The exploration of a collaborative sketching interface starts with the examination of various signals and movements intrinsic to act of architectural sketching.
Acceleration, and Rotation(Angle Rate sensor/Gyro)
EMG(Muscle electrical pulses analogous to muscle activity)
GSR(electrical signals in skin, sweat/resistance, and general arousal or excitement readings)
Pressure/Load(pens pressure against surface)
Electrode Placement: EMG was tested briefly to test feasibility of electrode placement on the hand and its sensitivity during drawing. Gripping a pen analogue in various positions generated different signals but the range of signal was very low and because of this, the data was noisy. The forearm might be a more reliable placement for electrodes to get cleaner data. The signals were repeatable though, only when directly pushing on the electrodes and changing their connection to the skin did the data change levels.
The Bicep was also tested and the range of data was much clearer, from 1 – 5 volts of range.
The design of a wearable for drawing should integrate an aesthetic conveying its function, hold a suitable number of sensors and feedback devices (namely haptic). Material selection would be a somewhat elastic rubber, capable of holding sensors against the skin and supporting its own cast shape.