Video game controllers have come a long way from the days when a vibration motor was enough to make the action in the game feel real. Modern controllers can simulate everything from the recoil of a gun to the resistance of pulling a bowstring — but there‘s still something missing. They can’t reproduce the finer details of touching and handling objects in a virtual world. Researchers from Hunan University and the Chinese Academy of Sciences are looking to change that withElectroPad, a modified PlayStation 5 controller that makes virtual objects feel more realistic.
ElectroPad uses a technique called electrotactile stimulation. By sending carefully controlled electrical pulses through electrodes in contact with the skin, it can create localized sensations that mimic textures, edges, and shapes. The idea is to let players feel the surface of a virtual object as their character interacts with it, rather than simply experiencing a generic vibration.
To make this possible, the researchers developed a pair of custom covers that fit over the handles of Sony’s DualSense controller. Each cover is just 2 millimeters thick but contains 190 individually addressable electrodes, giving the complete controller an impressive 380 stimulation points.
Sensations are simulated with electrical stimulation (📷: W. Li et al.)
The electrodes are arranged to match the areas where players naturally grip the controller. Smaller, 2-millimeter electrodes are concentrated around the fingers, while larger, 4-millimeter electrodes cover portions of the palms. The covers themselves are fabricated using dual-material 3D printing, combining conductive and nonconductive PLA with flexible printed circuits underneath.
Of course, having hundreds of electrodes is only useful if the system knows which ones to activate. ElectroPad handles this through a calibration process that maps the player’s actual hand contact points to corresponding locations on a virtual hand in Unity. As that virtual hand touches or moves across an object, the appropriate electrodes fire in sequence, creating the sensation of contact moving across the skin.
This allows ElectroPad to simulate three different types of interaction: sliding fingers across textured surfaces, tracing the contours of objects, and grasping or rotating objects to explore their overall shapes. The researchers demonstrated these capabilities using virtual items including a guitar, knife, book, cup, and diamond.
To evaluate the system, the team conducted two user studies. In the first, 12 participants tested how accurately they could perceive different textures and shapes using electrical stimulation alone. Recognition accuracy reached 80% for surface patterns, 86% for contours, and 89% for object shapes.
A second study involving 12 participants explored how the technology affected gameplay. Across 24 virtual interactions, participants reported significantly greater enjoyment and immersion with ElectroPad enabled than with visual feedback alone.
There is still a lot of work to be done before ElectroPad makes its way into real-world applications. The prototype requires external control electronics, and the researchers identified inconsistencies in sensation across different parts of the hand. Still, the results show that future controllers could do a lot more than shake and resist button presses. They might actually let you feel what your character is touching.
haptic
user interface
games
Nick BildR&D, creativity, and building the next big thing you never knew you wanted are my specialties.
