishay. Sending and ... 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