thanks for your fast reply.
Maybe I should explain a lil bit more.
A friend asked me to make a programmable timer without having to program... At a certain (programmable !) time a lamp (or whatever) comes on, after another certain(programmable) time the lamp goes of, ... on ....off etc. For us "Arduino-ers" it would be easy: make an array, fill in the (new) times, shoot it in the Arduino, and run. But my friend doesn't want to go into "(re)programming" an Arduino. I could write a program on the arduino with keypads, displays etc, but this would make it more complicated than necessary.
BUT... My friend is a video editor, so she can make video's. If she makes a video that displays a white screen, the lamp (or whatever) comes on, when her video displays a black screen, the "lamp" goes out. Being a video editor, she can put her white screens wherever she wants on her timeline. The (B/W, 128 x 64pix) video file that she can make on her computer will go on an SD card, and this SD card will be read and displayed by an Arduino on a small (e.g.128x64pix) LCD. An LDR (light depend resistor) in front of the LCD will "see" black or white and triggers a relay, SSR or whatever.
So actually, she will use her video editor program to "program" the timer.
The Arduino video player does not have to work hard because
- it only has to play a video file and do nothing else.
The "info" from the LDR doesn't have to go back in the Arduino. A relay or SSR connected to the LDR will switch things on or off.
- the frame rate can be very low (have to find out the lowest frame rate her video editor program can produce... -> in theory 1or 2 fps would be already enough !)
- it's only full 128 x 64 white or full 128 x 64 black
- the display won't be seen (it will be built in the box) and serves only to shine on an LDR.
Once this simple system works, we might try to stick 2 (or more) LDR's on the screen and have a video file where each half (quarter of the screen "shines (or not) " one of the LDRs... and thus operate 2 (or more) channels.
e.g with 4 "channels" : a white square top-left on the screen operates the green light, top-right a blue light, bottom-left = red, bottom-right = yellow... or of course any combination ...
I hope I was clear, (if not : ask more !) and again thanks for your interest !