A microcontroller has all or a large portion of these elements worked into a solitary chip, so it needn't bother with a motherboard and numerous parts, LEDs for instance, can be associated straightforwardly to the AVR. AVR microntrollers come in various packages,some intended for through-gap mounting and some surface mount. AVRs are accessible with 8-pins to 100-pins, despite the fact that anything 64-stick or over is surface mount as it were. A great many people begin with a DIL (Dual In Line) 28-stick chip like the ATmega328 or the 40-stick ATmega16 or ATmega32.