{"id":627,"date":"2014-01-10T13:47:57","date_gmt":"2014-01-10T13:47:57","guid":{"rendered":"http:\/\/www.horter.de\/blog\/?p=627"},"modified":"2023-01-14T17:42:00","modified_gmt":"2023-01-14T17:42:00","slug":"pcf8574-lesen-und-schreiben-mit-dem-arduino","status":"publish","type":"post","link":"https:\/\/www.horter.de\/blog\/pcf8574-lesen-und-schreiben-mit-dem-arduino\/","title":{"rendered":"Arduino PCF8574 lesen und schreiben"},"content":{"rendered":"<p>Im nachfolgenden Beispiel werden 8 Bit vom I2C-INPUT-Modul gelesen und 1:1 auf das I2C-OUTPUT-Modul ausgegeben.<\/p>\n<p>Es ist also damit m\u00f6glich mehrere digitale Signale von einer Karte auf die andere zu \u00fcbertragen.<\/p>\n<p>Die Adressierung der beiden Karten ist in der zweiten und dritten Zeile programmiert. Die auf unseren Karten aufgedruckte Adresse ist die 8-Bit Adresse. Beim Arduino muss die Slaveadresse im 7-Bit Format angegeben werden. Deshalb wird die Adresse mit dem Befehl \u00a0&gt;&gt; 1\u00a0 durch zwei geteilt.<\/p>\n<p>In den n\u00e4chsten Programmzeilen werden alle Bits der Eingangskarte im PCF8574A nach high gesetzt. High ist auch die Grundeinstellung des PCF8574(A) wenn er an die Versorgungsspannung angeschlossen wird.<\/p>\n<p><a href=\"https:\/\/www.horter.de\/blog\/wp-content\/uploads\/2014\/01\/pcf8574-lesen-und-schreiben-mit-dem-arduino.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-656 size-full\" src=\"https:\/\/www.horter.de\/blog\/wp-content\/uploads\/2014\/01\/pcf8574-lesen-und-schreiben-mit-dem-arduino.jpg\" alt=\"\" width=\"480\" height=\"360\" srcset=\"https:\/\/www.horter.de\/blog\/wp-content\/uploads\/2014\/01\/pcf8574-lesen-und-schreiben-mit-dem-arduino.jpg 480w, https:\/\/www.horter.de\/blog\/wp-content\/uploads\/2014\/01\/pcf8574-lesen-und-schreiben-mit-dem-arduino-300x225.jpg 300w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<pre class=\"code\" style=\"font-family: monospace;\"><span style=\"color: #7e7e7e;\">\/* <\/span><span style=\"color: #7e7e7e;\">\u00a0<\/span>\r\n<span style=\"color: #7e7e7e;\">\u00a0==============================================<\/span>\r\n<span style=\"color: #7e7e7e;\">\u00a0Test\u00a0I2C-Input\u00a0auf\u00a0I2C-Output\u00a0<\/span>\r\n<span style=\"color: #7e7e7e;\">\u00a0==============================================<\/span>\r\n<span style=\"color: #7e7e7e;\">\u00a0*\/<\/span>\r\n\r\n#include\u00a0&lt;<span style=\"color: #cc6600;\">Wire<\/span>.h&gt;\r\n#define\u00a0I2C_IN_ADDR\u00a0112\u00a0&gt;&gt;\u00a01\u00a0<span style=\"color: #7e7e7e;\">\/\/ I2C-INPUT-Addresse als 7 Bit<\/span>\r\n#define\u00a0I2C_OUT_ADDR\u00a064\u00a0&gt;&gt;\u00a01\u00a0<span style=\"color: #7e7e7e;\">\/\/ I2C-OUTPUT-Addresse als 7 Bit<\/span>\r\n\r\n<span style=\"color: #cc6600;\">byte<\/span> WERT=0;\r\n<span style=\"color: #cc6600;\">byte<\/span> OUT_INV=0;\r\n<span style=\"color: #cc6600;\">byte<\/span> ALTWERT;\r\n\r\n<span style=\"color: #cc6600;\">void<\/span> <span style=\"color: #cc6600;\"><b>setup<\/b><\/span>() {\r\n\u00a0\u00a0<span style=\"color: #cc6600;\"><b>Serial<\/b><\/span>.<span style=\"color: #cc6600;\">begin<\/span>(9600);       <span style=\"color: #7e7e7e;\">\/\/ Serielle Schnittstelle konfigurieren<\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">begin<\/span>();             <span style=\"color: #7e7e7e;\">\/\/ I2C-Pins definieren<\/span>\r\n\r\n\u00a0\u00a0<span style=\"color: #7e7e7e;\">\/\/ setzten aller Bits der Eingabekarte auf 1<\/span>\r\n\u00a0\u00a0<span style=\"color: #7e7e7e;\">\/\/ -----------------------------------------<\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">beginTransmission<\/span>(I2C_IN_ADDR);   <span style=\"color: #7e7e7e;\">\/\/ Start \u00dcbertragung zum PCF8574<\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">write<\/span>(0xFF);                      <span style=\"color: #7e7e7e;\">\/\/ Alle Bits sind Eing\u00e4nge<\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">endTransmission<\/span>();                <span style=\"color: #7e7e7e;\">\/\/ Ende<\/span>\r\n}\r\n\r\n<span style=\"color: #cc6600;\">void<\/span> <span style=\"color: #cc6600;\"><b>loop<\/b><\/span>() { \r\n\r\n\u00a0\u00a0<span style=\"color: #7e7e7e;\">\/\/ Einlesen der Bits aus der I2C-INPUT Karte<\/span>\r\n\u00a0\u00a0<span style=\"color: #7e7e7e;\">\/\/ ------------------------------------------<\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">requestFrom<\/span>(I2C_IN_ADDR, 1);    <span style=\"color: #7e7e7e;\">\/\/ Ein Byte (= 8 Bits) vom PCF8574 lesen<\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">while<\/span>(<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">available<\/span>() == 0)         <span style=\"color: #7e7e7e;\">\/\/ Warten, bis Daten verf\u00fcgbar <\/span>\r\n\u00a0\u00a0\u00a0\u00a0;\r\n\u00a0\u00a0WERT\u00a0=\u00a0255\u00a0-\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">read<\/span>();            <span style=\"color: #7e7e7e;\">\/\/ in invertierte Eingabe wandlen     <\/span>\r\n\u00a0\u00a0\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">if<\/span> (WERT != ALTWERT) {               <span style=\"color: #7e7e7e;\">\/\/ Wert nur ausgeben wenn er sich \u00e4ndert<\/span>\r\n\u00a0\u00a0\u00a0\u00a0<span style=\"color: #cc6600;\"><b>Serial<\/b><\/span>.<span style=\"color: #cc6600;\">print<\/span>(<span style=\"color: #006699;\">\"neuer Wert: \"<\/span>);      \r\n\u00a0\u00a0\u00a0\u00a0<span style=\"color: #cc6600;\"><b>Serial<\/b><\/span>.<span style=\"color: #cc6600;\">println<\/span>(WERT);              <span style=\"color: #7e7e7e;\">\/\/ Wert auf \"Seriel Monitor\" ausgeben<\/span>\r\n\u00a0\u00a0\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">endTransmission<\/span>(<span style=\"color: #cc6600;\">true<\/span>);\r\n\u00a0\u00a0\u00a0\u00a0ALTWERT=WERT;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color: #7e7e7e;\">\/\/ und nachf\u00fchren<\/span>\r\n\u00a0\u00a0}\r\n\u00a0\u00a0\r\n\u00a0\u00a0<span style=\"color: #7e7e7e;\">\/\/ Ausgeben der gleichen Bits an die I2C-OUTPUT Karte<\/span>\r\n\u00a0\u00a0<span style=\"color: #7e7e7e;\">\/\/ --------------------------------------------------   <\/span>\r\n\u00a0\u00a0OUT_INV\u00a0=\u00a0255\u00a0-\u00a0WERT;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<span style=\"color: #7e7e7e;\">\/\/ in invertierte Ausgabe wandlen <\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">beginTransmission<\/span>(I2C_OUT_ADDR); <span style=\"color: #7e7e7e;\">\/\/ Start \u00dcbertragung zum PCF8574<\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">write<\/span>(OUT_INV);                  <span style=\"color: #7e7e7e;\">\/\/ Wert schreiben<\/span>\r\n\u00a0\u00a0<span style=\"color: #cc6600;\">Wire<\/span>.<span style=\"color: #cc6600;\">endTransmission<\/span>();               <span style=\"color: #7e7e7e;\">\/\/ Ende<\/span>\r\n\r\n}\r\n\r\n<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Im nachfolgenden Beispiel werden 8 Bit vom I2C-INPUT-Modul gelesen und 1:1 auf das I2C-OUTPUT-Modul ausgegeben. Es ist also damit m\u00f6glich mehrere digitale Signale von einer Karte auf die andere zu \u00fcbertragen. Die Adressierung der beiden Karten ist in der zweiten&#8230; <a class=\"continue-reading-link\" href=\"https:\/\/www.horter.de\/blog\/pcf8574-lesen-und-schreiben-mit-dem-arduino\/\">mehr lesen<\/a><\/p>\n","protected":false},"author":3,"featured_media":659,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[252],"tags":[82,81,83,40,79,86,67,80,7,77,78,76,84,85,87,88],"class_list":["post-627","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","tag-10-bit","tag-analog","tag-analogwert","tag-arduino","tag-ausgabe","tag-ausgang","tag-eingabe","tag-eingang","tag-i2c","tag-i2c-input","tag-i2c-output","tag-i2c-module","tag-raspberri","tag-raspberry-pi","tag-schalten","tag-signal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Arduino PCF8574 lesen und schreiben - Horter &amp; Kalb Blog<\/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.horter.de\/blog\/pcf8574-lesen-und-schreiben-mit-dem-arduino\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Arduino PCF8574 lesen und schreiben - Horter &amp; Kalb Blog\" \/>\n<meta property=\"og:description\" content=\"Im nachfolgenden Beispiel werden 8 Bit vom I2C-INPUT-Modul gelesen und 1:1 auf das I2C-OUTPUT-Modul ausgegeben. 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