![]() ![]() With the design you show, (4 hoppers in a circle) you can calculate the number of items needed by (1.6 * items) + 0.4 = seconds. ![]() I did some in-game testing, and came up with 30 seconds, and it comes out to being about 15 on, 15 off. For more measuring and time resources click here. Lots of choice of level, including: adding 1 hour, multiples of 5, or 10 minutes or adding multiples of a quarter of an hour. Find the correct time on an anologue or digital clock. Doing the math gives a magic number of 18,5 items, so we'll use 19 and call it close enough. Read the time on either an analogue or digital clock and then answer a word problem involving adding a given time. So assume only one hopper output is "on", and you want a signal of any length every 30 seconds. So the formula for this one is 1.6 * items + 0.4 seconds per full-cycle. The design you show runs on the same principles, but with a repeater for each part-cycle, adding 1 redstone tick (0.1 second) per part-cycle. So if you want a pulse every 8 seconds, you need 10 items. So with Etho's design, the formula for the number of items is 0.8 * items = seconds. Hoppers transfer items at a rate of 0.4 seconds per item, which means 0.4 seconds per item per half-cycle (0.4 seconds with the redstone block in one position, 0.4 seconds in the other). But the same mathematical principles apply to this design too. Unfortunately, unlike the other design, this one is not completely silent there's a piston pulse every cycle of the timer. (there's no hidden redstone and both pistons are sticky, and the hoppers are facing into each other) The primary design I use for a configurable timer (as of Minecraft 1.5) is Etho's hopper clock. ![]()
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