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Turn a Wall into a Touch Screen Cheap

Hi, I’m Scientific American podcast editor Steve Mirsky.

And here’s a short piece from the July 2018 issue of the magazine, in the section called Advances: Dispatches from the Frontiers of Science, Technology and Medicine.

Smart walls by Croce Patel, the right pain can add presents to your walls know we can also make them smarter researchers recently converted a wall into an outsize trackpad and motion sensor by using low-cost conductive paint to a large grid of electrodes such as smart wall can since human touch and track gestures from a short distance.

It can also detect the locations of appliances and whether they switched on the technology could someday turn on lights. When a person enters a room, track a player’s motion in an interactive video game or monitor a child’s television use.

Young John the computer science doctoral student at Carnegie Mellon University helped to create the concept to create the high-tech surface. Zhang and his colleagues applied painters tape in a lattice pattern to a 12 x 8’ wall then coded it with commercially available conductive nickel paint.

Removing the tape left a pattern of diamond-shaped electrodes, which the researchers connected using a grid of thin copper tape strips they have fixed a vinyl sticker in the middle of each diamond to insulate the electrodes from one another.

Finally they wired the strips to a custom-built circuit board and cover the wall with standard latex paint the entire project took four hours and cost less than $200.

Zhang and his colleagues at Disney research presented the wall at the CH I conference on human factors in computing systems in Montréal.

In tracking of touch or gesture. The wall functions similarly to a smart phone screen. The circuit board prompts the electrodes to omit an electric field when a person’s body intercepts this field, it triggers a measurable change in current at the nearby electrodes in the walls appliance detection mode, the power is turned off and the electrodes act as an antenna to passively pick up electromagnetic waves emitted by nearby devices.

The researchers detected iPads up to 6 1/2 feet from the wall fans and floor lamps could be sensed from about 10 feet. That was smart walls by Croce Patel.