The iHelmet: An AR-enhanced Wearable Display for BIM Information - Mobile and Pervasive Computing in Construction - page 156

Figure 8.3 The Optoma PK101
A platformwas fixed to the inside the helmet to hold the projector inside the helmet
without disturbing the user. To avoid sliding, an acrylic sheet was used to fix the
projector (Figure 8.4b). An electric wire connected the iPod Touch with the
projector (Figure 8.4c).
Figure 8.4 Hardware settings of the iHelmet: (a) a small holder frame and aperture on the outside of
the helmet; (b) b platform and an acrylic sheet inside the helmet; (c) a data cable to connect the
mobile device to the projector