For users who miss the vintage Magic Screen game, there are applications that mimic it well. But rotating virtual pens on a tablet screen is not at all the same as rotating real, physical pens. Two identical homemade by Instructables under the nickname Pnmelville are attached to the tablet screen in the right places using suction cups. The handles rotate freely around the axis of the suction cups, while the foil moves electrically connected to the user's palm on the screen. This simulates the rotation of a virtual pen with your finger. Then the handles on the suction cups can be removed. Such fixtures compatible with any mobile applications where there are virtual rotary handles. They can be made and more than two, if the application has a lot of such pens.
The master takes the foil (for some reason he calls it tin, although it has long been aluminum), a non-scratching sponge for washing dishes, a drinking straw, two bottle caps and two “arrows” on the suction cups from the Nerf toy. It is necessary that under the foam of each of the “arrows” there should be a pin with an outer diameter slightly smaller than the inner diameter of the straws. By the way, if you have accumulated a lot of bottle caps, you can turn them in at collection points, whose addresses in large cities are easy to find on the net. In some of them, you will be paid the cost of these caps, in others they will send the proceeds from their smelting to new plastic products for charity.
Tools for the manufacture of the structure will require very little - just scissors and a glue gun. The master cuts two tubes from a straw, the length of each of which is slightly less than the height of the lid. The translator did not know that 3M produces scissors.
The master glues each of the tubes into the center of the cap:
Glue foil strips to the covers as shown in the following photo. In order not to burn your fingers on hot-melt adhesive, you can press the foil inward with a toothpick. Hot glue should not get onto the surface of the foil facing out, otherwise it will not make sense - it is used here as a conductor.
The master glues one more strip of foil to the covers, perpendicular to the first and electrically connected to it. Otherwise, the capacity of the foil alone will not be enough, and so - the user will also add his own, and the touch screen is designed just for that.
The contact area of the foil with the display is small, so the master increases it with a piece of non-scratching sponge.Apparently, she is ... well, not quite a dielectric, since everything worked with her. The master arranges this piece of the sponge so that it contacts the foil, and glues it from below. Glue between the foil and the sponge is unacceptable - this will disrupt their electrical contact. To prevent the lid from distorting, the master fills the remaining space with additional pieces of sponge, which also sticks, but so that they do not touch the first piece. Then their capacity will be too small, because the user is not connected to them, and the screen will not respond to them. And on the first - will be.
The master completes the “arrows” from the Nerf toy: removes excess rubber from the suction cup so as not to interfere with a piece of sponge touching the screen, and also removes the foam under which each of the “arrows” has a pin:
Launches an application on the tablet that simulates the Magic Screen toy, and it displays on the screen including a frame and pens. In the center of each of the virtual pens, the master places a modified suction cup from the "arrow":
Installs previously made handles from the covers on the “arrows” so that the pins of the suction cups are inside the tubes glued to the covers:
Homemade products are ready to go. Do not use water when attaching suction cups, or metal objects when removing them. It is convenient to remove the suction cups with a sharpened wooden stick of ice cream - it will not scratch the screen.