Length of time between pulses ?

Ah thanks, it was just my reading to code the wrong way around if see what I mean

In the very dim and distant past I used mess about with assembler for 6502 and Z80 processors a BBC 'B' and ZX81 remember them ? in the 80's but C seems a hell of a lot easier, I should have learnt it sooner I had printed out a C tutorial from the 80's on a dot matrix printer but never really got into it - no Arduino then I guess !. It's almost as easy as BBC basic !

10 for a= 1 to 10
20 print a
30 next a

Thanks again !

Dave