Check if number within one of many ranges

[Math808]

I need a system that continuously checks if my analog input is within 1 of 30 different ranges starting at 0-0.5 and then increasing the upper value by 20% (e.g. 0-0.5, 0.5-0.6, 0.6-0.72, etc.). I am able to do so by using a case structure with 30 different cases, however, is there an easier way to do it where I would need so many different cases? It is super time-consuming to make and if small changes have to be made in the program.

Thank you for your help.

[crossrulz · Accepted solution]

Look at Threshold 1D Array.  You can give it an array for your ranges and your value and it will give you a fractional index of where your number would fit in the array.  You can round it towards -Inf to get an index of which range it was in.  Your array will want additional points in your array for -Infinity and +Infinity.  This will make the first valid range index 1.

EDIT:  Ok, some of my advice was slightly off.  Here is what I came up with with some tweaks as I played around.

[MichaelBalzer · Accepted solution]

Another variation is to check the range in a 30 iteration loop, changing the upper and lower limit on each iteration. If the value is within a range, stop the loop.

A stacked shift register is used to track the upper and lower limits, which allows the previous iteration's upper limit to be used as this iteration's lower limit.