I want to build a drawer with a 3in LCD. I want to be able to push a button, and have it open up, and the LCD flip up. What should I use?

I reckon that's a pretty nifty looking mechanism there, which would work except for the 5 volt issue you are having. You can overcome that using a 7805 voltage regulator. These cost $2-ish and are very common, and will create 5 volts from your car power without needing to design a circuit for it.

Then, you can use the existing cd-rom to push it in or out from behind, without needing to design your own button press controlling circuit. electronicsteacher.com/tutorial/building... The benefit of a cd-rom tray is that they are very cheap and have their own mechanism built in to start/stop the motor at the end of movement. The down side is that in a car you simply may not have space for it + the height of the screen folded back.

I would encourage you to explore Picaxe chips. They cost as little as a couple of dollars. They don't require a separate board to program them.

Just your serial port + a couple of resistors. These things can drive servos directly. A hobby servo would be the neatest way to do things.

One servo to push the tray in and out, and one to flip the screen up and down. This would handle your button commands all on the one chip too. Alternatively, you could use any form of motors + mechanics that you like, then use the chip to receive the button input as well as control the timing of how long the motors run for etc.I would personally build this project either using servos, or, a screw drive.

Attach a long bolt to your geared motor. The thread on the bolt winds out a nut attached to your slide. Then with a hinge on your slide that the screen pivets on.

Screen laying face down with a cable tied to the back of the screen wanting to pull it upwards when the slide moves out far enough. That is, your slide keeps moving outwards but the cable runs out of slack a short distance before the slide stops moving, tightens then starts to raise the screen while the tray is still moving outwards. Then attach a spring / rubber band to pull the screen base backwards, so that when withdrawing the tray inwards and the cable goes slack, this pulls the screen back down flat facing downards ready to continue along the slide inwards.

I'm hoping this has given you a few more ideas anyway. Good luck. Edit: One more thing.

A cd-drive is designed with it's own internal circuit to keep the tray open/close mechanism working without the computer needing to be fully booted up. This is because you may need to use a cd to install your operating system etc.So, you don't need to fully wire up the cd-drive with a circuit on the IDE socket or anything like that. You just need 12 volts and 5 volts on the power socket.

Just find an old cassette tape players (shouldn't be hard) and rip the eject function out, then all you need is the open close mech, which (as already covered) can be done with a cd tray.

Ah you mean an electrical button lol I was thinking of a purely mechanical solution because when I think 'drawer' I think 'wood' . I will draw you up a crude paintfile lol of what I was thinking minus electricity. Okay this crude paintfile fails.

But there are no servos or anything involved, just a hinge or three and a rod. But what you really want could involve one or more servos, a relay or something, solenoids perhaps, for locking/unlocking or something. Lol I am not being very helpful tonight.

I bet you could modify an old cdrom drive that still opens/closes fine, add a ghetto hinge like in drawing, or gears, springs, whatever. There are many solutions, but taking a dremel to a cdrom drive sounds good to me because the car can supply 12vdc & the cdplayer will provide the button, open/close you just provide the pop-up action almost forgot to upload the pic, that is by far the most ghetto . Bmp I have ever drawn.

The red scribble thingamajig is saying like 'put a peg/stopper thing near here, so it doesn't move out of range. And the diagonal line is some piece of rod thing, that won't bend easily. Stainless steel would doit nicely.

Not to scale at all and hastily 'drawn. ' the blue thing is your screen, probably mounted on something like 'F' where = is the screen and | is the piece of whatever. There is a hinge in the middle, and the hinging rod thing connects on the bottom, swings it up when you pull the drawer out and puts it down when it's sliding in.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.