Need help salvaging projector from alarm clock


Thanks in advance for your help. I came across this old alarm clock in a thrift store for $4. It has a projector to show the time on the wall or ceiling. I’d like to remove the projector and drive it through Arduino to display scrolling text, but I think I may be in over my head.

I’ve attached some pictures showing the assembled and disassembled alarm clock, the projected image, and a close-up of the PCB text next to the projector connector (labeled left-to-right: G, L+, L-, 1.5, M, H, T1).

Another piece of information I have is the alarm clock is run using Silan Semiconductors SC8560. See below for link to spec.\S\SILAN\SC\SC8560AY.pdf

I’m not sure what my next steps are. Can anyone advise? I’d like to know the following:

  • What do the cryptic letters next to the connector mean? I’m assuming “G” is ground and “1.5” is 1.5V?
  • I’d like to project scrolling text. Is this even possible?
  • Can I power the projector through Arduino or will I need an outside power supply?
  • What additional circuitry would I need to accomplish item 2?
  • How do I tell the projector what text to display?

Thanks, I’m sure I’ll have more questions once I dig deeper. So you understand my experience level, I’ve completed projects 1 - 11 in the Arduino starter kit and have almost finished an autonomous, light-seeking RC car with ultra-sonic sensor to avoid head-on collisions (just trying to fine-tune the code).

Alarm Clock Pictures.pdf (753 KB)

Scrolling text? How you you propose to view that on a 3½ digit/ 7 segment alarm clock display?

OK, the display is pretty standard, but the projector is a different ball game. We would need to see the insides of the projector to know anything about it.

3 letters at a time, many are possible: A, b, c, C, d, E, F, g, h, H, i, I, j, J, L, n, o, O, P, S, T (sort of), u, U, Y and 0,1,2,3,4,5,6,7,8,9

Thanks for the replies! See attached for teardown of the projector. I would have provided in my original post, but I’ve gotten myself in trouble before breaking things down too fast.

I noticed the projector PCB has an IC on it (markings near the IC say “AV-663-4”, but a google search didn’t reveal a datasheet). It also has two 104 capacitors, an LED, display and a cylindrical component which is foreign to me.

Any ideas how to drive the display?


Projector Teardown.pdf (1.17 MB)

ReadySetGo: Any ideas how to drive the display?

Not without a lot more information! A full circuit diagram of both parts at least.