I’m learning redstone. How can I exactly detect 20 items as the input of a furnace with a comparator?
I want the furnace to send a redstone signal if it has 20 items or more in its input, but not less. How can I do it? Do I have to use a comparator and another storage block or something?
With just a comparator you can’t do it exactly on 20. Here is a table of values you can read, but keep in mind that this is the total of all slots combined.
[https://minecraft.wiki/w/Redstone_Comparator#Fullness_of_containers](https://minecraft.wiki/w/Redstone_Comparator#Fullness_of_containers)
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To get closest to 20 (19) you could maybe use a decorated pot as buffer and flush the pot to the furnace when it triggers.
Or maybe use 2 pots and flush them both at power level 3. Gets you double hopperspeed (not needed for a furnace, but ok 😉 exactly at 20 or above.
BlattaOrientalis on
You can’t unfortunately. The most practical solution would be to have a butcher that sends kelp in multiples of 20, which can be done by a counter circuit or a comparator along with a container that happens to have one of the signal strength increment at a multiple of 20
Yes, it’s kinda complicated but it should only matter for the last furnace, since the other one should be constantly filled with kelp and thus will never run out of kelp while the fuel is still going (unless you turn off the farm but that’s not really worth the trouble)
2 Comments
With just a comparator you can’t do it exactly on 20. Here is a table of values you can read, but keep in mind that this is the total of all slots combined.
[https://minecraft.wiki/w/Redstone_Comparator#Fullness_of_containers](https://minecraft.wiki/w/Redstone_Comparator#Fullness_of_containers)
<edit>
To get closest to 20 (19) you could maybe use a decorated pot as buffer and flush the pot to the furnace when it triggers.
Or maybe use 2 pots and flush them both at power level 3. Gets you double hopperspeed (not needed for a furnace, but ok 😉 exactly at 20 or above.
You can’t unfortunately. The most practical solution would be to have a butcher that sends kelp in multiples of 20, which can be done by a counter circuit or a comparator along with a container that happens to have one of the signal strength increment at a multiple of 20
Yes, it’s kinda complicated but it should only matter for the last furnace, since the other one should be constantly filled with kelp and thus will never run out of kelp while the fuel is still going (unless you turn off the farm but that’s not really worth the trouble)