ESP32 with NUS

tags: `ESP32` `MicroPython`

PaoyungMay 29, 2022

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ℳ𝒾𝒸𝓇ℴ𝒫𝓎𝓉𝒽ℴ𝓃 隨手記

聽程式在說話

剛開始使用 MicroPython 的時候，發現它與 Python 還是有著很大的差別，MicroPython 為了節省空間和記憶體，許多模組的功能都是 lite 版的，好在 REPL 可以邊試邊學，對於功力不夠的我實在是很便利，因此讓程式邊跑邊吐訊息成為我的日常… 但一旦把 ESP32 和其它電路擺在一起，或甚至已經裝設在會移動的設備上了，想監看它的運作狀態便成了難題。雖然可以把數據寫在 log 檔裡事後再行查看，可惜不能即時且得再接線連電腦下指令，多少還是有些不方便。
查詢文件後得知 WebRepl、Wifi Terminal、TCP Client/Server…等方法可以達到，不過對於我來說操作上還是不太順手，所以今天就換個角度，要提供的方法是使用 REPL over BLE UART 來完成。ESP32 自身就有藍牙功能，而且也能和 REPL 結合，用手機 APP 即能達到監看的效果。若加上多重開機和 KeyValue 後也可以選擇性的打開或關閉，如果你有以下的需求，就可以試試這個方法。

連著 COM Port 可以看即時訊息，但裝到可移動裝置上就無法連著線…
必須拆拆裝裝才能查看得到 ESP32 上的 log 檔…
雖然已有 Wi-fi Manager 模組可改 SSID 和密碼，但想改的不只有密碼，還有更多的參數…
在不適合連 COM Port 時需要動態改變變數的值以利測試…

相闗資訊：

NUS / Nordic UART Service

KeyValue

MicroPython 在 ESP32 的多重開機

BLE 模組

REPL over BLE UART 需要載入擴充模組，在 MicroPython 的 github 上已經有高手分享程式碼，以下3個檔案我們需下載備用。

在 ble_uart_repl.py 中已將裝置名稱設定固定為 mpy-repl，為能靈活更換我們自己的裝置名稱，所以拿 ble_uart_repl.py 來套娃產生我們的 bur.py。








# name: bur.py
from ble_uart_repl import *
 
def start(name):
  ble = bluetooth.BLE()
  uart = BLEUART(ble, name)
  stream = BLEUARTStream(uart)
  os.dupterm(stream)

在 main.py 中只要宣告裝置名稱即可啟用，這個名稱會出現在手機 APP 藍牙搜尋的裝置名單中。



# name: main.py
import bur
  bur.start('Mqtt_AIoT')

把 github 下載回來的3個檔案，以及 bur.py 和 main.py 上傳到 ESP32，ESP32 重啟並等待手機搜尋及連線。

APP

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手機上要安裝此 APP，請從 Google Play 搜尋 Bluefruit Connect 安裝並執行。

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Device 選擇 MQTT_AIoT，再選擇 MODULES 中的 UART。

Image Not Showing Possible Reasons The image file may be corrupted The server hosting the image is unavailable The image path is incorrect The image format is not supported Learn More →	Image Not Showing Possible Reasons The image file may be corrupted The server hosting the image is unavailable The image path is incorrect The image format is not supported Learn More →

開始使用

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打些指令試試吧！

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Image Not Showing Possible Reasons The image file may be corrupted The server hosting the image is unavailable The image path is incorrect The image format is not supported Learn More →	Image Not Showing Possible Reasons The image file may be corrupted The server hosting the image is unavailable The image path is incorrect The image format is not supported Learn More →

這個 BLE over UART 也可以自行撰寫成 WEB 界面，但我用這個 APP 已經足矣，就不再折騰了。

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The image file may be corrupted
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Image Not Showing Possible Reasons

The image file may be corrupted
The server hosting the image is unavailable
The image path is incorrect
The image format is not supported

關於作者

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我是 𝙋𝙖𝙤𝙮𝙪𝙣𝙜，是 MicroPython 及 Espruino 的愛好者，一直認為：

「Maker 應該把重心放在應用上，而不該被語言工具限制了創意」

所以想藉由較為簡捷且詳細的解說讓更多人可以學習進而自由發揮，而非淪為只能將程式碼複製貼上的複製人，如果你認同這樣的理念，請一起為此目標努力，如果我的文章內容對你有幫助，請轉發或協助需要的人。若你願意請我喝杯咖啡 ☕ ，我會因此受到鼓勵且喜悅，謝謝！

若有專案需求，請利用連絡我，謝謝！

🐍 ℳ𝒾𝒸𝓇ℴ𝒫𝓎𝓉𝒽ℴ𝓃 隨手記 | ☕ Espruino 隨手記