1. const int BUTTON = 8;
   
2. const int LED = 13;
   
3. int value;
   
4. void setup()
   
5. {
   
6.   // put your setup code here, to run once:
   
7.     pinMode(BUTTON, INPUT);
   
8.     pinMode(LED, OUTPUT);
   
9. 
   
10. }
    
11. void loop()
    
12. {
    
13.   // put your main code here, to run repeatedly:
    
14.     value = digitalRead(BUTTON);  // 讀取按鍵開關
    
15. 
    
16.     if(value){
    
17.         digitalWrite(LED, HIGH);// 按鍵按下，輸出高電平
    
18.     }else{
    
19.         digitalWrite(LED, LOW);// 按鍵送開，輸出低電平
    
20.     }
    
21.     delay(100);
    
22. }

復制代碼

1. const int BUTTON = 8;
   
2. const int LED = 13;
   
3. int value = 0;//記錄按鍵當下按下狀態,0為送開，1為按下
   
4. int lastValue = 0;//記錄上一次按鍵狀態
   
5. int keyValue = 0;//記錄當前LED狀態
   
6. void setup()
   
7. {
   
8.   // put your setup code here, to run once:
   
9.     pinMode(BUTTON, INPUT);
   
10.     pinMode(LED, OUTPUT);
    
11. 
    
12. }
    
13. void loop()
    
14. {
    
15.   // put your main code here, to run repeatedly:
    
16.     value = digitalRead(BUTTON);  // 讀取按鍵開關
    
17.     if(value !=lastValue){
    
18. keyValue =! keyValue;
    
19. }
    
20. lastValue = value;
    
21. 
    
22.     if(keyValue){
    
23.         digitalWrite(LED, HIGH);// 按鍵按下，輸出高電平
    
24.     }else{
    
25.         digitalWrite(LED, LOW);// 按鍵送開，輸出低電平
    
26.     }
    
27.     delay(100);
    
28. }

復制代碼