User Manual

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When the sketch window opens, enlarge it so that you can see the entire sketch in
the window.
The example sketches included with the Arduino IDE are 'read-only'. That is, you can
upload them to an MEGA2560 R3 board, but if you change them, you cannot save
them as the same file.
Since we are going to change this sketch, the first thing you need to do is save your
own copy.
From the File menu on the Arduino IDE, select 'Save As..' and then save the sketch
with the name 'MyBlink'.