My open source 'business card" is an ATtiny85 development board utilizing a credit card form factor to easily fit into a wallet. It types out my contact info when a capacitive touch sensor is activated.
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Application
Board
Bootloader
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README.md

README.md

PCB Business Card by: Corey Harding
http://www.LegacySecurityGroup.com

My PCB "business card" was designed with a credit card sized form factor in mind to easily fit into a wallet. The board also doubles as an ATtiny85 development board with pins broke out and a prototyping area. The ATtiny85 is pre-programmed to type out my contact info when a capacitive touch sensor is activated. There are also several optional through hole component upgrades for the end user to experiment with. You can even program the board using the Arduino IDE. It is preloaded with a custom 1s delay micronucleus bootloader and it is digispark compatible.

I have seen other similar PCB business cards out there but I made sure to make my project easy for people to modify for personal use as well as allowing the person receiving the business card to have something extra to play with. I believe the ease of use and giving the end user something functional vs just something to look at and throw away is what makes my project stand out. Not to mention capacitive touch sensors are always fun to use!

Video Demo

Click image below to view
Video Demo
Image is of the board before the cleanup process but it shows off the embossed copper email address well.

Hardware License

Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0)
https://creativecommons.org/licenses/by-sa/3.0/
The hardware is based on the minimal schematic for a digispark/micronucleus compatible board. A few parts have also been added for better stability as well as a capacitive touch sensor. Gerber files are included in the repo to send immediately to a board house as well as Fritzing PCB files to allow users to easily customize my board design and export your own Gerber files.

Software

Utilizes the TinyTouchLib: https://github.com/cpldcpu/TinyTouchLib
Bootloader: https://github.com/micronucleus/

Initial programming instructions if building the board from scratch.

(Any of my assembled boards already have the bootloader burned in)
Fuse: avrdude -c buspirate -P /dev/ttyUSB1 -p attiny85 -U lfuse:w:0xe1:m -U hfuse:w:0xdd:m -U efuse:w:0xfe:m -B 20
Burn Bootloader: avrdude -c buspirate -P /dev/ttyUSB1 -p attiny85 -U flash:w:bootloader.hex:i -B 20
The Micronucleus build included has a custom 1 second programming delay before running the application.
The default 6 second delay was too long to wait to run the application for my specific use case.

Programming the application portion via the Arduino IDE.

File - Preferences - Additional Board Manager URLs - http://digistump.com/package_digistump_index.json - OK
Tools - Board - Boards Manager... - Digistump AVR Boards - Install
Board: Digispark (Default - 16.5mhz)
Programmer: Micronucleus

Jumpers

Cut J1 to disable the capacitive touch sensor.
Cut J2 to disable R5 resistor from RST to VCC.
Bridge J3 to enter programming mode when flashed with a different Micronucleus build.

Optional Features

Reset Switch
Power LED - Requires 1K Resistor
Utilizing the Prototyping Area
Flashing a new application via USB
Flashing via the AVR ISP header(Do not connect a programmer while connected to a USB port)

Notes

The board thickness is 1.6mm and requires a shim to fit snugly into the USB port.
Currently a blank PVC ID card is cut to size and bonded using Loctite 495 Instant Adhesive.
This has proven so far to be a fast, strong, and relatively consistent solution.

Enjoy!