2018-01-08 (M) SunkenLED Business Cards COMPLETED and Successful

The electronic business cards were revised with an experimental design. The LED locations were given holes so the LEDs could sit flush with the back of the board. Solder pads had to be added to the backside of the board for this test.

NFC business cards, front and back

Two boards were tested with this change. One used NFC for power and one used a battery. Inserting the LEDs was difficult since they were snug but it also made it possible to hold the LED in place with friction while soldering. Placing them in the sockets required delicate placement.

Battery powered card with sunken LEDs installed

The change worked well. Assembly took longer but the result was a thinner card which may qualify this as the thinnest electronic business card. If the LEDs were the same thickness as the board and the sides of the hole were tinned, it would be possible to make it even thinner.

Stack of thin business cards

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2017-12-29 (F)