敘述跟指標ＶＲ可變電阻控制ＬＥＤ燈

http://yhhuang1966.blogspot.tw/2015/09/arduino_14.html

Arduino 基本語法筆記

++x;
x++;

if  else 敘述
int x=20;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  if ((x%2)==0)
  {
    Serial.println("1");
  }
  else
  {
    Serial.println("2");
  }
===========================
if
else if

int x=20;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  if (x>=90)
  {
    Serial.println("segament 1");
  }
  else if (x>=80)
  {
    Serial.println("segament 2");
  }
  else if (x>=70)
  {
    Serial.println("segament 3");
  }
   else if (x>=600)
  {
    Serial.println("segament 4");
  }
  else
  {
    Serial.println("segament 5");
  }
}
=======================
for迴圈
語法
for(開始值；終止值；增量值)
{
     [循環區塊]
}

int total=0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  for(int i=1;i<10;i++)
  {
    for(int y=1;y<10;y++)
    {
      total=i*y;
      Serial.print(i);
      Serial.print("*");
      Serial.print(y);
      Serial.print("=");
      Serial.print(total);
      Serial.print(" ");
    }
    Serial.println();
  }
}
=========================
正向
void setup() {
  // put your setup code here, to run once:
    for(int i=7;i<=13;i++)
    {
      pinMode(i,OUTPUT);
    }
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int j=7;j<=13;j++)
  {
    digitalWrite(j,HIGH);
    delay(3000);
  }
}
===================
逆向
void setup() {
  // put your setup code here, to run once:
    for(int i=13;i>=1;i--)
    {
      pinMode(i,OUTPUT);
    }
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int j=13;j>=1;j--)
  {
    digitalWrite(j,HIGH);
    delay(3000);
  }
}
============================
void setup() {
  // put your setup code here, to run once:
    for(int i=13;i>=1;i--)
    {
      pinMode(i,OUTPUT);
    }
}

void loop() {
  // put your main code here, to run repeatedly:
  for(int j=13;j>=1;j--)
  {
    digitalWrite(j,HIGH);
    delay(100);
    digitalWrite(j,LOW);
  }

    for(int j=7;j<=13;j++)
  {
    digitalWrite(j,HIGH);
    delay(100);
     digitalWrite(j,LOW);
  }
 
 
}
===========
anoloaRead(變數) A0-A5/PWM ~D3
anolofWrite(接腳，類比值)

const int va=A2;
const int led=9;
void setup() {
  // put your setup code here, to run once:

}
void loop() {
  // put your main code here, to run repeatedly:
 int sv=analogRead(va);
  analogWrite(led,sv/4);
  delay(150);
 
}