User Manual

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However, this installation method needs separate installation of driver.
The Arduino folder contains both the Arduino program itself and the drivers that
allow the Arduino to be connected to your computer by a USB cable. Before we
launch the Arduino software, you are going to install the USB drivers.
Plug one end of your USB cable into the Arduino and the other into a USB socket on
your computer. The power light on the LED will light up and you may get a 'Found
New Hardware' message from Windows. Ignore this message and cancel any
attempts that Windows makes to try and install drivers automatically for you.
The most reliable method of installing the USB drivers is to use the Device Manager.
This is accessed in different ways depending on your version of Windows. In
Windows 7, you first have to open the Control Panel, then select the option to view
Icons, and you should find the Device Manager in the list.
Under ‘Other Devices’, you should see an icon for ‘unknown device’ with a little
yellow warning triangle next to it. This is your Arduino.