{"id":492,"date":"2026-02-25T02:27:04","date_gmt":"2026-02-25T02:27:04","guid":{"rendered":"https:\/\/iotnoob.com\/wordpress\/?p=492"},"modified":"2026-02-25T02:28:17","modified_gmt":"2026-02-25T02:28:17","slug":"connect-arduino-%e0%b8%81%e0%b8%b1%e0%b8%9a-i2c-lcd-pcf8574","status":"publish","type":"post","link":"https:\/\/iotnoob.com\/wordpress\/2026\/02\/25\/connect-arduino-%e0%b8%81%e0%b8%b1%e0%b8%9a-i2c-lcd-pcf8574\/","title":{"rendered":"Connect Arduino \u0e01\u0e31\u0e1a I2C LCD (PCF8574)"},"content":{"rendered":"\n<p>\u0e15\u0e48\u0e2d\u0e1a\u0e2d\u0e23\u0e4c\u0e14\u0e17\u0e14\u0e25\u0e2d\u0e07\u0e02\u0e2d\u0e07\u0e40\u0e23\u0e32 Arduino \u0e01\u0e31\u0e1a \u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c I2C LCD<\/p>\n\n\n\n<p><strong>\u0e02\u0e31\u0e49\u0e19\u0e41\u0e23\u0e01<\/strong> \u0e15\u0e48\u0e2d Vcc \/ GND \/ SDA \/ SCL<\/p>\n\n\n\n<p><strong>\u0e02\u0e31\u0e49\u0e19\u0e17\u0e35\u0e48 2<\/strong> \u0e2b\u0e32 Address \u0e02\u0e2d\u0e07\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c Address \u0e02\u0e2d\u0e07 I2C LCD \u0e17\u0e35\u0e48\u0e43\u0e0a\u0e49\u0e0a\u0e34\u0e1b PCF8574(T) \u0e2b\u0e23\u0e37\u0e2d PCF8574A(T) \u0e08\u0e30\u0e21\u0e35 Address \u0e15\u0e48\u0e32\u0e07\u0e01\u0e31\u0e19\u0e19\u0e34\u0e14\u0e2b\u0e19\u0e48\u0e2d\u0e22<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>PCF8574(T)<\/td><td>0x20 &#8211; 0x27<\/td><\/tr><tr><td>PCF8574A(T)<\/td><td>0x38 &#8211; 0x3F<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Address \u0e02\u0e2d\u0e07 chip 2 \u0e23\u0e38\u0e48\u0e19\u0e19\u0e35\u0e49 vary \u0e44\u0e14\u0e49\u0e19\u0e34\u0e14\u0e2b\u0e19\u0e48\u0e2d\u0e22\u0e15\u0e32\u0e21\u0e02\u0e32 Address &#8211; A1, A2, A3<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"880\" height=\"560\" src=\"https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-2.png\" alt=\"\" class=\"wp-image-493\" srcset=\"https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-2.png 880w, https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-2-300x191.png 300w, https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-2-768x489.png 768w\" sizes=\"auto, (max-width: 880px) 100vw, 880px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"847\" height=\"222\" src=\"https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-3.png\" alt=\"\" class=\"wp-image-494\" srcset=\"https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-3.png 847w, https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-3-300x79.png 300w, https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-3-768x201.png 768w\" sizes=\"auto, (max-width: 847px) 100vw, 847px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"855\" height=\"389\" src=\"https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-4.png\" alt=\"\" class=\"wp-image-495\" srcset=\"https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-4.png 855w, https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-4-300x136.png 300w, https:\/\/iotnoob.com\/wordpress\/wp-content\/uploads\/2026\/02\/image-4-768x349.png 768w\" sizes=\"auto, (max-width: 855px) 100vw, 855px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>PCF8574<\/td><td>0<\/td><td>1<\/td><td>0<\/td><td>0<\/td><td>A2<\/td><td>A1<\/td><td>A0<\/td><\/tr><tr><td>0x20<\/td><td><\/td><td><\/td><td><\/td><td><\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0x27<\/td><td><\/td><td><\/td><td><\/td><td><\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>PCF8574A<\/td><td>0<\/td><td>1<\/td><td>1<\/td><td>1<\/td><td>A2<\/td><td>A1<\/td><td>A0<\/td><\/tr><tr><td>0x38<\/td><td><\/td><td><\/td><td><\/td><td><\/td><td>0<\/td><td>0<\/td><td>0<\/td><\/tr><tr><td>0x3F<\/td><td><\/td><td><\/td><td><\/td><td><\/td><td>1<\/td><td>1<\/td><td>1<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>\u0e42\u0e14\u0e22\u0e1b\u0e23\u0e01\u0e15\u0e34\u0e02\u0e32 A0, A1, A2 \u0e02\u0e2d\u0e07\u0e1a\u0e2d\u0e23\u0e4c\u0e14\u0e08\u0e35\u0e19\u0e21\u0e31\u0e01\u0e08\u0e30\u0e1b\u0e25\u0e48\u0e2d\u0e22\u0e25\u0e2d\u0e22 \u0e44\u0e21\u0e48\u0e21\u0e35 DIP switch \u0e43\u0e2b\u0e49 set \u0e14\u0e31\u0e07\u0e19\u0e31\u0e49\u0e19\u0e21\u0e31\u0e19\u0e40\u0e25\u0e22\u0e40\u0e1b\u0e47\u0e19 A0 = 1, A1 = 1, A2 = 1 \u0e42\u0e14\u0e22 default<\/p>\n\n\n\n<p><strong>\u0e02\u0e31\u0e49\u0e19\u0e17\u0e35\u0e48 3<\/strong> \u0e40\u0e25\u0e37\u0e2d\u0e01 Library &#8216;LiquidCrystal_PCF8574&#8217;<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include &lt;Wire.h>\n#include &lt;LiquidCrystal_PCF8574.h><\/pre>\n\n\n\n<p>\u0e40\u0e23\u0e34\u0e48\u0e21\u0e43\u0e0a\u0e49\u0e07\u0e32\u0e19<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">LiquidCrystal_PCF8574 lcd(0x3F);\n\n\/\/\u0e40\u0e2d\u0e32\u0e44\u0e27\u0e49 initial I2C bus \/\/\u0e40\u0e2b\u0e47\u0e19\u0e27\u0e48\u0e32 run \u0e04\u0e23\u0e31\u0e49\u0e07\u0e40\u0e14\u0e35\u0e22\u0e27\u0e1e\u0e2d \u0e44\u0e21\u0e48\u0e15\u0e49\u0e2d\u0e07\u0e17\u0e33\u0e1a\u0e48\u0e2d\u0e22 \u0e40\u0e1e\u0e23\u0e32\u0e30\u0e21\u0e31\u0e19\u0e2d\u0e32\u0e08\u0e08\u0e30\u0e44\u0e1b\u0e23\u0e1a\u0e01\u0e27\u0e19\u0e01\u0e32\u0e23\u0e17\u0e33\u0e07\u0e32\u0e19\u0e02\u0e2d\u0e07 I2C device \u0e2d\u0e37\u0e48\u0e19\u0e46\u0e44\u0e14\u0e49\u0e16\u0e49\u0e32\u0e21\u0e31\u0e19\u0e01\u0e33\u0e25\u0e31\u0e07\u0e17\u0e33\u0e07\u0e32\u0e19\u0e2d\u0e22\u0e39\u0e48\nWire.begin();\n\n\/\/\u0e2a\u0e48\u0e07\u0e2a\u0e31\u0e0d\u0e0d\u0e32\u0e13\u0e44\u0e1b\u0e16\u0e32\u0e21\u0e27\u0e48\u0e32\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c\u0e22\u0e31\u0e07\u0e2d\u0e22\u0e39\u0e48 \u0e41\u0e25\u0e49\u0e27\u0e1e\u0e23\u0e49\u0e2d\u0e21\u0e17\u0e33\u0e07\u0e32\u0e19\u0e2b\u0e23\u0e37\u0e2d\u0e44\u0e21\u0e48\nWire.beginTransmission(0x3F);\nerror = Wire.endTransmission();\n\n\/\/error = 0 \u0e04\u0e37\u0e2d \u0e2b\u0e32\u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c\u0e40\u0e08\u0e2d \u0e1e\u0e23\u0e49\u0e2d\u0e21\u0e17\u0e33\u0e07\u0e32\u0e19\nif (error == 0) {\n  \/\/Serial.println(\": LCD found.\");\n  lcd.begin(16, 2);  \/\/ initialize the lcd    \n  lcd.setBacklight(255);\n} else {\n  \/\/Serial.println(\": LCD not found.\");\n}  <\/pre>\n\n\n\n<p>\u0e04\u0e33\u0e2a\u0e31\u0e48\u0e07\u0e17\u0e35\u0e48\u0e43\u0e0a\u0e49\u0e1a\u0e48\u0e2d\u0e22<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>lcd.home();<\/td><td><\/td><\/tr><tr><td>lcd.clear();<\/td><td><\/td><\/tr><tr><td>lcd.setCursor(col, row);<\/td><td><\/td><\/tr><tr><td>lcd.print(&#8220;ABC&#8221;);<\/td><td>\u0e1e\u0e34\u0e21\u0e1e\u0e4c\u0e2d\u0e2d\u0e01\u0e44\u0e1b\u0e17\u0e35\u0e48\u0e15\u0e33\u0e41\u0e2b\u0e19\u0e48\u0e07 cursor \u0e19\u0e31\u0e49\u0e19 \u0e2b\u0e25\u0e31\u0e07\u0e08\u0e32\u0e01\u0e19\u0e31\u0e49\u0e19\u0e40\u0e25\u0e37\u0e48\u0e2d\u0e19 cursor \u0e2d\u0e2d\u0e01\u0e44\u0e1b\u0e40\u0e23\u0e37\u0e48\u0e2d\u0e22\u0e46<br>\u0e14\u0e31\u0e07\u0e19\u0e31\u0e49\u0e19 \u0e2b\u0e25\u0e31\u0e07\u0e08\u0e32\u0e01\u0e1e\u0e34\u0e21\u0e1e\u0e4c \u0e40\u0e23\u0e32\u0e44\u0e21\u0e48\u0e15\u0e49\u0e2d\u0e07\u0e40\u0e25\u0e37\u0e48\u0e2d\u0e19 cursor \u0e44\u0e1b\u0e15\u0e33\u0e41\u0e2b\u0e19\u0e48\u0e07\u0e15\u0e48\u0e2d\u0e44\u0e1b\u0e40\u0e2d\u0e07<\/td><\/tr><tr><td><\/td><td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-red-color\"><strong>\u0e22\u0e31\u0e07\u0e44\u0e21\u0e48\u0e08\u0e1a<\/strong><\/mark><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0e15\u0e48\u0e2d\u0e1a\u0e2d\u0e23\u0e4c\u0e14\u0e17\u0e14\u0e25\u0e2d\u0e07\u0e02\u0e2d\u0e07\u0e40\u0e23\u0e32 Arduino \u0e01\u0e31\u0e1a \u0e2d\u0e38\u0e1b\u0e01\u0e23\u0e13\u0e4c I2C LCD \u0e02\u0e31\u0e49\u0e19\u0e41\u0e23\u0e01 \u0e15\u0e48\u0e2d Vcc \/ GND \/ SDA \/ SCL&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-492","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/posts\/492","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/comments?post=492"}],"version-history":[{"count":2,"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/posts\/492\/revisions"}],"predecessor-version":[{"id":498,"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/posts\/492\/revisions\/498"}],"wp:attachment":[{"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/media?parent=492"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/categories?post=492"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/iotnoob.com\/wordpress\/wp-json\/wp\/v2\/tags?post=492"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}