128-tick pulse · 13 blocks

How to try it

Press play under the view to watch the demo on a loop (the badge reads demo with the step it is on; the same sequence is drawn as a timing diagram below). Touch any control to stop it and try the circuit yourself.

To try it: press and hold the IN button of the bar (or the cell tagged IN) to power that input; a quick tap sends a short 2-tick pulse.

Inputs are tagged in lime; the output is tagged OUT: the orange glass marker next to it glows while the output is on (the output strip by the demo badge shows its last 40 game ticks, 2 seconds). Drag to look around, pinch or scroll to zoom, step one game tick at a time with the step button.

Inputs and output over time

The input follows this schedule (the 3D view's demo plays the same). Lime: an input is on; orange: the output is on (taller = a stronger signal, 1 to 15). Time runs left to right in game ticks (20 ticks = 1 s).

Swipe the diagram sideways: the whole sequence lasts 6813 ticks (5 min 40.65 s).

in  2 ticks (0.1 s): no output  <- not handled
in  3 ticks (0.15 s): +9 for 128
in  4 ticks (0.2 s): no output  <- not handled
in  5 ticks (0.25 s): no output  <- not handled
in  6 ticks (0.3 s): +12 for 128
in  8 ticks (0.4 s): +14 for 128
in 10 ticks (0.5 s): +16 for 128
in 15 ticks (0.75 s): +21 for 128
in 20 ticks (1 s): +26 for 128
in 30 ticks (1.5 s): +36 for 128
in 40 ticks (2 s): +46 for 128
in 60 ticks (3 s): +66 for 128
in 80 ticks (4 s): +86 for 128
in 120 ticks (6 s): +126 for 128
in 160 ticks (8 s): +166 for 128
in 240 ticks (12 s): +246 for 128
in 320 ticks (16 s): +326 for 128
in 480 ticks (24 s): +486 for 128

Measurements

Notes from its designer

One pulse of exactly 8 ticks per item in the first hopper (8 ticks to 24 seconds) every time the input turns OFF, always 13 blocks: a copper bulb remembers the falling edge (the input makes a piston lift an observer away from the bulb, and when it turns off the piston pulls the observer back beside the bulb, where it fires once); while the bulb is lit, its comparator locks the second hopper and unlocks the first, so the items pass one by one; when the first hopper is empty, its comparator goes off and a torch toggles the bulb off; then the items flow back. This one holds 4 items: 32 ticks. Detail: the bulb's comparator powers the stone above the second hopper (locking it) and turns off the torch on that stone, which locked the first hopper; the first hopper's comparator powers the block whose torch lights the bulb from below when that hopper empties.

Properties

The design file

on GitHub

# One pulse when switched off: 128-tick pulse · 13 blocks
# https://vjeux.github.io/redstonepedia/circuits/pulse/pulse-fall-hopper-oneshot-L128.html
name: pulse-fall-hopper-oneshot-L128
circuit: falling-edge
origin: 0 0 0
port input: 2 4 2
port output: 1 2 1
palette:
  G minecraft:stone
  S minecraft:hopper[enabled=false,facing=east]
  U minecraft:hopper[enabled=true,facing=west]
  C minecraft:comparator[facing=north,mode=compare,powered=true]
  F minecraft:stone
  Y minecraft:stone
  T minecraft:redstone_wall_torch[facing=east,lit=false]
  W minecraft:redstone_wall_torch[facing=west,lit=true]
  X minecraft:stone
  K minecraft:comparator[facing=south,mode=compare,powered=false]
  B minecraft:waxed_copper_bulb[lit=false,powered=false]
  O minecraft:observer[facing=east,powered=false]
  P minecraft:sticky_piston[extended=false,facing=down]
layer 0:
  ...
  G..
  ...
layer 1:
  SU.
  CF.
  YT.
layer 2:
  WX.
  .K.
  .BO
layer 3:
  ...
  ...
  ..P
nbt: 0 1 0 {Items:[{Slot:0b,id:"minecraft:cobblestone",count:16}]}