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    ## Arduino 按壓開關與微動開關 ## 1.使用裝置 微動開關 - LinkIt 7697 NANO Breakout - 微動開關模組 ![](https://i.imgur.com/eUlvXMG.jpg) 按壓開關 - KSM050 彩色大按鈕模組 ![](https://i.imgur.com/ckejKuf.jpg) ## 2.運作原理 - 微動開關 外機械力通過傳動元件(按銷、按鈕、槓桿、滾輪等)將力作用於動作簧片上,當動作簧片位移到臨界點時產生瞬時動作,使動作簧片末端的動觸點與定觸點快速接通或斷開。 當傳動元件上的作用力移去後,動作簧片產生反向動作力,當傳動元件反向行程達到簧片的動作臨界點後,瞬時完成反向動作。微動開關的觸點間距小、動作行程短、按動力小、通斷迅速。其動觸點的動作速度與傳動元件動作速度無關。 - 按壓開關 ## 3. 電路接法 - 微動開關 ![](https://i.imgur.com/IWn9KvF.jpg) ![](https://i.imgur.com/CmQ4IfM.jpg) - 按壓開關 ![](https://i.imgur.com/yI9h5JI.jpg) ## 4.使用的程式碼 - 微動開關 ```cpp= void setup() { pinMode(5, INPUT); Serial.begin(9600); } void loop() { Serial.println(digitalRead(5)); delay(200); } ``` -按壓開關 ```cpp= const byte swPin = 2; const byte ledPin = 13; boolean ledState = LOW; int counter = 0; int debounceDelay = 200; // debounce delay (ms) unsigned long lastMillis; // record last millis void setup() { Serial.begin(9600); pinMode(ledPin, OUTPUT); pinMode(swPin, INPUT_PULLUP); digitalWrite(ledPin, ledState); } void loop() { boolean swState = digitalRead(swPin); if (swState == LOW) { if (debounced() && digitalRead(swPin) == LOW) { //debounced: reverse LED state ledState = !ledState; digitalWrite(ledPin, ledState); // 等待指令 while(statement); // 當按鍵一直被按著的時候,給一個空迴圈,表示什麼都不做, // 直到按鍵不再被按著的時候才離開這個迴圈繼續其他動作。 while(digitalRead(swPin) == LOW); Serial.print("LED Change State count:"); Serial.println(counter); counter++; } } } boolean debounced() { // check if debounced unsigned long currentMillis = millis(); // get current elapsed time if ((currentMillis - lastMillis) > debounceDelay) { lastMillis = currentMillis; // update lastMillis with currentMillis return true; // debounced } else {return false;} // not debounced } ``` ## 5.主要使用函式 ```cpp= digitalRead() ``` 透過照個函式我們可以透過Pin 7來讀取它的狀態。 ```cpp= delay() ``` 由於loop() 速度極快,每次按下的瞬間,事實上 digitalRead() 已經讀了數十次以上的開關 HIGH(奇數次) LOW(偶數次) 切換的數值了,因此解決問題的辦法就是使用時間延遲,多準備一個延遲的時間,來避免按壓按鈕的機械彈跳特性。 ## 6[](https://).參考網站 - 按壓開關程式 https://iscixin.github.io/freakhq/push-button/ - 微動開關程式 https://cavedu.gitbook.io/cavedu/rk001/module_ui/linkit7697_microswitch - 微動開關圖片 https://i.imgur.com/eUlvXMG.jpg - 按壓開關圖片 https://i.imgur.com/ckejKuf.jpg - 微動開關參考原理 https://www.easyatm.com.tw/wiki/%E5%BE%AE%E5%8B%95%E9%96%8B%E9%97%9C - 按壓開關參考原理

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