:shock: No way! I have been thinking about doing a project just like this. :lol: Hmm... I suppose I can share what I have figured out with you :wink: :
Light sensor: The light sensor should just be a CDS cell in front of the window.
Blind sensors: For these, I was going to do an IR "end-sensor" kind of thing. I would have some sort of U-shaped bracket, mounted to the wall so that one side is on the back side of the blinds and the other side is on the front side. Do this on at the top and the bottom of the blinds. Then mount a small, cheap IR LED on one side of the bracket, and an IR detector on the other.
Motor: Doesn't have to be fast, (preferred to be slow actually) should be relatively strong. The motor should just wind up the string on its shaft.
Controls: These aren't really that in-depth because it's automatic. Basically, it's just on, off and a pot to control the sensitivity of the CDS cell.
Blind… "locker" :lol: : Once the blinds are done opening, a small solenoid mounted near the top of the blinds will pull the string to lock the blinds how it does, to prevent strain on the motor.
CPU: I would use a PIC for this. It will take the input from both of the blind sensors, the CDS cell and the pot. Depending on the data it gets from these, it will tell the motor to start, stop and reverse, and tell the solenoid to turn on or off.
Hope this helps.
Rain