Delay 1 cycle A nop instruction, allowing you to waste one cycle (62.5ns on a 16MHz Arduino) is created using this inline assembly: __asm__ __volatile__ ("nop\n\t"); Or can be made into a define using this: #define NOP __asm__ __volatile__ ("nop\n\t") Delay mS delay(1000); //Time in mS   Value is unsigned long, so up to 4,294,967,295 (32-bit)