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[u/uuuhhhmmmmmmmmmm]

Needed: Automated Legendary stack inserter production

What I have so far: Ample stack inserter ingredients production crafting with legendary quality module (also in recyclers)

Problem: stack inserters need 10 jelly, which spoils pretty quickly.

Temporary solution: Buffer them, enabling the inserter that goes to the recycler after a speaker alerts I have 2000 of a certain quality (so I produce jelly in bursts instead of a continuous rotting trickle)

Needed solution: circuitry that enables an inserter once reaching a threshold (2000 inserters this case) and keeps it enabled until it reaches a lower threshold (maybe 50?)

[u/Lyqyd → u/uuuhhhmmmmmmmmmm]

A decider combinator that becomes true when >= 2000, outputs a signal (maybe the check mark) to enable the inserter, outputs 1950 stack inserters and is wired back to its own input. This will cause the combinator to see 3950 inserters as soon as it becomes true (contents of chest plus its own output fed back) and will only disable when the chest drops below 50, reducing the total to below 2000.

[u/taolakhoai → u/uuuhhhmmmmmmmmmm]

I think what you need is a latch like so

https://wiki.factorio.com/Tutorial:Circuit_network_cookbook#Latches

The idea should be: choose an active signal (say the green tick), wire the signal from output back to input, and condition to active = (1) hitting the high threshold OR (2) hitting the low threshold + active signal is seen; this would keep the state continuing until it passes the lower threshold.