Zulu Sierra

Every so often, I say to my partner: "you know, I don't know what I'll do next with Nunc, I think it's good."

As the planet warms, thanks to the myopic and greedy nature of humans, we must all become used to operating at greater temperatures.

In the short time I've been running ECG versus optical for my HRV reading, I've noticed a trend I find interesting: the optical HRV seems to be a good indicator of how well I slept, and the ECG HRV seems to be a good indicator of the effect of that sleep,…

When discussing heart rate monitors for a friend's partner recently, he pointed out she might not see the value in it, and is quite happy going for a run with just a watch.

For conversation's sake, I think I've had a phone with me almost constantly for every day of the last 20 years.

It might be more true to say I abhor them, but, as with all strong global statements one soon finds fault.

2026 is, arguably, the year of AI.

Part 7 left the MG's sync buffer wide open and its contents shut: 109-byte per-second records and 73-byte raw-PPG bursts, with heart rate at one known offset and everything else a wall of bytes.

The newer straps speak almost the same language as the WHOOP 4 we researched in Parts 4–6.

The WHOOP records all night and stores in in a buffer until requested.

Six nights, 356,000 records, thirteen algorithm variants, and a surprisingly honest answer from the data.

How a Raspberry Pi, two Nordic dongles, and a carefully-timed Bluetooth toggle revealed an undocumented protocol variant.

After a chest strap that leaked its ECG by accident and a band that hid everything behind one undocumented byte, here's the device that comes with a manual, and what I built on top of it.

Reverse-engineering the Wahoo TRACKR HR — no documentation, no SDK, no authentication.

How much data is your heart rate monitor actually capable of sharing, and what else could you use?

And she sat.