Testing Acrylic for Blobs

I am feeling lucky that I got smooth edges, now comes testing of acrylic for getting blobs.

I prepared 4 series of 10 IR LEDs in each series, the wiring diagram goes as below


These rail of LEDs are pasted over the edges of the Acrylic and connected to 18.5v Laptop power adapter. You will see that I used 56ohm resistor instead of 68ohm mentioned in the diagram, actually I could not find 68 one any nearby I will try to gather one while completing the table.

I took a box (which is a outer box of the geyser I bought recently) around 15 inch in depth, kept the modified webcam in the center of the box.

I think I did not tell you about modifying the webcam, I just unscrewed the Lens and removed IR filter then covered the lens with floppy film (I may need to replace with some other IR band pass filter).

On the box with webcam below I put the acrylic screen connected every thing as needed (I mean power supply and the webcam).

Now comes testing for blob. Launch CCV and tried to find blobs. As I done some previous testing with MiniMT also my ccv got corrupted this needed deleting of config.xml.

At first I can see my whole hand but no blobs, after applying some coconut oil and adjusting through camera properties (like gamma correction, white balancing etc. just hit and tried) I can see some blobs but these are not mature enough to port so I applied last thing, some water on my fingers and VOILA there are blobs detected Cute and Sexy. see below.

Whats next:
- Arrange wooden beeds to fix LEDs and the acrylic.
- Arrange Complient surface (I have seen Silicon spray which may be used.)
- Arrange mirror as the box is too small for whole screen to capture, right now the cam is seeing only 50% area, I could not increase depth (as I need to fit this assembly in my daughter's study table).
- Major part, disassembling LCD.

Preparing Acrylic Edges.

Over the Week, I have been working on preparing the edges of the Acrylic sheet. The sheet I got was some what uneven and being noob it cost me much time to clear the edges (Also could not devote much time for the project due to diwali).

My first step was to make the Edges even for This I used knife to cut out all the protruding edges.

After cutting out edges I filed the edges with a file around 25 frictions at each place.
The first finish edge look somewhat like this.

Once filing on all surfaces is done, I used emery stone then 150 grit sand paper then 1500 grit sand paper.

After Sanding and some rubbing with cotton cloth, the edges look much clearer but not transparent. To make them transparent it took a hell lot of work. I put some brasso on edges and rubbed the edges with cotton cloth, the edges are more clear but still not 100% transparent means when I put the screen on printed paper I can recognize the color of the written material from other side but could not read it. The last thing I done is used hair drier to blow hot air over the edges, This made more clearer, still cannot read whole thing written on the paper below other edge but I can recognize some letters. The edges now look like as below, (I am not too good in photography, I will learn after completing this project)