Pacemaker: live demo

healthy Pulse 59820332 · 2026-11-13T22:46:26Z · Monitoring only

An implant and its home transmitter. HEART watches pacing and never touches it. HEART runs on the bedside home transmitter, never in the implant.

Next in its story: power.battery-low in about 4 minutes.

What HEART Hub receives

Only the public Pulse and public alerts: the status and fault codes. Nothing else ever leaves the device.

Status	healthy		public
Battery status	ok		public

The owner or clinic sees these locally with a key. They are never reported.

Fault code	Severity	Status	Raised (UTC)	What HEART says
`system.main-function-lost` The system cannot do its main job. Every HEART MUST be able to detect this.	critical	resolved 22:45:00	22:42:05	Pacing is not capturing the heart. The capture threshold rose above the 2.5 V output during a slow-heart pause. Contact the clinic now.
`sensors.out-of-range` A reading is outside what is physically possible.	error	resolved 22:34:00	22:28:05	Lead impedance is out of range. About 3000 ohms, outside 200 to 2000 ohms: a possible lead fracture.
`connectivity.link-lost` A network link is down.	warning	resolved 22:20:00	22:12:05	The home transmitter cannot reach the implant. No reports while the link is down: HEART Hub shows a Flatline after three missed Pulse intervals.
`sensors.noisy` Readings jump around far more than normal.	warning	resolved 22:06:30	22:05:05	Electrical noise is being sensed as heartbeats. Noise may stop pacing when it is needed. Move away from strong magnets or motors.
`power.battery-low` The battery needs charging soon.	error	resolved 21:58:00	21:50:05	The battery has reached its replacement point. About 3 months left. Book a replacement.

Now do it for your own device and monitor it here: https://heartcortex.ai/monitor. Start from a template, follow the HEART specifications, then register your device with its claim code.

A demonstration that replays a one-hour story. Refreshes every 10 seconds.