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用 Raspberry Pi + Python 製作阿里山小火車上的影音導覽系統 - sosorry

歡迎來到 PyCon TW 2023 共筆

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共筆入口:https://hackmd.io/@pycontw/2023
手機版請點選上方 按鈕展開議程列表。
Welcome to PyCon TW 2023 Collaborative Writing
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Collaborative Writing Workplace:https://hackmd.io/@pycontw/2023
Using mobile please tap to unfold the agenda.

Collaborative writing start from below
從這裡開始共筆

任務目標

  • 多節車廂同步播放影音
  • 毫米級定位系統
  • 遠端系統更新

定位

  • 傳統GPS,使用GNSS訊號,精度在5m
  • Real Time Kinematic(RTK)可以到毫米級
    • 架構:基站+流動站+電話(20km)
    • 原理:接受GNSS訊號+合併RTCM校正

影音播放

播放器

兩個方案

  • OMXPlayer(2012~2019)
    • 優點:支援硬解H.264
    • 缺點:不支援64bit kernals
  • VLC(2019~)
    +

同步播放方案

切分or溶接?

遠端更新

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Python專案

  • 火車頭接收GNSS訊號
  • 使用MQTT傳遞訊號給車廂

QA

  • 實際導入有什麼問題?
    • A:還沒導入
  • 隧道問題怎麼解決?
    • A:反正不是12億的案子,沒差
  • Pi的震動問題?
    • 有固定鎖好的位置
  • 不同Pi4的規格有差異嗎?
    • 都一樣,甚至Pi2、3也可以,因為用硬解
  • 定位有考慮用Beacon?
    • 考慮到會有額外加的點,用GPS比較方便
  • 更新走什麼?
    • 無線網路

Below is the part that speaker updated the talk/tutorial after speech
講者於演講後有更新或勘誤投影片的部份

投影片下載