Introduction to Arduino - Arduino Sketches: Tools and Techniques for Programming Wizardry - page 12

inputs. It also has a large amount of l ash memory: 256 KB, capable of storing
larger programs than the Uno. It also has generous SRAM and EEPROM: 8 KB
and 4 KB, respectively. It also has 4 hardware UART ports, making it an ideal
platform for communicating with multiple devices serially.
Figure 1-5: The Arduino Ethernet
Arduino Mega boards are used when large amount of inputs and outputs
are required. It is shown in Figure 1-6.
Figure 1-6: The Arduino Mega 2560