Actually the code works great like this. When i use code that came with the FM shield it scrolls though the frequencies and skip's most of them as the radio is looking for the next channel. But this is not what i want, i want it to scan frequency by frequency, what works with my home brew craftet sketch (if only i could use gaffer tape as a solution ;).
The code how it is now scans every 100rds of a frequency what is what i want.
But addiotional to this code i want to add a switch.
Meaning that when
switch is off, the sketch runs as is
when the switch is "on" it searches for frequencies randomly (99.1 108.5 101.3 92.5 ... and so on).
Thats basicly what i want to do for now sure additionally there could be a seperate switch that make the skech run backwards (instead of 97.0-108.9 108.9-97.0).
But for now i would be happy to have a solution for the first challenge ;)....