#One minute timer full#

The real question is, how are you going to make sure the weather is good on the day you need to demonstrate the device? Of course, you should not look through the telescope, even with a filter. Half a pair of binoculars might work too, but the magnification may not be quite enough. A cheap department store telescope should be sufficient. And since it is magnified, it will be easy to measure the movement. Since it is a projected image and not a shadow, it will be very sharp. What you could do is use a telescope and project the image of the sun onto a piece of paper. The sun is not a point source, so you can’t get a perfectly sharp shadow - that limits the accuracy. I’m not sure just how sensitive, so you’d have to experiment.Ī sundial would be difficult.

The only problem is, viscosity is highly sensitive to temperature. Mark how far it moves in one minute and you’re done. Put the disk at the bottom of a cylindrical container and fill it with oil or water. My first thought was to put a string on a pulley, put a weight on one end and a disk with holes on the other. Might be good for an art class, but science is supposed to teach you to look for the simplest, most practical and most accurate solution given the constraints. I’m not a big fan of projects that encourage “creative” and unnecessarily complex solutions.

Teachers love bright colors so be sure to use lots of clear and colorful stuff wherever possible. Using the small clamp on the hose regulate the water flowing onto the sponge and by removing or adding weight to the cup gradually adjust the mechanism so that it takes 60 seconds of water flow to make the sponge heavy enough to tip the see-saw to the sponge side. Put pennies (or whatever) into the cup to weigh it down so the sponge is up in the air on the see-saw and the cup is down. Using a hot melt glue gun put a clear aquarium hose into this hole and seal it.Įlevate the water container above the see-saw. Take the clear plastic water container an drill or punch a very small hole in the bottom or side near the bottom. Screw or glue a small plastic cup (laundry detergent cup or similar) to other end of wood see-saw. Use rubber bands to affix sponge (wetted then thoroughly wrung out) to one end of wood see-saw. Plastic tubing (like aquarium air hose tubing)ĭrill hole in middle of wood and using coat hanger wire or similar make a pivot point and support in the middle so it see-saws and is elevated. Using 150 repeaters would work but would be absolutely enormous and resource costly, so I'm trying to avoid that.Īnd I'm not sure what you mean, I'm not familiar with ring counters.Sponge (large pack of identical new sponges) I'm just looking for the most simplistic way to go about setting this up. I'm not trying to exclude pistons or anything, but in general, most people don't have 150 repeaters laying around, and if they do, I doubt they'd really have much space for it, haha. Mainly, I'm looking for the most compact way to go about this. Your typical piston ring counter does not reset quickly, so that might be an issue. Every 20 pulses on the seconds ring a pulse could be generated to the minute ring. The clock pulses the seconds ring counter every 3 seconds. You could have a short clock say 3 seconds (would only take 4 repeaters). What is difficult to make in survival? Are you trying to avoid pistons, avoid repeaters, or what?Īnother way to count is a ring counter or shift register.Ī piston ring counter uses just normal pistons. They will be roughly equal in size added and let you count from 30 seconds to a little over an hour.

#One minute timer full#

If you wanted to time out a full hour you might do double the clock length from 18 3/4 to 37 1/2 repeaters and use a 7 bit counter. Each bit using this counter is about 3x3, so you can customize what you time to pretty easily. So 3 bit = 2 minutes, 4 bit = 4 minutes, 5 bit = 8 minutes. The counter shown is a little slow to carry ahead, so i would not add too many bits using this design.Įxtending this further with just that 15 second clock every bit you add to the counter doubles what you can count to. The counter auto loops back to 0 from 3, so you don't have to reset it. Since we have one torch in the clock we should have 18 full delay repeaters and one at 2 ticks and the one torch adds a tick.įalling edge detector on the counters output of 3 would give you a pulse every 60 seconds. An edge detector on a long pulse length clock will give us that with just 75 ticks in the clock (on for 75 ticks, off 75 ticks).ħ5 ticks / 4 per repeater = 18 and 3/4 repeaters. So to get to 600 ticks we need a pulse every 150 ticks. If you don't have access to cobwebs though here is the counter based system i mentioned:Ī 2 bit counter has 4 states. Cobwebs + minecarts is probably the simplest to set up.