Like you can see in the screenshot, I build a hopper tower, but if you throw an item into the first hopper, the comparator won't give a signal
MC-49881
Hoppers transport items down to quick
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marcono1234
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Minecraft 14w08a
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They're intended to move items quickly. If you want to use a comparitor put a chest between the hoppers and the comparitor on the chest. It'll have enough delay to register. at that point
I use this setup for my Minecart Chest auto Load and Unload Setups