Hardware Reference
In-Depth Information
Figure 1-3: The Arduino Uno
The Leonardo (see Figure 1-4) uses the 32U4 as the main microcontroller,
which has a USB interface built in. Therefore, it doesn't need a secondary MCU
to perform the serial-to-USB conversion. This cuts down on the cost and enables
you to do unique things like emulate a joystick or a keyboard instead of a simple
serial device. You will learn how to use these features in Chapter 6, “USB and
Serial Communication.”
Figure 1-4: The Arduino Leonardo
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