I have been toying around with some ideas for PCB business cards. I wanted something cheap, clever, and not gaudy. I also wanted to make something that I could potentially etch myself to save on cost. What I’ve come up with so far is bcard. In addition to having my name, contact information, and QR code linking to my website, I designed a simple capacitive touch sensor scheme whereby pressing your finger on the button will make the LEDs located at the corners of the card light up. These are blue LEDs, so I’m actually thinking of inverting them so that they point into the PCB. As a result, the PCB should actually fluoresce. But that might not work… IDK.
Here’s my initial design. It uses an ATTiny10, a small transistor, 4 LEDs, a cap, and a resistor. The cap is probably unnecessary. There’s also two pads which I’ll probably make generate signals or something fun. The battery holder isn’t showing up correctly, but basically it’s just two pieces of metal that will sandwich the battery, which fits fully flush in the board.
I’m going to try to etch it soon and see how it turns out. It might be a total disaster, but I’m hoping otherwise.