Introduction: Extra Io Pins MCP23017
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 3: Upload the Code
Upload this code(put them all in one map)
Step 4: Subscribe
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Eric Brouwer made it!
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