The author describes their experience building a clock projector, which can project the time onto a ceiling at night. They explain that they chose a small LCD for the projector to keep costs down and make the device smaller. They also discuss the importance of the focal length and the use of a condenser lens to optimize the light output. The author includes information about the electronics construction and the custom-designed case for the projector. They also mention different lens variants they tried, including a C-Mount lens and a Sony E-Mount lens. Links to downloads and STL files are provided. No controversial or surprising information is present in the content. The author’s voice is informative and enthusiastic about their project.
https://microengineer.eu/2018/05/01/diy-night-clock-projector/