When your name is Simon and you want to build your own circuit board business card, it makes perfect sense to incorporate a game of Simon Says, and that’s exactly what [Simon] did with his Business Card.
You may see a resemblance to the Engineer’s Emergency Business Card; that’s because [Simon] took inspiration from that card to build his own. The game of Simon Says is played via 4 low-profile pushbuttons and 4 0805 LEDs. The microcontroller of choice to run the game is an ATtiny45 set up to work with the Arduino IDE. But with only 5 pins available for I/O, [Simon] had to give up 4 pins to the LEDs and configure the remaining pin as an analog input. The buttons are tied into a voltage divider that feeds the analog input, so depending which button is pressed, a different voltage is read in, thus a value from 0 to 1023 determines which button was pressed.
One of the great things about this write-up is that it goes through the process of etching PCBs at home using the toner-transfer method. We’re not sure how many home-etched business cards he’s willing to pass out, but surely whoever does get the card, will never forget his name.