🔍 Related Questions:
What role does the KT6368A Bluetooth chip play in time synchronization for perpetual calendars?
How does Bluetooth clock synchronization technology ensure accurate timekeeping in perpetual calendars?
What time synchronization protocols are supported by the KT6368A chip?

1. Overview of Time Setting Methods for Clocks In most perpetual calendar, clock, or alarm-type products, there are typically a few main ways to set the time:

Manual button adjustment: Usually involves three buttons to switch between year/month/day/hour/minute, plus two buttons for increment and decrement.
Wi-Fi time acquisition: Time is automatically retrieved via Wi-Fi—very user-friendly.
GPS-based time synchronization: Commonly used in outdoor devices or applications where high-precision time is needed. GPS signals are available 24/7.
Bluetooth-based phone synchronization: Time can also be synced via Bluetooth in two different ways:

Method A:
Open a corresponding app or WeChat mini program on the phone. After scanning and connecting to the Bluetooth device, the app interacts with the module to retrieve the date and time from the phone.

Method B (KT6368A solution):
Using the KT6368A dedicated Bluetooth chip, there's no need to install any app or mini program. The user simply enables Bluetooth in the phone's system settings—just like connecting to a Bluetooth speaker. Once connected, the KT6368A automatically retrieves the date and time from the phone and sends it via AT commands, making the process extremely simple.

1. Block Diagram / Operating Principle Example Phone Operations: Android: Two system-level permissions must be granted when connecting; otherwise, time cannot be retrieved. iOS: Even simpler—just connect, no special permissions required.

Once the Bluetooth connection is established, the chip automatically transmits the current time every second, e.g., with a command like:

AT+AT20250527134944
AT+AT20250527134945
AT+AT20250527134946
AT+AT20250527134947
AT+AT20250527134944, this string represents the date and time: 2025-05-27 13:49:44.

1. Pros and Cons of Using KT6368A for Clock Sync ✅ Advantages: Extremely simple to use: No complicated steps or operations. No app development required: Reduces software overhead and project time. Highly focused functionality: Only handles phone time acquisition—no bloated features. Indoor/outdoor compatible: Doesn’t rely on Wi-Fi or GPS availability.

⚠️ Disadvantage:
Slightly increases BOM cost, though the impact is minimal for most applications.

🧠 AI Summary
This document primarily discusses various time-setting methods used in products such as perpetual calendars, clocks, and alarms, with an emphasis on Bluetooth-based time synchronization. It introduces two Bluetooth approaches for syncing time with a smartphone, especially highlighting the KT6368A chip, its ease of use, operational steps, and benefits.

Key Points:

1. Time Setting Methods:

🔹Manual button-based adjustment

🔹Automatic time acquisition via Wi-Fi

🔹GPS module-based time synchronization

🔹Bluetooth time synchronization:

a) Via app/mini program

b) Via KT6368A chip (no app required)

1. Operating Instructions:

🔹Android: Must accept two permissions

🔹iOS: Plug-and-play connection

🔹Once connected: Time is automatically sent every second via AT command format

1. KT6368A Highlights:

🔹Plug-and-play simplicity

🔹No additional app required

🔹Reliable in both indoor and outdoor environments

🔹Slight cost increase, but offset by ease of integration and reduced development time

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