Online ECG signal
Websocket Server
You can tinker with ECG-signals even without a hardware-kit.
A “realtime” ECG-signal is provided via the following websocket server: wss://signal.diy-ecg.org
p5.js Sketch
This signal can be viewed with a p5.js sketch: p5.js Web Editor.
p5.js is a JavaScript-based programming environment that runs directly in a web browser. It enables visualization of signals without any further software installation.