Electronics > Projects, Designs, and Technical Stuff
Shining leds through the PCB
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MarkR42:
Can you just mount a normal SMD led upside down (a bigger one e.g. 1206), and route out an area for the lens? The ones I've got have a sticking up lens element. Maybe there are totally flat ones also, which could just be mounted upside down with a few holes underneath?

Update: Kicad has a footprint which does just that, called LED_SMD:LED_1206_3216Metric_ReverseMount_Hole1.8x2.4mm

DuPe:
maybe soldering a standard led on the bottom (solder) side of pcb would do the job?
mikeselectricstuff:
A side-firing LED, next to a hole in the copper and resist works quite well
Fred27:

--- Quote from: 3roomlab on May 09, 2019, 04:07:47 am ---assume the FR4 have light transmittance of 1%, your best hope of seeing anything is to use the brightest LED, which means there isnt much choice.

--- End quote ---
I've used reverse mount LEDs through PCB. It works just fine - in fact brighter then I expected. The one I used was an RGB version of the one pictured above.

UPDATE: This page contains a video where you can see how it looks. Easily visible in daylight.
https://www.element14.com/community/community/project14/nfc-rfid/blog/2019/04/28/locknfc-does-the-pcb-work
thinkfat:

--- Quote from: mikeselectricstuff on May 09, 2019, 10:50:16 am ---A side-firing LED, next to a hole in the copper and resist works quite well

--- End quote ---

Reasonably priced in 100s quantities, too :)
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