UNI-T UT61E Backlight, Part 2

Testing LED's, left to right:

1. 3mm LED's from Amazon (cheapest and brightest)
2. Lite-On LTST-S220KGKT
3. LG Y876-P1Q2-24-Z

The cheap LED's are running at 3.5mA while the other two are at 7.5mA. I'm curious why the huge difference in light output.

Since I wasn't planning on 3mm LED's, the backlight board doesn't lay flat. I had to do a little choppy-choppy on the board and the LED's.

Onto the touch board, it works ... first time! My sense pad is a blue tape covered scalpel blade.

 Installing the touch board. Kapton tape on back as a little buffer. Power leads connected.

And a lot more Kapton on top after backlight and sense leads attached.

To be continued ...

CadSoft EAGLE + Single Layer SMD Design = OSH Park Errors

Problem: Recently designed a single layer board with only SMD components, but copper pours on both sides. Upon uploading to OSH Park, I got several errors like "no bottom mask", "no bottom silk" and "drill file missing". To move forward, you have to approve the design by selecting a check box.

I didn't want my component-less bottom copper to lay unmasked against other components after installation.

Answer: To keep OSH Park from throwing errors and also include bottom solder mask and a drill file, place a via outside the board's perimeter. This in essence  creates a 2-layer board from a 1-layer design.