{"product_id":"pcf8574t-io-expansion-module-i2c-electronic-building-block-1","title":"PCF8574T IO Expansion Module – I2C Electronic Building Block","description":"\n\u003ch2\u003ePCF8574T IO Expansion Module – I2C Electronic Building Block\u003c\/h2\u003e\n\u003cp\u003eExpand your microcontroller's capabilities with the \u003cstrong\u003ePCF8574T IO Expansion Module\u003c\/strong\u003e. This compact I2C-based electronic building block allows you to extend the number of digital input\/output pins on your Arduino, Raspberry Pi, or other compatible microcontroller boards — all over a simple two-wire I2C bus. Perfect for hobbyists, students, and electronics enthusiasts looking to build smarter, more complex projects without the complexity.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePCF8574T Chip:\u003c\/strong\u003e Industry-standard 8-bit I\/O expander with I2C interface for easy integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eI2C Communication:\u003c\/strong\u003e Uses just two signal lines (SDA \u0026amp; SCL), saving precious pins on your main board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfigurable Address:\u003c\/strong\u003e On-board address jumpers allow up to 8 modules to be used on the same I2C bus simultaneously\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Works seamlessly with Arduino, Raspberry Pi, ESP8266, ESP32, STM32, and other popular development boards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Breadboard-Friendly:\u003c\/strong\u003e Small form factor fits neatly into any project enclosure or breadboard setup\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupt Output:\u003c\/strong\u003e Onboard interrupt pin (INT) signals the host processor when any input changes state — ideal for event-driven designs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Power Consumption:\u003c\/strong\u003e Efficient design makes it suitable for battery-powered and portable projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eChip:\u003c\/strong\u003e PCF8574T\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterface:\u003c\/strong\u003e I2C (up to 400 kHz)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eI\/O Pins:\u003c\/strong\u003e 8 bidirectional I\/O ports\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e 2.5V – 6V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAddressable Range:\u003c\/strong\u003e 0x20 – 0x27 (8 unique addresses)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInterrupt Output:\u003c\/strong\u003e Active LOW open-drain\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eForm Factor:\u003c\/strong\u003e PCB module with standard pin header\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eWhether you're a beginner building your first electronics project or an experienced maker tackling a complex build, the PCF8574T IO Expansion Module is an affordable and reliable solution. It's great for controlling LED arrays, reading multiple button inputs, driving LCD displays (commonly used as an I2C LCD backpack), and much more.\u003c\/p\u003e\n\n\u003ch3\u003eGreat Pairings for Your DIY Projects\u003c\/h3\u003e\n\u003cp\u003eExplore more components and creative building supplies in our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/ccb-flat-round-spacer-beads-diy-jewelry-making\"\u003e4\/6mm CCB Flat Round Spacer Beads DIY Jewelry Making 100-200pcs\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/round-aluminum-wire-diy-jewelry-making-1mm-3mm\"\u003eRound Aluminum Wire 1mm–3mm | DIY Jewelry Making Wire\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is the PCF8574T IO Expansion Module and what does it do?\u003c\/h4\u003e\n\u003cp\u003eA: The PCF8574T IO Expansion Module is an I2C-based digital I\/O expander that adds 8 extra input\/output pins to your microcontroller (such as Arduino or Raspberry Pi) using only two communication lines. It is ideal for projects that require more GPIO pins than your main board provides.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is the PCF8574T IO Expansion Module compatible with Arduino and Raspberry Pi?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The PCF8574T module is fully compatible with Arduino, Raspberry Pi, ESP8266, ESP32, STM32, and virtually any microcontroller that supports the I2C protocol. Simply connect SDA, SCL, VCC, and GND to get started.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use multiple PCF8574T modules in a single project?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. Each module features configurable address jumpers that allow you to set a unique I2C address (0x20 through 0x27), meaning you can connect up to 8 PCF8574T modules on the same I2C bus — giving you up to 64 additional I\/O pins in a single project.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What projects can I build with this IO expansion module?\u003c\/h4\u003e\n\u003cp\u003eA: Common applications include controlling LED arrays, reading multiple button or switch inputs, driving I2C LCD displays, building keyboard matrices, home automation controllers, and any project where you need more digital I\/O than your board natively provides.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the PCF8574T IO Expansion Module and what does it do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The PCF8574T IO Expansion Module is an I2C-based digital I\/O expander that adds 8 extra input\/output pins to your microcontroller (such as Arduino or Raspberry Pi) using only two communication lines. It is ideal for projects that require more GPIO pins than your main board provides.\"}}, {\"@type\": \"Question\", \"name\": \"Is the PCF8574T IO Expansion Module compatible with Arduino and Raspberry Pi?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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Each module features configurable address jumpers that allow you to set a unique I2C address (0x20 through 0x27), meaning you can connect up to 8 PCF8574T modules on the same I2C bus — giving you up to 64 additional I\/O pins in a single project.\"}}, {\"@type\": \"Question\", \"name\": \"What projects can I build with this IO expansion module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Common applications include controlling LED arrays, reading multiple button or switch inputs, driving I2C LCD displays, building keyboard matrices, home automation controllers, and any project where you need more digital I\/O than your board natively provides.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"PCF8574T IO Expansion Module – I2C Electronic Building Block\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/products\/pcf8574t-io-expansion-module-i2c-electronic-building-block\"}]}\u003c\/script\u003e","brand":"Zpaxo","offers":[{"title":"Default Title","offer_id":54266075152694,"sku":"\u003cnone\u003e","price":3.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0989\/7774\/3158\/files\/S8e3b0105bdc14558b04f71bcc7d0151cR.webp?v=1784717021","url":"https:\/\/zpaxo.com\/products\/pcf8574t-io-expansion-module-i2c-electronic-building-block-1","provider":"Zpaxo","version":"1.0","type":"link"}