still ain't working but idea

so i found out that the items never leave the chest but i dont know how do i detect a new item has been added to a chestshop(like a stackable item) how would i get a redstone output everytime a new item was added to a stack

 

a comparator detects when items are in a chest the more items the stronger the signal

 

Adriansop homie Adrian can help

 

i asked him he called me and idiot for nor not reading the island desc even thought there was nothing "read the island description idiot" is what he said so D: