Common features
The whole Arduino family, except Arduino Due, is based on 8-bit Atmel AVR microcontrollers, specifically those in the megaAVR series, ranging from the basic ATmega168 series used in the first Diecimila and Duemilanove models to the powerful ATmega2560 series of the latest Mega 2560 boards.
Apart from the ATmega series, the Arduino board incorporates every other electronic component necessary to make the microcontroller operate, including a crystal oscillator to set the working frequency that makes it run at up to 16 MHz.
Most models come with a USB port that enables you to connect the board directly to your computer so that you can program the microcontroller. The smaller models replace the USB connector with a direct RS-232 connection, ...
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