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5.0Big Screen II transmits, and optionally records, live video from the camera to a second screen connected by AirPlay. The controls are not mirrored to the second screen or the recording. App includes a link to instructions for a DIY document camera for videoconferencing lectures and office hours from home. - Front or back camera - Landscape or portrait orientation - Records video and audio - Supports camera zooming - Tap to focus; Double tap to autofocus - Adjust exposure by sliding after focus - Triple tap suppresses Airplay warning - Can use as a document or demo camera - Video recording: 1280 x 720 px with HEVC (if supported) or H.264 compression Big Screen II is part of a digital whiteboard developed in the Hines Lab in the Dept. of Chemistry and Chemical Biology at Cornell University. The lecturer faces the classroom and writes on a sheet of illuminated glass with a fluorescent pen. The front-facing camera on the iPad behind the glass captures a video of the lecturer and his/her drawings and writing. Because the front camera flips the image horizontally, the lecturer’s writing is not reversed. Unlike a traditional white board, the lecturer cannot obstruct the writing. A full description of the whiteboard and instructions for its construction are given in E. S. Skibinski, W. J. I. DeBenedetti, A. G. Ortoll-Bloch, and M. A. Hines, “A Blackboard for the 21st Century: An Inexpensive Light Board Projection System for Classroom Use,” J. Chem. Educ. 92, 1754 (2015). Instructions for constructing the digital whiteboard can be downloaded using a link provided in the app or from the supplemental information of the J. Chem. Educ. article listed above. A big thanks goes to Kirby Turner of White Peak Software, Inc. who wrote the original Big Screen and who graciously shared his source code. Big Screen II is a de novo rewrite of Big Screen with added videorecording capability. All bugs are mine. Development of the digital whiteboard was supported by the National Science Foundation under Award CHE-1708025.
