Start the clock by turning off the input. The torch will turn on, the dropper will drop an item on the pressure plate turning the torch off. After 5 minutes, the item will despawn (disappear) and the pressure plate will deactivate, allowing the torch to turn on, causing the dropper to eject another item onto the pressure plate.
If completely filled with items, the dropper will need to be re-filled every 48 hours, or continually supplied with items from a hopper pipe. Two chickens constrained above a hopper can keep a dropper despawn clock supplied with eggs indefinitely.
Variations: Longer clock periods can be achieved by chaining multiple despawn clocks together, so that each torch triggers the next dropper instead of its own. When chaining multiple despawn clocks, the dropper must be placed so that it is activated only by the previous torch and not the previous pressure plate.
A dispenser can also be used, instead of a dropper, but is slightly more resource-expensive (and not advised with use of eggs).
How many repeaters, all on 4 ticks, would i need to make a redstone clock that will activate something, every 5 minutes or so?
Just do quick calculation; When (x) is #minutes, (y) is #tick-in-(x)minutes and (z) is #repeater:
10 ticks = 1sec, 1min = 60 sec = 600 ticks x (x) = (y)/4 = (z) repeaters
Hoping I help you
Check out a despawn clock. Uses dropped items despawning every 5 minutes to run it.
A despawn clock uses item despawn timing to create a clock signal.
Simply approaching a despawn clock can interfere with its timing, because any player might accidentally pick up the despawning item.
Dropper Despawn Clock
Dropper Despawn Clock
Additional blocks are required on each side of the pressure plate. The dropper is filled with items.3×3×2 (18 block volume)
clock output: 5 minutes off, 3-7 ticks on
Start the clock by turning off the input. The torch will turn on, the dropper will drop an item on the pressure plate turning the torch off. After 5 minutes, the item will despawn (disappear) and the pressure plate will deactivate, allowing the torch to turn on, causing the dropper to eject another item onto the pressure plate.
If completely filled with items, the dropper will need to be re-filled every 48 hours, or continually supplied with items from a hopper pipe. Two chickens constrained above a hopper can keep a dropper despawn clock supplied with eggs indefinitely.
Variations: Longer clock periods can be achieved by chaining multiple despawn clocks together, so that each torch triggers the next dropper instead of its own. When chaining multiple despawn clocks, the dropper must be placed so that it is activated only by the previous torch and not the previous pressure plate.
A dispenser can also be used, instead of a dropper, but is slightly more resource-expensive (and not advised with use of eggs).
Source: http://minecraft.gamepedia.com/Clock_circuit
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I would have, but i didnt know how many ticks is one second. And, plus I hate algebra.
It's already write= 10 ticks = 1 sec
So to calculate how much repeater you must have to 5 minutes is: 600 ticks [multiply by] 5[minutes] // [all that divide by] 4 = 750 repeaters
The rule for that is: y= (minutes or seconds) [multiply by] (600ticks or 10ticks) [divide by] 4