thanks hendrik . for this part of the project, 4 is all that is required at same time . as they all start at the same time and end at dif times and need to be compaired against each other . the times vary on each new start so i cant see how i could do each individually and then see ?

many CCP approach with may be 2 pics running at same time ( that be new for me )with an external trigger to sync the start may be the go

ill sort the 4 input out first and get this working , in another 4 weeks ill look more at the larger input requirements , but have to consider the requirements if only to order the parts to try address a larger number

i should have got all the timer side test done by monday , will let you know the outcome

cheers

Sheldon