Circadian Wellness Clock: Initial submission for review

apps/crsclock/ChangeLog

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+0.01: Initial release – shows CRS, Steps, Mood, LightExp
+0.02: Added README.md and linked in metadata.json
+0.03: Added ChangeLog and linked in metadata.json
+0.04: Improved stats layout with 5px margins and truncation
+0.05: Added header color strip and shadowed time display
+0.06: Memory optimizations – history pruning and limited HRM sampling

apps/crsclock/README.md

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+## Circadian Rhythm Clock (CRS Clock) for Bangle.js 2
+
+### **Overview**
+
+**Circadian Rhythm Clock** is an advanced wellness clock for Bangle.js 2 that estimates and visualizes your body’s internal circadian time and alignment. It calculates a personalized **Circadian Rhythm Score (CRS)** using your recent sleep timing, physical activity patterns, and (optionally) heart rate data. The app helps users monitor their biological rhythms, optimize their sleep, and maintain healthy light/activity habits—even on a device with limited sensors.
+
+### **Core Features**
+
+#### **1. Real-Time CRS Calculation**
+
+* **CRS** is computed as a composite index using:
+
+  * **Sleep Timing** (from sleep/wake detection or manual window)
+  * **Activity Stability** (based on step data over the last 24 hours)
+  * **Heart Rate Stability** (if HR sensor is enabled)
+  * **Light Exposure Proxy** (counts “light hours” based on daytime activity if no light sensor is present)
+* **CRS** is shown directly on the main clock face, updated every minute.
+
+#### **2. Biological Time Display**
+
+* Shows the current **estimated biological time (“BioTime”)** in large, clear digits.
+* BioTime is adjusted using the user’s sleep phase offset and a configurable reference point (e.g., DLMO or CBTmin).
+
+#### **3. Health and Circadian Stats**
+
+* The main screen presents:
+
+  * **CRS:** Current circadian rhythm score (0–100)
+  * **Steps:** Total steps in the last 24 hours
+  * **Mood:** Detected from heart rate variability (HRV proxy)
+  * **Light:** Estimated hours of daytime activity (“light exposure”)
+* All stats update automatically.
+
+#### **4. Trend Visualization**
+
+* **CRS Trend Chart:** Shows CRS for each hour over the past 8–12 hours in a bar graph (visually displays circadian stability).
+* Helps users see the rhythm and recent disruptions.
+
+#### **5. Automatic Sleep & Wake Detection**
+
+* Uses step activity and (optionally) movement detection to infer sleep start/end times.
+* Triggers friendly alerts when sleep or wake is detected.
+
+#### **6. Hydration and Wellness Reminders**
+
+* Optional periodic reminders to hydrate, based on a user-configurable interval.
+
+#### **7. Simple Settings Menu**
+
+* Configure:
+
+  * Sleep window (manual entry)
+  * Hydration reminder interval
+  * Theme/color scheme
+  * Circadian reference (DLMO/CBTmin)
+  * Heart rate and sleep detection settings
+
+#### **8. Data Export & Reset**
+
+* Exports historical step, heart rate, and light proxy data as JSON for external analysis.
+* Full app data reset available from the menu.
+
+#### **9. Efficient and Stable Operation**
+
+* Aggressively trims stored history to a set maximum (e.g., 200 entries) to ensure stability and prevent memory overflows.
+* All heavy computations (like trend chart) are run only on-demand.
+
+### **Sensor/Hardware Adaptation**
+
+* If the **heart rate sensor** is unavailable or disabled, the app uses step/activity stability only.
+* If **no light sensor** is present (default for Bangle.js 2), the app estimates “light exposure” as the number of hours the user is active during daytime, outside their sleep window.
+* The app is robust to missing or partial data.
+
+### **User Experience**
+
+* **Always-on Clock:** Appears as the default watch face, with tap, button, or swipe to access stats and menu.
+* **Vivid, readable interface** with color themes and a clean, minimal design.
+* **Alerts** for hydration and sleep transitions are gentle and non-intrusive.
+
+
+### **Intended Users**
+
+* Anyone interested in **improving sleep, productivity, or circadian health**.
+* Shift workers, travelers, or students seeking to track and align their biological clocks.
+* Users who want more than a step counter—actionable, science-based feedback on internal time.
+
+### **How It Works**
+
+1. **Collects step and (optionally) heart rate data** in real-time.
+2. **Calculates CRS** using the variability and timing of steps, sleep, and HR (if available).
+3. **Estimates light exposure** hours using step data during daytime.
+4. **Presents key circadian health metrics** on the main watch face.
+5. **Offers friendly reminders** and data export for deeper analysis.
+
+### **Technical Details**
+
+* **Code:** JavaScript (Espruino), optimized for Bangle.js 2
+* **Persistent storage:** Steps, heart rate, and light/“light hour” proxies saved locally, aggressively pruned for memory safety.
+* **User interface:** Button/touch/swipe navigation, E.showMenu/E.showAlert for dialogs, custom clock face rendering.
+* **No dependencies:** Runs entirely on the watch—no phone, no cloud required.
+
+## Author
+
+Jakub Tencl, Ph.D.  
+[https://ihypnosis.org.uk](https://ihypnosis.org.uk)
+
+## Patent and Licensing
+
+This app is based on methods described in UK Patent Application GB2509149.7:  
+**"Wearable Circadian Rhythm Score (CRS) System for Estimating Biological Time"**
+
+Unless otherwise stated, this project is released under the MIT license.  
+Use of the patented method may be subject to licensing or permission.  
+For inquiries, contact the author.
+
+### **Summary**
+
+The Circadian Rhythm Clock transforms the Bangle.js 2 into a **bio-aware, personalized circadian dashboard**, guiding users toward better alignment with their biological clock and modern life.
+It is ideal for anyone who wants to visualize and optimize their internal rhythms using open, transparent algorithms—right on their wrist.