Summary

This is a remix of a brilliant NTP-based projection clock by crisspen.

I just needed something that points at the ceiling and provides perfect time. I didn't alter the electronics or software, which is available here. Okay, I altered the software slightly since it seemed to be having trouble saving WiFi credentials, but I really just hardcoded my credentials. The credentials weren't storing properly on my hardware, so I made some fixes, available here.

The original design has been simplified into a pretty straightforward tube. You'll need the original lens holder (which I didn't redesign, but probably should have) and that's it. I cleaned up the lens holder a bit, and it's now included. The simple base and housing is enough to point it directly at the ceiling.

The spacer collar fits between the lens and the housing. The simplest thing to do is get everything else done and printed first, then hold the lens over the working base until you're happy with the focus, then measure the distance from the bottom of the lens housing to the top of the base. Put this in mm into the "spacer_h" variable in SCAD and that's it.

A few notes:

• M2 screws work pretty well for the mounting. I used M2x4's to mount the electronics to the housing and M2x16's for the lens mount.
• I bought the yellow LED, which is fairly neutral on the ceiling (pictured.) I didn't want to light up the room at night.
• I used wire cutters to cut the lens out of its original mount from the top, being careful to leave the ring between the two lenses intact. There is probably a simpler way to do this.