Arduino Uno Compatible Boards

there many Arduino Uno compatible boards but i am confused about it. the Uno now uses an ATmega16U2, 32U4 etc.

do i need to change my code if i use this board? code uses interrupt and timers., is there any that i need to change?

The UNO uses ATmega328P pretty long time. ATmega16U2 on the UNO board is in the role of USB/serial transceiver. Some other, compatible, boards can use FT232 chip or CH340... at this place, but it has nothing with main MCU ATmega328P. Simple answer is NO.

THANK YOU VERY MUCH :smiley: