Card/IO is an open source, single lead ECG in a business card-like format.
The project contains two PCB designs, created using KiCAD 7:
- main_board: main/carrier board, which is a 4 layer PCB containing the MCU, display, battery and related circuitry
- frontend: the ECG frontend, ADC, and touch detection/wakeup generator, implemented as a solder-on daughter board