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  • Resistors Class - Draw Resistors Using a Pencil (Suggested Experiments Included)

    So, this didn't work. But, having done this years ago, I knew it should work. One can even make a long resistor and then use a NE555 to make a musical instrument. So, some testing: Out of six different pencils (all #2 HB) only one produced a barely working resistor. Then I changed the paper. Instead of smooth copier/laser printer paper I used cheap notebook filler paper. Suddenly, half the pencils produced measurable results, one of them now a decent resistor. Result: 1. Paper makes a difference. The smooth low-jam copier paper is probably coated and not abrasive enough. Cheaper paper or maybe even brown packing paper is probably the better choice. 2. Pencils make a difference. Even within the same hardness and brand. (Dixon #2 HB, was much more conductive than Dixon Ticonderoga #2 HB). A…

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    So, this didn't work. But, having done this years ago, I knew it should work. One can even make a long resistor and then use a NE555 to make a musical instrument. So, some testing: Out of six different pencils (all #2 HB) only one produced a barely working resistor. Then I changed the paper. Instead of smooth copier/laser printer paper I used cheap notebook filler paper. Suddenly, half the pencils produced measurable results, one of them now a decent resistor. Result: 1. Paper makes a difference. The smooth low-jam copier paper is probably coated and not abrasive enough. Cheaper paper or maybe even brown packing paper is probably the better choice. 2. Pencils make a difference. Even within the same hardness and brand. (Dixon #2 HB, was much more conductive than Dixon Ticonderoga #2 HB). And if I had to set it up for kids, I'd go with 2B rather than with HB.

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  • Arduino Plant Watering System

    Careful where you place that glass of water. If you have a cheap impeller pump, water might continue to flow even after the pump is off. The water glass should be slightly lower than the plant. Otherwise the pump will start the flow and the siphon will empty the rest of the container into the plant.

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  • tantris commented on Sunyecz22's instructable Smart Indoor Herb Garden
    Smart Indoor Herb Garden

    From what I read, the main reason for the corrosion is that the sensors are constantly running a small DC current through the soil and you are basically dissolving one of the plates. So, one idea to try before you get new sensors: Power the sensors only when needed. I would disconnect the line that runs from V+ to the sensors and put a cheap npn-transistor in between, the base of the transistor (with a pull down resistor) goes to a spare arduino I/O, the sensor "enable" pin. In soilCheck(), you first enable the sensors, maybe wait a ms, read sensors, disable sensors. As long as you don't call soilCheck() constantly this should really minimize the current and the corrosion.

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  • Rubber Bound - a Game With Rubber Bands

    Second that. Could also just be a separate wooden block as a peg holder with wholes for the captured pegs. Some of the rules could this way be built into the games (e.g. you can capture pegs as long as there is room in your holder...)This game certainly deserves to be built and tried out on a game night with multiple groups to give feedback.

    I like the idea with the grooves, would work in wood as well.Steel pins? I would prefer wood.But, that probably depends whether the audience is "tech" people (steel) or "wholesome" wooden toys people. Dark-stained hard wood dowels, or shiny metal...?

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  • Additional pictures on how to do the mitered corners: https://blog.colettehq.com/tutorials/how-to-sew-a-mitered-corner

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  • tantris commented on Ryan110's instructable A Sociable Bicycle

    You could try an uneven build, so that the wheels aren't in the middle, but so that each rider has the same momentum (weight x distance).

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  • I was thinking of a wood-block circuit project for kids. I like the block idea because connecting blocks are not only cheaper than little bits they more intuitively show that you are building a "circuit"! I like your copper tape idea, it makes it feel electrical.. The magnets: I would get rid of the side magnets, make the blocks wider and add two magnets on each end, mounted with opposite polarity. (let's say, left is always N, right is S). This way, blocks can be turned around and always connect. (Important for diodes). Of course one wouldn't need to get rid of the side magnets, just make them pairs of two as well. But I think it would be cheaper to add branch pieces: 3-way T and 4-way X connectors for branching. If one adds straight circuit pieces (wire only), the branch …

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    I was thinking of a wood-block circuit project for kids. I like the block idea because connecting blocks are not only cheaper than little bits they more intuitively show that you are building a "circuit"! I like your copper tape idea, it makes it feel electrical.. The magnets: I would get rid of the side magnets, make the blocks wider and add two magnets on each end, mounted with opposite polarity. (let's say, left is always N, right is S). This way, blocks can be turned around and always connect. (Important for diodes). Of course one wouldn't need to get rid of the side magnets, just make them pairs of two as well. But I think it would be cheaper to add branch pieces: 3-way T and 4-way X connectors for branching. If one adds straight circuit pieces (wire only), the branch pieces could simply be steel covered in copper tape, no magnets.

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  • This probably would not work for woodworking. The tools in this setup (plotter. 3d-printer, laser) put very little stress on the mechanical setup (motor, belts, bearings, rails), so one can "get away" with reusing scanner parts.

    This probably would not work for woodworking. The tools in this setup (plotter. 3d-printer, laser) put very little stress on the mechanical setup (motor, belts, bearings, rails), so one can "get away" with reusing scanner parts.

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