(Real) Stargate built in backyard

PVC, wood, and some creativity bring this Stargate duplicate to life. [Mango] and his father started with AutoCad drawings taped together, and ended with the Stargate you see before you. Sure it’s not 22 foot in diameter and not made of Naquadah, but its inner ring rotates and dials like the real thing and it has all 39 symbols – hand carved. Catch a fun and entertaining video with the Stargate after the break.

[via SciFiWire]

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Build a foam machine

Spice up your next house party with this diy foam machine. [Stephen Martin] posted his PDF plans for version 1 and version 2 of the device. It seems the deciding factor on the machine is the type of fabric screen used to create the suds from a bubble bath liquid. This is the reason he’s got two versions. They share a lot of the same components (especially the expensive ones) but the first version is easy to swap out different fabrics and the second is a more permanent installation. In the end, we’re looking at a sump pump feeding foam to a fabric net that is attached to a blower. This will be a nice addition to that fog machine you built last fall.

Two input devices made with common items

Here’s two input devices you can easily build with materials you already have on hand.

To the left, [John] built a 3×3 keypad matrix from paper and tinfoil. The rows and columns are made up of strips of tin foil on the front and back layers of paper. The layers are separated by spongy double-stick tape. A ‘keypress’ results when the gap between the conductors is compressed with your finger.

In much the same way, [Dave Fletcher] built a touch potentiometer. He made two resistance plates by scribbling pencil lead on sheets of paper. When the two plates face each other, separated by the same type of foam tape as before, they can be pressed together to form a circuit with a variable resistance. This results in a crude version of the SparkFun softpot.