Artificial Skin for Mobile Devices

Skin-On Interfaces are devices that augment existing devices with realistic skin

Human skin is the best interface for interaction. I propose this new paradigm in which interactive devices have their own artificial skin, thus enabling new forms of input gestures for end-users.

Skin-On Interfaces is a research project made by Marc Teyssier, Gilles Bailly, Catherine Pelachaud, Eric Lecolinet, Andrew Conn and Anne Roudaut.

This research was conducted at Bristol Interaction Group, in Bristol UK. Researchers are from Telecom ParisTech, HCI Sorbonne Université and CNRS.

What is the Skin-On Interfaces?

Skin-On Interfaces are sensitive skin-like input methods than can be added to existing devices to increase their capabilities.
When we interact with others, we use skin as interfaces. However the objects of mediated communication - such as the smartphone - still has a cold interface that doesn't allow natural interaction and input.
In this project, I wanted to make available the perfect human interface that is the skin for existing devices.

Reproducing the skin layers

I followed a bio-driven approach where I took inspiration from the human skin to design the perfect artificial skin.

Easy fabrication process for replication

The fabrication process is fairly simple and can be reproduced easily by other researches and HCI practitioners.

1. Creating the top textured layer. The epidermis layer is built by pouring DragonSkin silicone with beige pigments on a skin-like texture mold.

2. Positioning the electrodes. Once cured, the top layer is positioned on a pane, with the texture facing down. I used conductive threads (Datastretch) placed in a perpendicular grid on top of the artificial epidermis to form the electrodes.

3. Adding hypodermis. We prepare a rectangular mold of the size of the desired artificial skin and place it on top of the sensing layer. The hypodermis viscous silicone layer of Ecoflex Gel is poured inside the mold to reach the desired fat thickness, i.e. 10mm in this example.

4. Connecting electronics. The electrodes are then connected, i.e. they are soldered to the hardware sensing platform.

5. Shaping the Skin-On. To improve the visual appearance of the interface, the excess of silicone can be trimmed before being folded around the side of the hypodermis layer and glued with silicone glue. Paint or makeup can be added to shade the artificial skin with flesh like tonal variation, thus increasing anthropomorphism.

Failing

The fabrication process went through a lot of trial and errors, resulting sometimes

Open-Source and Open Hardware

I developed an Open Source and Open Hardware multitouch controller to enable DIY fabrication of multi-touch interfaces on unconventional surfaces such as human skin: The MuCa-Breakout.

The breakout is composed of a controller which allows for connecting 12 sensing electrodes and 21 transmitting electrodes. Any conductive electrode with an unusual shape or using unusual material can be used for sensing and transmitting. The touch controller can transmit the raw electrodes data or 5 multi-touch coordinates via i2C, to any micro-controller.