Limiting routine

[AndrewB]

I am reading two analogue inputs (0-1023) and following these on two analogue outputs but would like to cap the two outputs so that the combined total of the two outputs does not exceed 1023.

e.g when both inputs are 1023 then both outputs would be 512.
if input 1 is 0 and input 2 is 1023 the output 1 is 0 and output 2 is 1023

Is there a way to do this without having a complex if then routine.

[Jerry Messina]

How would you want other cases handled, like input1=512 and input2=700?
What if both were 700?

I think we need some more info.

[AndrewB]

Hi Jerry, I want it to increment and decrement in steps of one.

The outputs limited to a percentage total. Say 50% of the total of in1 + in2 1023 +1023 / 2 = 1023

The outputs to follow the inputs.

e.g in percent of 1023

in1 in2 out1 out2
10 70 10 70
30 70 30 70
35 70 35 65
45 65 45 55
65 65 50 50
65 35 65 35
75 35 65 35
100 1 99 1

Hope that explains it

[Jerry Messina]

something like this?

Code: Select all

const LIMIT = 100

dim in1, in2 as ushort
dim out1, out2 as ushort
dim total as ushort

' set inputs
in1 = 0
in2 = 0

' check inputs for range
if (in1 > LIMIT) then
    in1 = LIMIT
endif
if (in2 > LIMIT) then
    in2 = LIMIT
endif

' assume outputs are ok
out1 = in1
out2 = in2

' see if outputs need to be limited
total = in1 + in2
if (total > LIMIT) then
    if (in1 = in2) then         ' 50/50 split
        out1 = LIMIT/2
        out2 = LIMIT/2
    elseif (in1 > in2) then     ' limit out1
        out1 = LIMIT - in2
    else                        ' limit out2
        out2 = LIMIT - in1
    endif
endif


[AndrewB]

Thanks Jerry I will try this out.