Wearable computer comprises of a computer built within an ordinary clothing. This transformation allows it to be worn constantly, with the goal of becoming a seamless extension of body and mind. Equipped with various sensors which measure heart rate, respiration, footstep rate etc, the apparatus can function as a personal safety device for reducing crime, as well as personal health monitor for improving health care by encouraging individuals to take an active role in diagnosis and body maintenance. The ‘wearable computer’ apparatus is embedded within nontransparent clothing which provides shielding. Electronic circuits are built entirely out of textiles to distribute data and power and perform touch sensing. These circuits are passive components sewn from conductive yarns as well as conventional components to create interactive electronic devices, such as musical keyboards and graphic input surfaces.