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OverheadProjector

Summary

A decent LCD video projector costs between $800 and $1200 dollars. Here, we build one for about $300. Great for hooking up to your computer and watching movies or playing games on a huge screen.

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Motivation

I've been reading about this craze recently and thought i'd give it a shot. Its been done and overdone, and mastered by so many people, i thought i'd throw mine out there too.

Introduction

A small dorm room might not sound like a great place for a big screen projector, i was a bit skeptical at first. I knew i needed a bigger screen, becuase my 17" computer monitor was not getting it done from 6 feet away. After finishing the projector i now have a 5 to 7ft. diagonal screen.

What you'll need

Part Cost/Unit QTY Total Link
Computer monitor flatscreen LCD TFT $170 1 $170 newegg
Overhead projector ~ $50 1 $50 ebay
80mm fans $4 2 $8 --
Power supply for the fans $30 1 $30 --
ABS plastic variety $20 -- $20 --
Plastic weld $3 1 $3 --
Utility knife -- -- -- --
Screw Drivers of all sizes -- -- -- --
Sand paper -- -- -- --
-- -- -- -- --
Total -- -- ~ $281 --


LCD TFT guide:


Steps

1. Set up projector - The first thing I did, before even buying the TFT, I bought the projector. I picked one up from Ebay for kinda cheap. Looking back you want to make sure you get a decent one, one that focuses well and is very bright (the most lumens). I bought a 3M model 2100 series. It's not bad, it has a double lens head which is pretty crappy and 2100 lumens. The brightness is just above good enough. It can be kinda dark during very dark moments. I think I can remedy this by encasing the entire thing to minimize backsplash on the walls. Try to get a triple lens (only has one lens and a mirror). I think that would work better for focus.

2. Remove TFT - The next thing that needs to be done is getting the TFT out of the monitor case. This can be trickier than you think. Take your time, look for all the screws, make sure you have them all before using brute force. Make sure not to damage the TFT at all; don't apply any pressure to the screen itself. I used a large piece of foam to lay the screen on so as not to damage it. After removing the case you will be left with a very thin, dark screen with circuits attached by thin flex cables. Be very careful not to put too much stress on these cables or flex them too much, they damage easily

3.

Sources and inspiration

Further Ideas