Welcome to QR 21. You have selected a watch face designed for a distinct tech aesthetic that organizes detailed data in a clean, visually balanced layout. This guide will present each of the 4 concurrent time formats so that you can get the most out of this watch face.
In fact, each of these unique time-telling formats could easily be a standalone watch face on its own. QR 21 packs all four of them together into a single, aesthetically pleasing, and highly organized display.
1. Reading the Four Concurrent Time Formats
QR 21 is likely one of the only watch faces available that provides four different ways to read the time, simultaneously, on a single dial.
The QR Matrix
The core visual engine in the center of your screen is a high-contrast 21×21 QR code that recalculates and regenerates every single minute. Simply open any standard smartphone camera app, point it at your wrist, and your phone will instantly decode the matrix to display the exact digital time.
- Real-World Use Case: This is incredibly handy when using an automated digital logging system or barcode scanner workstation where you need to instantly input the exact current time without manual typing.
Pure Unix Epoch Time
Positioned directly at the top of the dial is a live, ticking 10-digit Unix timestamp. This counts the exact number of seconds that have elapsed since January 1, 1970 (UTC). For more details on how this system operates, you can read the Wikipedia article on Unix time. You can also rest easy knowing that Wear OS is completely safe from the upcoming “Year 2038” Unix rollover issue, ensuring you can continue to use this watch face for years to come.
- Real-World Use Case: A perfect tool for backend developers, database administrators, or system engineers who need to correlate real-time server log events with the raw epoch timestamp right from their wrist.
Binary Indicators
The left and right borders of the dial feature structural binary tracking columns. The left column monitors the current hour, while the right column monitors the minutes. To make calculation easy, the circles show the specific values you need to add together (1, 2, 4, 8, 32).
These numbers map directly to raw binary code (1s and 0s), where an active filled indicator represents a 1 and an empty indicator represents a 0. For example, if the hour is 6, the binary sequence is read as 011000 (meaning only the 2 and 4 indicators are turned on).
- Real-World Use Case: This acts as a passive brain-trainer for software engineers and students looking to maintain their speed at reading and translating raw binary code on the fly.
- Format Note: The binary tracking columns operate strictly in 24-hour time to preserve traditional logical binary alignment.
The Analog Clock (“The Bezel of Truth”)
For a traditional reference, the outermost border of the dial functions as a dual-arc analog tracking system known as “The Bezel of Truth.” The left arc maps the current hours and the bottom arc maps the minutes.
To prevent visual clutter, individual tick marks appear every 5 minutes, alongside distinct triangle markers at the 0, 15, 30, and 45-minute positions. These markers are dynamic and only appear on the screen when the “hand” actually moves over them, helping you easily determine exactly where the hand is tracking without cluttering the dial.
- Real-World Use Case: Ideal for a quick glance during a meeting or presentation when you just need a fast, familiar visual sense of how much time is left in the hour without reading digits or scanning a code.
2. Hardware & Systems Monitoring
Hexadecimal Battery Status
Your watch’s power reserve is monitored using a raw hexadecimal value located at the bottom of the dial (labeled P:). This translates your standard battery percentage into an 8-bit hex string:
- 0x64: Full capacity (100% battery)
- 0x32: Half capacity (50% battery)
- 0x00: Depleted capacity (0% battery)
3. Settings & Customization
To access the internal layout options and theme configurations, long-press the center of your watch screen and tap the Customize icon (represented by a gear or pencil icon).
Color Themes
Swipe through the theme selector to choose from 15 distinct color palettes. The options include a variety of styles, from vibrant server-room terminal aesthetics to softer, lower-contrast variants designed to match your preference.
AOD Brightness Control
Because the central QR code is solid white, it can be quite bright when your watch enters its idle state. This setting allows you to manually reduce the brightness of the Always-On Display mode to a comfortable level that won’t distract you or others in dark environments.
Dual Format Integration
QR 21 automatically reads your paired mobile device’s core system configurations. The central QR code will seamlessly shift its output to display data in either standard 12-hour or military 24-hour modes based entirely on your phone’s system preferences.
(Note: As the primary function and namesakes of this watch face, the central QR Matrix remain visible at all times and cannot be toggled off).
4. Always-On Display (AOD)
QR 21 features a strict, power-optimized Always-On Display profile. When the screen drops into its ambient dim mode, the Unix timestamp, the battery status text, and the binary indicator columns are completely hidden to eliminate clutter and save power. Only the central QR Matrix and The Bezel of Truth remain visible.
5. Troubleshooting
The QR matrix won’t scan while the watch is dimmed.
- Cause: If your AOD brightness setting is turned down low, your smartphone camera may not detect enough contrast to successfully parse the matrix boundaries in ambient mode.
- Fix: Simply tap your watch screen or raise your wrist to power on the display. This instantly brings the face to full brightness, generating a clean, high-contrast code that is easy for any camera to scan.
Created by Second Hand Labs.