Last Christmas I were looking for a present for my girlfriend but I didn't want to just buy her something. It seemed to easy so I decided I was going to use my electronic experience and make her something unique. I wanted something that showed her how I feel about her.

I thought about making something with a picture but that is kind of boring. But suddenly I remembered that I had etched a photo on a PCB for a friend. That was perfect for her, I know she would like it. I played around with photoshop and finally decided for a picture that I made to black and white and then used the toner transfer method to transfer to PCB. There were some large areas that got some small holes in it so I had to fill them with a special pen. I also think that I should have swiched the black and white but it works kind of nice anyway. I finished the picture by spraying it with a transparent spray for circut boards protecting it from oxiding and getting ugly.

At the same time I found a really nice project with seven segment displays, link.
But I only had yellow displays and that would not work, so I grabbed my bag of 3 mm red LED, bought cheap from Hongkong, and started playing around with a prototype board. In the article they painted it white but I wanted the board to disappear and only show the text so I painted it black. I added a USB cable for power and put a lot of SMD resistors because that was all I had at home with 220 ohm.

All LEDs in a column is connected in series and all columns in parallel. I put as many resistors in parallel for each column as there were LEDs. But I didn't think about the heating of the resistors so the board get kind of warm and nice. I don't see this as a bug but more like a feature... :-)
<p>hex file need this project</p>
Nice. Looks like2 projects worth combining. The 'love' could be part of the photo, using SMT LED for low profile.<br><br>You'll get better 2-color photo results with large dot dithering, or newspaper halftone. Gimp or photoshop can do it. Just remember folks that fine detail may not etch well.
Very nice. I found this as I'm looking to do something similar. Never done PCB&nbsp;etching though.<br /> <br /> Did you invert the B&amp;W before etching? To me it looks as if the dark bits (such as the bikini) were the corroded / eroded ones (where the black on the original image should have protected the copper).<br /> <br /> Also, what was the spray you used to protect from future oxidation?<br /> <br /> Anyway, looks great and reassures me that this should work wonderfully :D
your GF is lucky! <sup>_&lt;</sup><br/>

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More by callelj:Etched photo and LED text, perfect for Valentine's day 
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