Dinput

pdf svg

#define   sw    6
#define   led   11
int din;
void setup(){
pinMode(sw,INPUT);
pinMode(led,OUTPUT);
}
void loop(){
din=digitalRead(sw); //讀取D6的狀態
if (din==HIGH)
     digitalWrite(led,LOW); //如果D6為高電位(沒按) 則 LED 不亮
else
     digitalWrite(led,HIGH); //否則LED 亮
}

請將10K歐姆的電阻拔掉試試
將程式碼更改如下,再試試

#define sw   6
#define   led   11
int din;
void setup(){
pinMode(sw,INPUT_PULLUP);
pinMode(led,OUTPUT);
}
void loop(){
din=digitalRead(sw); //讀取D6的狀態
if (din==HIGH)
     digitalWrite(led,LOW); //如果D6為高電位(沒按) 則 LED 不亮
else
     digitalWrite(led,HIGH); //否則LED 亮
}

pdf svg

水銀開關

pdf svg

磁簧開關(reed switch)

pdf svg

pdf svg

邏輯且 (AND) &&

#define sw1 8
#define sw2 A1
#define led 11
int din1;
int din2;
void setup() {
pinMode(sw1,INPUT_PULLUP);
pinMode(sw2,INPUT_PULLUP);
pinMode(led,OUTPUT);
}
void loop() {
   din1=digitalRead(sw1);
   din2=digitalRead(sw2);
   if (din1==LOW && din2==LOW)
     digitalWrite(led,HIGH);
else
    digitalWrite(led,LOW);
}

pdf svg

接線如上圖，程式怎麼寫?

邏輯或 (OR) ||

#define sw1 6
#define sw2 A1
#define led 11
int din1;
int din2;
void setup() {
pinMode(sw1,INPUT_PULLUP);
pinMode(sw2,INPUT_PULLUP);
pinMode(8,OUTPUT);
pinMode(led,OUTPUT);
digitalWrite(8,LOW);
}
void loop() {
   din1=digitalRead(sw1);
   din2=digitalRead(sw2);
   if (din1==LOW || din2==LOW)
     digitalWrite(led,HIGH);
else
    digitalWrite(led,LOW);
}

記憶性開關

#define sw 6
#define led 11
int din0;
int din1;
int out=0;
void setup() {
pinMode(sw,INPUT_PULLUP);
pinMode(led,OUTPUT);
}

void loop() {
din0=digitalRead(sw);
delay(10);
din1=digitalRead(sw);
if (din0==LOW && din1==HIGH) //出現上升緣
out=!out;//反相
digitalWrite(led,out);
}

以上作法，是否有問題?

#define sw   6
#define led 11
int din;
int dinL=HIGH;
int out=0;
void setup(){
pinMode(sw,INPUT_PULLUP);
pinMode(led,OUTPUT);
digitalWrite(led,out);
}
void loop(){
din=digitalRead(sw);

if(din!=dinL)
{
     if (din==HIGH)
       {
          out=~out;
          digitalWrite(led,out);
       }
   }

dinL=din;
delay(10);
}

切換開關

雙切開關