Arduino搭配伺服馬達下個指令會突然斷掉

jim824202002

功能想法:想做一個可以下指令給馬達驅動，是由0度到九十度再由九十度到0度

可是第一次給指令卻可以執行，但再給一次指令卻發生問題，請各位高手可以幫我們求解。

這是我做的驅動馬達程式碼:

#include <Servo.h>

Servo myservo;

void setup()

{

myservo.attach(9);

Serial.begin(9600);

}

void loop()

{

   

    if(Serial.available())

   {

    char ch = Serial.read(); //CHAR=字元

    switch (ch)

    {

        case 'A':

        myservo.write(0);

        delay(2000);

        digitalWrite(9,HIGH);

        break;

        

        case 'B':

         myservo.write(90);

        delay(2000);

        digitalWrite(9,LOW);

        break;

        }

      }

    }

這是會發生以下的問題:

        java.io.IOException:

        Input/output error in writeArray

at gnu.io.RXTXPort.writeArray(Native Method)

at gnu.io.RXTXPort$SerialOutputStream.write(RXTXPort.java:1124)

at processing.app.Serial.write(Serial.java:517)

at processing.app.Serial.write(Serial.java:540)

at processing.app.SerialMonitor.send(SerialMonitor.java:200)

at processing.app.SerialMonitor.access$100(SerialMonitor.java:32)

at processing.app.SerialMonitor$4.actionPerformed(SerialMonitor.java:96)

at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)

at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)

at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)

at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)

at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)

at java.awt.Component.processMouseEvent(Component.java:6263)

at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)

at java.awt.Component.processEvent(Component.java:6028)

at java.awt.Container.processEvent(Container.java:2041)

at java.awt.Component.dispatchEventImpl(Component.java:4630)

at java.awt.Container.dispatchEventImpl(Container.java:2099)

at java.awt.Component.dispatchEvent(Component.java:4460)

at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4574)

at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)

at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)

at java.awt.Container.dispatchEventImpl(Container.java:2085)

at java.awt.Window.dispatchEventImpl(Window.java:2475)

at java.awt.Component.dispatchEvent(Component.java:4460)

at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)

at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)

at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)

at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)

at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)

at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)