Arduino初体验

void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  pinMode(3, OUTPUT);
}

void loop() {
  digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  Serial.println("ok");
  digitalWrite(13, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
  
  long frequency = 300; //频率, 单位Hz  
   //用tone()函数发出频率为frequency的波形  
   tone(3, frequency );  
   delay(1000); //等待1000毫秒  
   noTone(3);//停止发声  
   delay(2000); //等待2000毫秒  
}

#include <Servo.h> 
Servo myservo;  // create servo object to control a servo 
                // a maximum of eight servo objects can be created 
int pos = 0;    // variable to store the servo position 

void setup() 
{ 
  myservo.attach(9);  // attaches the servo on pin 9 to the servo object 
} 
 
void loop() 
{ 
  for(pos = 0; pos < 180; pos += 1)  // goes from 0 degrees to 180 degrees 
  {                                  // in steps of 1 degree 
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(15);                       // waits 15ms for the servo to reach the position 
  } 
  for(pos = 180; pos>=1; pos-=1)     // goes from 180 degrees to 0 degrees 
  {                                
    myservo.write(pos);              // tell servo to go to position in variable 'pos' 
    delay(15);                       // waits 15ms for the servo to reach the position 
  } 
}

#include <Servo.h> // 声明调用Servo.h库
Servo myservo; // 创建一个舵机对象
int potpin = 0; // 连接到模拟口0
int val; //变量val用来存储从模拟口0读到的值

void setup() {
Serial.begin(9600);
 myservo.attach(9); //将引脚9上的舵机与声明的舵机对象连接起来
}

void loop() {
 val = analogRead(potpin); //从模拟口0读值，并通过val记录
 val = map(val, 0, 1023, 0, 179); //通过map函数进行数值转换
 myservo.write(val); // 给舵机写入角度
 Serial.println("OK");
 delay(15); // 延时15ms让舵机转到指定位置
}