August 2017
Intermediate to advanced
272 pages
5h 32m
Chinese
Content preview from Node.js物聯網裝置開發
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第七章 製作原型需要的零件
如何與之溝通
，
例如使用何種傳輸協定
較為簡單的零件，可能只會輸出數位訊號或類比電壓，其他零件則可能採用 PWM。
若是擁有微控制器的零件模組，則規格書應會詳細註明使用何種傳輸協定，如 I2C
或 SPI。
腳位功能
腳位功能秀出該如何連接方能運作，並指出各個腳位的作用（如電源、傳輸腳位）。
被動式零件
為了調整電壓或訊號形狀，我們需要各種「被動式」電子零件，其中簡單的例子之一是
陶瓷電阻，由陶瓷和電線組合而成的物理靜態零件。再舉兩個更為進階的例子，如按壓
開關和可變電阻。
可變電阻（電位器）通常用來調整電壓、調整到某特定準位，例如使用可變電阻來調整
音量、或是 LCD 顯示器的亮度。另外可用來「模擬」感測器，雖僅是簡單形式但非常
便利。感測器通常會輸出變動的電壓，而旋轉可變電阻的旋鈕，也可製造出類似的效
果，由所連接的類比腳位讀取，但比起使用感測器時所需設置的環境，更為簡便。
除了提供參考電壓，電阻和可變電阻也可用來保護主動式電子零件，如 LED，保護不會
因大電流而燒毀。
如圖 7-10 所示，SparkFun 公司以 Eagle 裝置程式庫的形式，提供了豐富的被動式與機
電式零件。裝置程式庫可輔助我們在 PCB 設計專案中，妥善地管理各個零件；SparkFun
釋出的裝置程式庫，內建提供了許多好用的零件，包括機電裝置，如按壓式開關和精密
可變電阻。
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.