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我试着为我的孩子制作肥皂泡机器人。很简单。伺服器上有一个杠杆，可以将环浸泡在肥皂水中并放在风扇前面。问题是当我激活 PWM 伺服器时开始出现异常行为（摇晃、颤抖到 0 位置），尽管它们没有同时运行。似乎在 PWM 期间伺服引脚中有一些噪音。 

  #include <Servo.h>
  Servo myservo;  // create servo object to control a servo
  #define MOTOR_PIN 11 
  int pos = 0;    // variable to store the servo position

  void setup() {
    myservo.attach(4);
    pinMode(LED_BUILTIN, OUTPUT);
    pinMode(MOTOR_PIN, OUTPUT);

  }

  void loop() {
    analogWrite(MOTOR_PIN,0);
    delay(100);
    for (pos = 30; pos <= 120; pos += 1) { 
      // in steps of 1 degree
      myservo.write(pos);              
      delay(10);                      
    }

     for (pos = 120; pos >= 30; pos -= 1) { 
      myservo.write(pos);              
      delay(10);                      
    } 

      digitalWrite(LED_BUILTIN, HIGH);   
      delay(200);                       
      digitalWrite(LED_BUILTIN, LOW);    
      delay(150);                       
      digitalWrite(LED_BUILTIN, HIGH);   
      delay(150); 

      analogWrite(MOTOR_PIN, 400);

      digitalWrite(LED_BUILTIN, LOW);    
      delay(150);      
      digitalWrite(LED_BUILTIN, HIGH);  
      delay(150);                       
      digitalWrite(LED_BUILTIN, LOW);  
      delay(150);      
      delay (3000);

  }

原型板伺服和 pwm 的图像

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