Electrical engineer Dániel Buga has constructed a enterprise card that actually reveals his finger is on the heartbeat — fairly actually, because the Card/IO serves as a single-lead electrocardiogram (ECG) monitor, plotting the holder’s coronary heart charge on-screen.
“Card/IO is an open supply single-lead ECG applied as a enterprise card-like gadget, and its surrounding software program methods,” Buga explains. “[The design] is a 4 layer PCB containing the MCU [Microcontroller Unit], show, battery, and associated circuitry. The ECG frontend, ADC [Analog to Digital Converter], and contact detection/wakeup generator [are] applied as a solder-on daughter board.”
Designed to imitate the tough footprint of a enterprise card, the Card/IO is constructed round an ESP32-WROOM-32 module, giving it two Tensilica Xtensa LX6 CPU cores operating at as much as 240MHz and built-in Bluetooth 4.2 and Wi-Fi connectivity. This module is mounted on a PCB the entrance of which is surprisingly spartan: two uncovered copper contacts and a compact show.
Push your thumbs towards these two contacts, although, and the Card/IO springs into life — utilizing the ECG front-end daughterboard to amplify the sign from the blood pulsing via your thumbs and show it on-screen as a traditional electrocardiogram (ECG).
The board is pushed by an ESP32 module, with a daughterboard dealing with the ECG work. (📷: Dániel Buga)
Buga has additionally hinted at the potential of utilizing the Wi-Fi radio to hook up with a cloud platform for extra detailed logging and evaluation — although, on the time of writing, the code for this had not been publicly launched.
These considering constructing their very own Card/IO can discover design recordsdata and supply code within the mission’s GitHub repositories, beneath the permissive MIT license. “There are some vital points (just like the gadget freezing),” Buga warns these trying to comply with in his footsteps, “however hey, that is me!”