REDSTONEPEDIA › Circuits › Memory and counters
Counter: counts pulses and reacts on a set count
every 12th pulse · 17 blocks
The output's on/off pattern repeats every 12 input pulses: on for 6 of them, off for the other 6.
fits in 7×4×2
Every size 39
The best design for each size: pick one to see it.
| size | blocks | numbers |
|---|---|---|
| every 2nd | 3 blocks | |
| every 3rd | 11 blocks | |
| every 4th | 6 blocks | |
| every 5th | 19 blocks | |
| every 6th | 14 blocks | |
| every 7th | 25 blocks | |
| every 8th | 9 blocks | |
| every 9th | 23 blocks | |
| every 10th | 22 blocks | |
| every 11th | 23 blocks | |
| every 12th (this page) | 17 blocks | |
| every 13th | 23 blocks | |
| every 14th | 28 blocks | |
| every 15th | 23 blocks | |
| every 16th | 12 blocks | |
| every 17th | 23 blocks | |
| every 18th | 26 blocks | |
| every 19th | 23 blocks | |
| every 20th | 25 blocks | |
| every 21st | 23 blocks | |
| every 22nd | 23 blocks | |
| every 23rd | 23 blocks | |
| every 24th | 20 blocks | |
| every 25th | 23 blocks | |
| every 26th | 23 blocks | |
| every 27th | 23 blocks | |
| every 28th | 23 blocks | |
| every 30th | 23 blocks | |
| every 32nd | 15 blocks | |
| every 33rd | 23 blocks | |
| every 34th | 23 blocks | |
| every 36th | 29 blocks | |
| every 38th | 23 blocks | |
| every 39th | 23 blocks | |
| every 40th | 28 blocks | |
| every 45th | 23 blocks | |
| every 48th | 23 blocks | |
| every 100th | 23 blocks | |
| every 576th | 23 blocks |
Try it
Hold IN under the view for a long press, tap it for a short one: tap it 12 times and OUT goes through one on-off cycle (the box marked OUT turns red while the output is on). Press play under the view to watch a demo on a loop; touch any other control to take over. Its count is the number of items in its droppers: they pass the items one way per pulse, and the numbers over them show how many each holds. Load another number of items (stone here) to make it react on that count.
Build it
Download .litematic Download the design as text
The .litematic opens in Litematica (Minecraft 26.3): every block of the design in one region. The text file is the same build written as plain text, block by block.
Comes loaded with 1 stone in its containers: the download includes it; building it by hand, put it in first.
Blocks used: comparator copper bulb dropper glass hopper stone
Details: how it works, measurements and properties
In depth
It counts input pulses: the output's state repeats every 12 input pulses: after each pulse it is on for 6 of them and off for the other 6. In other words, it divides the number of pulses by 12.
Use it to do something every 12th time, or to slow a fast clock down 12 times.
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 redstone lamp in that cell (the view adds it to show the output) lights 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 2250 ticks (1 min 52.5 s).
Step by step (49 lines)
pulse 1: output 1 (level 15) pulse 2: output 1 (level 15) pulse 3: output 1 (level 15) pulse 4: output 1 (level 15) pulse 5: output 1 (level 15) pulse 6: output 0 (level 0), changed pulse 7: output 0 (level 0) pulse 8: output 0 (level 0) pulse 9: output 0 (level 0) pulse 10: output 0 (level 0) pulse 11: output 0 (level 0) pulse 12: output 1 (level 15), changed pulse 13: output 1 (level 15) pulse 14: output 1 (level 15) pulse 15: output 1 (level 15) pulse 16: output 1 (level 15) pulse 17: output 1 (level 15) pulse 18: output 0 (level 0), changed pulse 19: output 0 (level 0) pulse 20: output 0 (level 0) pulse 21: output 0 (level 0) pulse 22: output 0 (level 0) pulse 23: output 0 (level 0) pulse 24: output 1 (level 15), changed pulse 25: output 1 (level 15) pulse 26: output 1 (level 15) pulse 27: output 1 (level 15) pulse 28: output 1 (level 15) pulse 29: output 1 (level 15) pulse 30: output 0 (level 0), changed pulse 31: output 0 (level 0) pulse 32: output 0 (level 0) pulse 33: output 0 (level 0) pulse 34: output 0 (level 0) pulse 35: output 0 (level 0) pulse 36: output 1 (level 15), changed pulse 37: output 1 (level 15) press 1 20: output 1 (level 15) press 2 30: output 1 (level 15) press 3 200: output 1 (level 15) press 4 20: output 1 (level 15) press 5 30: output 0 (level 0), changed press 6 20: output 0 (level 0) press 7 30: output 0 (level 0) press 8 20: output 0 (level 0) press 9 20: output 0 (level 0) press 10 30: output 0 (level 0) press 11 200: output 1 (level 15), changed press 12 20: output 1 (level 15)
Measurements
| metric | value | what it means |
|---|---|---|
| N | 12 | how many input pulses one output cycle takes |
| output | level every 12 pulses | how the output shows the count: toggles (flips every N), pulses (one pulse every N) or level (its state repeats every N) |
| counts | one pulse per N | |
| on | 6 of 12 |
Properties
| Study | Memory and counters |
|---|---|
| Kind | Counter: counts pulses and reacts on a set count |
| Blocks placed | 17 (not counting the input levers or buttons and the lamp the view adds) |
| Box | 7×4×2 (56 blocks of space) |
| Made of (the blocks that change state) | comparator, copper bulb, dropper, hopper |
| Inputs / outputs | IN (repeater) / OUT |
| Design file | counter12-ring3-bulb2-sealed |
The design file
Design file (31 lines)
# Counter: every 12th pulse · 17 blocks
# https://vjeux.github.io/redstonepedia/circuits/memory/counter12-ring3-bulb2-sealed.html
name: counter12-ring3-bulb2-sealed
circuit: counter 12
port input: 0 0 0
port output: -7 0 0
nbt: -1 0 0 {Items:[{Slot:0b,id:"minecraft:stone",count:1}]}
origin: -6 0 -1
palette:
A minecraft:dropper[facing=west,triggered=false]
B minecraft:hopper[enabled=true,facing=south]
C minecraft:comparator[facing=east,mode=compare,powered=false]
D minecraft:dropper[facing=north,triggered=false]
G minecraft:glass
H minecraft:hopper[enabled=true,facing=down]
S minecraft:stone
W minecraft:waxed_copper_bulb[lit=false,powered=false]
d minecraft:dropper[facing=up,triggered=false]
h minecraft:hopper[enabled=true,facing=east]
layer -1:
.
S.S.S
layer 0:
.....hd
CWCWCD
layer 1:
.....GB
.....HA
layer 2:
......G
.....G