BPC Simulator on M5 ATOM Lite/Matrix/S3 Lite

© CC BY 4+ visibility679
© CC BY 4+
visibility679

It simulates the Chinese time calibration signal BPC to synchronize radio controlled clocks indoor.

link https://github.com/botanicfields/BPC-simulator
動画
開発素材
システム構成
system image
  • In China, the BPC time signal is transmitted, allowing radio-controlled clocks to be automatically synchronized.
  • However, if the clock is in a location where radio waves cannot reach, such as indoors, the time cannot be synchronized.
  • By sending a simulated BPC time signal near the clock, the time can be synchronized.
  • With the M5Stack, which can use Wi-Fi and NTP, you can obtain accurate time with NTP and generate a simulated BPC signal.
ストーリー
  • Based on the pseudo Japanese time signal JJY that I created previously, I implemented the specifications of the Chinese time signal BPC. The BPC time signal is transmitted at 68.5kHz.
  • I created a printed circuit board with a coil pattern that passes a weak current of 68.5kHz as a transmitting antenna, targeting only nearby radio-controlled clocks and watches. There are antenna boards for M5 ATOM Lite/Matrix/S3 Lite and for M5StickC/Plus/Plus2.
  • By adopting the M5Unified library, the software for M5 ATOM Lite/Matrix/S3 Lite was unified. The software for M5StickC/Plus/Plus2 was also unified.
  • Since the BPC time signal is composed of 100ms units, it was implemented simply using the Ticker interrupt library.
  • The operating status is displayed on the LED and LCD. It can be turned off by pressing a button.
  • Statistical information is collected to measure the Ticker jitter.
  • To simplify the Wi-Fi SSID/Password settings, the Wi-Fi Manager library was used.
  • Wi-Fi error recovery processing has been investigated and implemented.
  • A countermeasure for the Wi-Fi design fault of ATOM Lite/Matrix was applied.
  • RTC is now available. The RTC time is updated when NTP time synchronization is performed.
メンバー
  • user
    BotanicFields @botanicfields
    • Maker
    • Planner
    • Engineer/Programmer

関連イベント
  • event M5Stack Japan Creativity Contest 20242024-06-01 開催
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