RS.H

以Serial方式，傳送指令給arduino，若收到A，LED亮，收到B，LED暗

PS. 可以把LED換成繼電器(Relay)(可控制電器)
繼電器上的
NC: Normal Close,
C: Common,
NO: Normal Open

code:
int led = 2;
char incomingByte;   // for incoming serial data

// the setup routine runs once when you press reset:
void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
}

// the loop routine runs over and over again forever:
void loop() {
  if(Serial.available())
  {
    incomingByte = Serial.read();
   Serial.print(“I received: “);
     Serial.println(incomingByte);
    if(incomingByte== ‘A’){
      digitalWrite(led, HIGH);
    }
    if(incomingByte== ‘B’){
      digitalWrite(led, LOW);
    }
    
  }
}


– 在putty上讀取特殊鍵盤值:

若亮度有一定變化就會讓LED亮
code:
int led = 2;
static int oldValue = 0;
// the setup routine runs once when you press reset:
void setup() {
  Serial.begin(9600);
}

// the loop routine runs over and over again forever:
void loop() {
  int value = analogRead(A0);
  int a = abs(value-oldValue);
  Serial.println(a);
  if(a > 50){
    digitalWrite(led, HIGH);
  }else{
    digitalWrite(led, LOW);
  }
  delay(50);
  oldValue = value;

}

若要顯示3，則讓abgcd，五支腳位通電
=> 把全部腳位接線，以2~10接上控制線，再以function形式呈現1234567890
=> 接好控制線後，不做任何控制(HIGH or LOW)，預設是全亮，所以會顯示8

– 為什麼當我們 digitalWrite(a, HIGH) 時，a卻是暗掉的呢?
=>
七段顯示器有共陽or共陰兩種，

int buzz= 13;
int low[]= {0, 1908, 1701, 1515, 1433, 1276, 1136, 1012};
int middle[]= {0, }
int high[]= {0, }

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

void play(int tone, unsigned long howlong){
  unsigned long time= millis();
  
  while(millis() – time < howlong){
    digitalWrite(buzz, HIGH);
    delayMicroseconds(low[tone]);
    digitalWrite(buzz, LOW);
    delayMicroseconds(low[tone]);
  }
  delay(10);
};

void play_little_apple(){
  play(1, 250);
  play(1, 250);
  play(5, 250);
  play(5, 250);
  play(6, 250);
  play(6, 250);
  play(5, 250);

  play(4, 250);
  play(4, 250);
  play(3, 250);
  play(3, 250);
  play(2, 250);
  play(2, 250);
  play(1, 250);

  
}

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


excel 算音階對應到的頻率
=ROUND(1/E2/2*1000000,0)

1. 以arduino實做一個打地鼠小遊戲，Serial序列顯示分數(可用七段顯示器或LCD替換顯示分數方式)，每3秒隨機一個LED發亮，玩家需要在三秒內按到該發亮LED對應的按鈕才算得分，成功得一分，失敗則扣一分。

2. 電路圖:

3. 程式碼:

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led1 = 2;
int led2= 3;
int led3= 4;
int led4= 5;
int led5= 6;
int button1 = 8;
int button2 = 9;
int button3 = 10;
int button4 = 11;
int button5 = 12;
static int score=0;
int keyValue=0;

// the setup routine runs once when you press reset:
void setup() {
  Serial.begin(9600);
  // initialize the digital pin as an output.
  pinMode(led1,OUTPUT);
  pinMode(led2,OUTPUT);
  pinMode(led3,OUTPUT);
  pinMode(led4 ,OUTPUT);
  pinMode(led5 ,OUTPUT);
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(button3, INPUT);
  pinMode(button4, INPUT);
  pinMode(button5, INPUT);
  initial();
}
void initial(){
 digitalWrite(led1,LOW); 
 digitalWrite(led2,LOW); 
 digitalWrite(led3,LOW); 
 digitalWrite(led4,LOW); 
 digitalWrite(led5,LOW); 
 Serial.println(“—–Welcome to Whack-a-mole Game!—–“);
}


// the loop routine runs over and over again forever:
void loop() {
  
  int a = random(2,7);      //隨機選取五個LED之一發亮
  digitalWrite(a, HIGH);  

  unsigned long time = millis();
  while( millis()-time < 3000){    // 三秒換一次LED發亮
    keyValue= digitalRead(a+6);
    if(keyValue){
    break;
    }
  //Serial.println(keyValue);
  delay(10);
  }
  
  if(keyValue){
      score++;
  }else{
      score–;
  }
  digitalWrite(a, LOW);
  Serial.print(“Score: “);
  Serial.println(score);
}


參考:
1. Autodesk circuit: (提供接線、coding模擬，功能完整，使用上方便，不會有爆炸危險XD)
https://circuits.io/circuits/