abetusk designed an “8-bit” style LED heart with MeowCAD and has shared the board on OSH Park:
8bit heart 20150503
The LED matrix is controlled by an Atmel ATMega328 microcontroller and the code to scroll text available on GitHub:
GitHub: 8bitheart
The parts list for Digi-Key is also available in that repo: BOM.csv
Here’s a video of the 8-bit heart in action:
abetusk is the creator of MeowCAD:
An online free and open source electronic design tool that runs in your browser.