March 2017
Intermediate to advanced
232 pages
4h 44m
Chinese
Content preview from 自造手冊：新工業革命實務指南
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第 17 章 擴充 Arduino
166
圖 17-2
電熱感測器的接法
在感測器隨附的說明文件中，通常可找
到如何將 Arduino 讀取數值轉換為您所
需數量級的相關資訊。
光敏電阻
有些材質會對光有所反應，亮度改變時，
會影響它們的電阻值。
圖 17-3
中的這些
材質即可用作光敏電阻—亮度改變時，
小碟的電阻值會跟著改變。
圖 17-3
光敏電阻
光敏電阻的電路配置（
圖 17-4
）與電熱
調節器的電路相同。許多其他的類比元
件也都是用一樣的電路配置。基本上，
電壓分壓器中有一個光敏電阻，您需要
與 這 個 光 敏 電 阻 符 合 的 電 阻。 若 光 敏
電阻的最大電阻值為 10K，就需要一個
10K 的電阻。
圖 17-4
光敏電阻的電路配置與電熱調節器相同
不管是光敏電阻還是電熱調節器，您都
會用 到 analogRead 指令，如
第 157 頁 的
「超越數位」
所述。
其他種類的感測器
其他會隨壓力、彎度、溼度而改變其電
阻值的材質，它們也都可以作為感測器。
還有一些更複雜的感測器，可以測知特
定氣體、地球磁場、物體的加速度以及
其他現象（
圖 17-5
）。基本上，大概任何
事物都能用感測器來偵測，還可以應用
一些其他的裝備，像收音機、相機等。
舉例來說，網路攝影機搭配特定的應用
程式，可以用來感測顏色、形狀、人等
等（不過，您可能需要準備 Raspberry Pi
或電腦。）
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