似易又非易, 編程不簡單喔!!!!!!!!

andywwf

恭喜發財!! 身體健康!!

請問如何可以在呼吸燈由PWM 0~225, 225~0 之後停止1秒再閞始?

1. const byte pwmLED = 3;
   
2. 
   
3. 
   
4. // define directions for LED fade
   
5. #define UP 0
   
6. #define DOWN 1
   
7. 
   
8. // constants for min and max PWM
   
9. const int minPWM = 0;
   
10. const int maxPWM = 255;
    
11. 
    
12. // State Variable for Fade Direction
    
13. byte fadeDirection = UP;
    
14. 
    
15. // Global Fade Value
    
16. // but be bigger than byte and signed, for rollover
    
17. int fadeValue = 0;
    
18. 
    
19. // How smooth to fade?
    
20. byte fadeIncrement = 5;
    
21. 
    
22. // millis() timing Variable, just for fading
    
23. unsigned long previousFadeMillis;
    
24. 
    
25. // How fast to increment?
    
26. int fadeInterval = 50;
    
27. 
    
28. void setup() {
    
29.   // put pwmLED into known state (off)
    
30.   analogWrite(pwmLED, fadeValue);
    
31. }
    
32. 
    
33. void doTheFade(unsigned long thisMillis) {
    
34.   // is it time to update yet?
    
35.   // if not, nothing happens
    
36.   if (thisMillis - previousFadeMillis >= fadeInterval) {
    
37.     // yup, it's time!
    
38.     if (fadeDirection == UP) {
    
39.       fadeValue = fadeValue + fadeIncrement;  
    
40.       if (fadeValue >= maxPWM) {
    
41.         // At max, limit and change direction
    
42.         fadeValue = maxPWM;
    
43.         fadeDirection = DOWN;
    
44.       }
    
45.     } else {
    
46.       //if we aren't going up, we're going down
    
47.       fadeValue = fadeValue - fadeIncrement;
    
48.       if (fadeValue <= minPWM) {
    
49.         // At min, limit and change direction
    
50.         fadeValue = minPWM;
    
51.         fadeDirection = UP;
    
52.       }
    
53.     }
    
54.     // Only need to update when it changes
    
55.     analogWrite(pwmLED, fadeValue);  
    
56. 
    
57.     // reset millis for the next iteration (fade timer only)
    
58.     previousFadeMillis = thisMillis;
    
59.   }
    
60. }
    
61. 
    
62. void loop() {
    
63.   // get the current time, for this time around loop
    
64.   // all millis() timer checks will use this time stamp
    
65.   unsigned long currentMillis = millis();
    
66.    
    
67.   doTheFade(currentMillis);
    
68. 
    
69. }

复制代码

lwq1947

在else中的末尾添加一条 delay(1000);语句即可。另外若要LED完全熄灭请将const int minPWM = 0;改为const int minPWM = -5;

andywwf

lwq1947 发表于 2022-2-3 19:38
在else中的末尾添加一条 delay(1000);语句即可。另外若要LED完全熄灭请将const int minPWM = 0;改为const i ...

謝謝, 但用delay就會拖垮其他功能, 因為我還想加一個開關

lwq1947

andywwf 发表于 2022-2-3 21:40
謝謝, 但用delay就會拖垮其他功能, 因為我還想加一個開關

改后的程序能满足你的要求。
const byte pwmLED = 3;
int k=0;

// define directions for LED fade
#define UP 0
#define DOWN 1

// constants for min and max PWM
const int minPWM = 0;
const int maxPWM = 255;

// State Variable for Fade Direction
byte fadeDirection = UP;

// Global Fade Value
// but be bigger than byte and signed, for rollover
int fadeValue = 0;

// How smooth to fade?
byte fadeIncrement = 5;

// millis() timing Variable, just for fading
unsigned long previousFadeMillis;

// How fast to increment?
int fadeInterval = 50;

void setup() {
  // put pwmLED into known state (off)
  analogWrite(pwmLED, fadeValue);
}

void doTheFade(unsigned long thisMillis) {
  // is it time to update yet?
  // if not, nothing happens
  if (thisMillis - previousFadeMillis >= fadeInterval) {
    k++;
    if(k==20) {
      k=0;
      fadeIncrement=5;
    }
    if (fadeDirection == UP) {
      fadeValue = fadeValue + fadeIncrement;  
      if (fadeValue >= maxPWM) {
        // At max, limit and change direction
        fadeValue = maxPWM;
        fadeDirection = DOWN;
      }
    } else {
      //if we aren't going up, we're going down
      fadeValue = fadeValue - fadeIncrement;
      if (fadeValue <= minPWM) {
        // At min, limit and change direction
        fadeValue = minPWM;
        fadeDirection = UP;
        fadeIncrement=0;
      }
    }
    // Only need to update when it changes
    analogWrite(pwmLED, fadeValue);  

    // reset millis for the next iteration (fade timer only)
    previousFadeMillis = thisMillis;
  }
}

void loop() {
  // get the current time, for this time around loop
  // all millis() timer checks will use this time stamp
  unsigned long currentMillis = millis();
   
  doTheFade(currentMillis);

}

andywwf

lwq1947 发表于 2022-2-4 11:17
改后的程序能满足你的要求。
const byte pwmLED = 3;
int k=0;

謝謝大哥 lwq1947
可以了, 我會好好學習, 多謝指導, 受教了.
祝  您虎年
神功護體 百毒不侵 身體健康 恭喜發財