Most Arduino boards consist of an Atmel 8-bit AVR microcontroller (ATmega8,[28] ATmega168, ATmega328, ATmega1280, or ATmega2560) with varying amounts of flash memory, pins, and features.[29] The 32-bit Arduino Due, based on the Atmel SAM3X8E was introduced in 2012.[30] The boards use single or double-row pins or female headers that facilitate connections for programming and incorporation into other circuits. These may connect with add-on modules termed shields. Multiple and possibly stacked shields may be individually addressable via an I2C serial bus. Most boards include a 5 V linear regulator and a 16 MHz crystal oscillator or ceramic resonator. Some designs, such as the LilyPad,[31] run at 8 MHz and dispense with the onboard voltage regulator due to specific form-factor restrictions.
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