https://wiki.jw-tech.eu/index.php?action=history&feed=atom&title=WSAL15391_%E2%80%93_MCP23017_IO_Expansion_Board%2Fen 2026-10-23T21:25:49Z Versionsgeschichte dieser Seite in JW Tech Wiki MediaWiki 1.43.9 https://wiki.jw-tech.eu/index.php?title=WSAL15391_%E2%80%93_MCP23017_IO_Expansion_Board/en&diff=1634&oldid=prev 2026-09-05T22:33:47Z

<p>Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex</p> <p><b>Neue Seite</b></p><div>__NOINDEX__<br /> &#039;&#039;&#039;Documentation notice:&#039;&#039;&#039; This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.<br /> <br /> == Summary ==<br /> The Waveshare board expands 16 digital I/O lines over the I2C bus using the MCP23017 IC. In the example, 8 pins are used as key inputs and 8 pins as LED outputs.<br /> <br /> == Related products at JW Tech ==<br /> * [https://shop.jw-tech.eu/p/WSAL15391 WSAL15391 – MCP23017 IO Expansion Board, Expands 16 I/O Pins]<br /> <br /> == Technical overview ==<br /> * Base component: MCP23017 (16-bit I/O expander)<br /> * Interface: I2C<br /> * Provides 16 I/O pins in total<br /> * Example configuration: 8 inputs for keys, 8 outputs for LEDs<br /> * Multiple modules can be connected in parallel on the same I2C bus<br /> * Each additional module requires a unique I2C address<br /> * Addressing via jumpers A0, A1, A2: open = high level, shorted = low level<br /> * This allows up to 8 distinct addresses (2^3)<br /> <br /> == Notes and version constraints ==<br /> * The exact I2C base address of the MCP23017 is not stated in the source text; it must be taken from the datasheet.<br /> * The source contains no specific commands or code examples; available resources (User Manual, Schematic, Code, Datasheets) are only linked but not shown.<br /> * The statement &#039;up to 8 modules at the same time&#039; is derived from the address space size (3 address pins), not an explicit manufacturer claim about bus load.<br /> * No information on power supply, voltage range, drivers, or compatibility with specific microcontrollers is present in the source document.<br /> <br /> == Source and revision record ==<br /> * [https://www.waveshare.com/wiki/MCP23017_IO_Expansion_Board MCP23017 IO Expansion Board - Waveshare Wiki]<br /> * Source revision: 76489<br /> * Captured: 2026-08-31T02:48:45+00:00<br /> * SHA-256: &lt;code&gt;5ebf23b2721e4ec2a74ea4ef71a2022b79645b3028ce2bb3d785d6bcfdcad8d9&lt;/code&gt;</div>

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