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did you ever runned out of io pins? Than is here the solution.

Step 1: Part List

you only need a arduino and a mcp23017 (ebay)

Step 2: Watch the Video

watch this video!

Step 4: Subscribe

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<p>The MCP23017 is not a shift register, but an I2C port expander chip. It does work great to increase number of I/O ports, but it can also be used to reduce the number of wires running from one PCB to another. I love this chip.</p><p>See my application at <a href="https://www.instructables.com/id/8-Channel-Programmable-Timer/" rel="nofollow">https://www.instructables.com/id/8-Channel-Programm...</a></p>
<p>I checked out your project! It's a really nice instructable! I changed the title ;)</p>

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