In CapNFC, the placement of electrodes within a smart is vital to the application performance. Therefore, we provide further examples of suitable electrode placements on that page.
The electrode placements depend strongly on the operating mode, further instructions can be found in a paper.
We applied the magnifying glass mainly for the use-case of enabling visually impaired people to interact naturally with a computer. Due to a large ground electrode, which is embedded in the magnifier's handle, it is possible to detect approaching hands when the object is placed near a receiver board. The transmit electrode is integrated into the magnifier's head. It is a simple small copper wire with a red isolation.
The airplane is actually a bit small for our tags, so we had to place one underneath the plane and use a lot of tape to attach the electrode. The plane has a ground electrode on top where the user touches the object. The transmit electrodes are attached to the bottom of both wings and allow for broadcasting the plane's inertial data.
We also implemented a Braille command card which can activate PC commands with a simple tap. In later stages, we aim at integrating the tag directly into the card. Right now, it is attached to its bottom with a connection to the transmit electrode. Using conductive copper tape, we attached the ground electrode to the edges of the Braille card.