#define F_CPU 1000000 // We start with 8x prescaler on 8Mhz clock
#define delay_ms_1Mhz(x) (_delay_ms(x)) // Delay when prescaller set to 8x
#define delay_ms_8Mhz(x) (_delay_ms(x*8)) // Delay when prescaller set to 1x so we need to burn 8x as many cycles