标签：#Wearable

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.

Circular announced its new Ring 3 Series today as a follow-up to the Ring 2 that debuted at CES 2025 with upgraded sensors and FDA-cleared atrial fibrillation detection. The new Ring 3 collection consists of both a Pro model that carries forward those same health-tracking features, and a smaller Slim option that offers more limited […]

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.

Meta is updating its AI-powered smart glasses to close a loophole that allowed wearers to keep recording after covering the front-facing LED. Alex Himel, Meta's vice president of augmented reality, writes in a post on Threads that "the camera will now stop working if the light is covered during a recording." The company's line of […]

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

Google teamed up with the Pokémon Company to introduce a special-edition Fitbit Air that works with the Pokémon Sleep app.

Speedo is launching a removable smart module for its Vanquisher goggles that can analyze a swimmer's performance across all four swim strokes: freestyle, backstroke, breaststroke, and butterfly. The new Speedo iQ system uses swim-specific sensors to analyze head movement in the water, time breaths, and track distance per stroke. Unlike other smart goggles, such as […]

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.

Your honor, We all know that the woman who sits before you is tired. Just look at the circles under her eyes. The novelty Pride and Prejudice T-shirt and Muji sweatpants that pass for pajamas. The unkempt, banana clip hairstyle that says "I really did wake up like this." But she's doing her best. And […]

Garmin just took the wraps off its new line of rugged Fenix 9 smartwatches, with the base model featuring an OLED display with a brightness of up to 3,000 nits, making it twice as bright as its predecessor. Starting at $999.99 for the 43mm case option, the Fenix 9 has 50 percent more RAM and […]

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.