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Install the latest version of the Arduino software from arduino.cc/en/Main/Software.
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Plug up an Arduino with an ATMega3328P processor, with an LED on pin 13 (and Ground pin), over usb.
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Change your port name in
config/hardware.yml
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At the command line, run
bundle install
andrails s
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Go to localhost:3000/ in your browser and you’ll see two buttons you can click to turn the LED on and off.