2017-09-27 (W) Electronic Business Card, Simple Flashing, BusiSimFl COMPLETED

Each battery-powered business card so far has had the same power terminals in the form of some header pin mounting holes. This started as a way to make it easy to find the power terminals while doing the layout but they have been kept around because it would be simple to add a 3V battery pack in lieu of the expensive 2032 coin cells. A hefty double-set of D-cells could power one of these cards for a very long time.

When the very first card was being tested, these terminals were used to check for voltage. As visual proof, a color-changing LED was soldered into the socket because the pin spacing was correct and it was more exciting than a simple red indicator. For a lot of reasons, it made sense to keep the terminals around. The first round with the color-changing LED also prompted this version of the card which uses color-changing surface mount (0805) lights.

Unnecessary but true words about a 555 timer

These boards require only a few solder joints to add the lights. There are no chips or passives to order or worry. The LEDs aren’t as cheap as single-color LEDs but they’re cheaper than a 555. In fact, the text “You can do that with a 555” was accidentally left on the board when it was ordered. Oops.

Card next to battery

There isn’t much innovation in these cards other than anyone can whip one up with a soldering iron, the card, and some lights. It wouldn’t even be necessary to use color-changing LEDs, regular 0805 LEDs would light up perfectly. It is also possible to leave some of the sockets bare and install, one, two, three, or four. Different colors could be used to light up with team colors or national colors. This one is a simple place to jump on PCB business cards with only basic SMD soldering skills and minimal parts.

Cool color cycling card

The second card is based on a conversation with a coworker where we discussed different projects outside of work. His projects involved maintaining his house and building functional furniture. My projects tended toward the whimsical. At the end of the conversation, I said, “I make stupid shit real.” The phrase stuck.

Vulgar electronic business card

Project page on EasyEDA

First time here?

Completed projects from year 1 
Completed projects from year 2
Completed projects from year 3

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2017-09-12 (Tu)