Scaling ranges of numbers

[mattallen37]

With almost any program that involves a motor speed or sensor value, I end up scaling numbers. I don't know if anyone is interested, but for those who are, I posted on my blog an NXC function that does the math. Using this, I don't have to come up with everything I need every time. You just enter the original number as well as the lowest and highest the value can be and the lowest and highest you want it to be, and it returns the scaled result.

When I say "lowest and highest you want it to be", I mean the two numbers you want it scaled to. It doesn't matter if the first is higher than the second.

[HaWe]

could you please explain a little more, maybe with some examples? I don't understand your function so far.

[hergipotter]

could you please explain a little more, maybe with some examples? I don't understand your function so far.

there is an example in the blog post.

[HaWe]

can't find any. can you post it all in code tags? Is easier to read those codes here in this thread anyway.

[mattallen37]

It's a function that takes a range of numbers, and scales it into a different range. Imagine you were to make a PID control loop for something like line following. If the control loop was looking for error values of -5 to 5, and your sensor returned values in the range of 74 to 192, you could scale it like this:

Code: Select all

char error = ScaleRange(Sensor, 74, 192, -5, 5);

[HaWe]