Arduino Programming Basic - Serial Monitor

Arduino 程序基础，介绍Arduino程序的基本组成，第一部分编写数个例程，讲解关于变量及变量名称，串口监视器，if循环,for循环，while循环等。第二部分介绍了函数，全局变量，局部变量和静态变量，数据类型，Bollean运算，注释语句等。

Serial Monitor 串口监视器

串口监视器 Serial.println  1-5

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  Serial.println(1234);
}

void loop() {
  // put your main code here, to run repeatedly:
  
}

串口显示一个运算的结果 1-6

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  int a=2;
  int b=4;
  int c= a+b;
  Serial.println(c);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  
}

串口显示一个摄氏度转换华氏度的运算结果 1-7   

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  int degC=20;
  int degF;
  degF=degC*9/5 + 32;
  Serial.println(degF);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  
}

if 条件语句 1-8

int ledPin=13;
int delayPeriod =100;
void setup()
{
pinMode(ledPin,OUTPUT);
}
void loop()
{
  digitalWrite(ledPin,HIGH);
  delay(delayPeriod);
  digitalWrite(ledPin,LOW);
  delay(delayPeriod);
  delayPeriod =delayPeriod +100 ;
  if (delayPeriod>3000);
  {
  delayPeriod =100;
  }
}

For 循环语句例子 1-9

int ledPin=13;
int delayPeriod =100;
void setup()
{
pinMode(ledPin,OUTPUT);
}
void loop()
{
   for (int i=0; i<20;i++)
    {
      digitalWrite(ledPin,HIGH);
      delay(delayPeriod);
      digitalWrite(ledPin,LOW);
      delay(delayPeriod);
      }
      delay(3000);
}

这个程序的缺点是loop函数会运行较长的时间，处理器会被for循环语句占用，别的进程就无法调用处理，所以改进算法是尽可能快的让loop函数执行完，把进程空出来处理别的程序。

改进算法 1-9a

int ledPin=13;
int delayPeriod =100;
int count = 0;
void setup()
{
  pinMode(ledPin,OUTPUT);
}
void loop()
{
      digitalWrite(ledPin,HIGH);
      delay(delayPeriod);
      digitalWrite(ledPin,LOW);
      delay(delayPeriod);
      count++ ;
      if (count == 20)
      {
        count = 0;
        delay(3000); 
       }
}

While 循环 1-10

int ledPin=13;
int delayPeriod =100;
void setup()
{
pinMode(ledPin,OUTPUT);
}
void loop()
{
  int i=0;
  while(i<20)
   {
      digitalWrite(ledPin,HIGH);
      delay(delayPeriod);
      digitalWrite(ledPin,LOW);
      delay(delayPeriod);
      i++ ;
    }
  delay(3000);
}