标签：#wearables

Have you ever wondered how your smartwatch actually knows you're stressed? Most of us treat the "Stress Score" on our wrists as a source of truth, but the logic remains hidden behind proprietary algorithms. Today, we are pulling back the curtain. We are going beyond basic heart rate tracking to perform PPG signal processing and HRV frequency domain analysis using Python. By the end of this guide, you’ll know how to ingest raw data via Bluetooth Low Energy (BLE) , apply digital filters with SciPy , and calculate the elusive LF/HF ratio to determine autonomic nervous system balance. If you are interested in advanced biometric algorithms or Python signal analysis , you’re in the right place. 🚀 The Architecture: From Photons to Stress Metrics Unlike standard heart rate (BPM), which just counts peaks, Stress Scores rely on Heart Rate Variability (HRV) —the millisecond-level variations between heartbeats. We'll be moving from raw light intensity data to a frequency-based stress index. graph TD A[Wearable Sensor / PPG] -->|Raw BLE Stream| B[Data Acquisition - Bleak] B --> C[Preprocessing - Bandpass Filter] C --> D[Peak Detection - Find R-R Intervals] D --> E[Cubic Spline Interpolation] E --> F[Fast Fourier Transform - FFT] F --> G[LF/HF Ratio Calculation] G --> H[Final Stress Score] 🛠 Prerequisites To follow this advanced tutorial, you’ll need: Hardware : A pulse oximeter or wearable that exposes raw PPG via BLE (e.g., Polar OH1, MAX30102 with an ESP32). Stack : NumPy & SciPy : For heavy-duty math and signal processing. Bleak : For cross-platform Bluetooth Low Energy communication. Matplotlib : To visualize the pulse waves. Step 1: Capturing the Raw PPG Stream (BLE) Photoplethysmography (PPG) works by shining green or red light into the skin and measuring the light absorption. First, let's grab that raw stream. import asyncio from bleak import BleakClient # UUID for the Raw PPG Characteristic (Device specific) PPG_CHAR_UUID = " 00002a37-0000-1000-8000-00805f9b34fb " def no

The Circular Ring 3 series announcement comes amid a year of heightened competition in the smart ring market, following the launches of the Oura Ring 5 and RingConn Gen 3.

Circular's smart ring gets NFC and a haptic motor to go with its one-line ECG.

Hohem has combined its gimbal tech with a wearable camera unit.

Anker has a bunch of new AI-infused headphones, earbuds and hearing aids on the way.

Several Garmin watches offer a built-in LED flashlight, but even if you have another brand, you likely have a decent light on your wrist.

Garmin's Cirqa band lacks the software and AI insights to make it a true Whoop rival.

Whoop Life is the highest tier of membership to the Whoop platform, and it does offer more data than the less expensive levels.

It's the second update in less than two months to address privacy concerns.

Speedo is offering up its own take on smart swimming goggles, but it won't offer feedback while you're in the water.

You can get a special Fitbit Air with a sleeping Pikachu design next month.

Pebble Time 2 is a smartwatch designed to push back against the trend, and it does so beautifully.

Luffu Link combines all day health sensing, voice logging, location awareness, and the ability to get help from trusted contacts into a single device, all without needing a phone nearby.

Tethered display glasses are truly practical face computers. They trade bulky spatial computing for simplicity: Plug in, recline, and get a massive screen right in front of your nose.

A whole bunch of smart watches are getting phased out this year. Is your watch on the list?

Our thoughts on Google's new smartwatch as it currently stands.

You probably use Bluetooth regularly, but different accessories call for different types of Bluetooth.

Samsung's newest party trick could actually help you improve your diet, and therefore your overall health.

AI notetaking hardware has taken off over the past couple of years, with credit-card-sized devices, pendants, pins, and even transcribing earbuds all promising to capture your meetings and turn them into summaries and action items. Now, a whole wave of wearables — rings especially — are betting people want to capture stray thoughts and ideas the same way. One of […]

Google says its new tools can act as an early warning system for diabetes.