嘗試在多個LED上淡入淡出Arduino的奇怪問題

我試圖在Arduino Uno上的多個LED上淡出淡出。這裏是我寫的代碼嘗試在多個LED上淡入淡出Arduino的奇怪問題

int led[2] = {9,10};   // the pin that the LED is attached to 
int brightness[2] = {0,0}; // how bright the LED is 
int fadeAmount[2] = {5,15}; // how many points to fade the LED by 
long previousMillis[2] = {0,0};  // will store last time LED was updated 

long interval[2] = {30, 50}; 
// the setup routine runs once when you press reset: 
void setup() { 
    // declare pin 9 to be an output: 
    pinMode(led[0], OUTPUT); 
    pinMode(led[1], OUTPUT); 
    Serial.begin(9600); 
} 

// the loop routine runs over and over again forever: 
void loop() { 
    // set the brightness of pins: 

    for (int counter = 0; counter < 2; counter++) { 
    unsigned long currentMillis = millis(); 

    analogWrite(led[counter], brightness[counter]); 
    Serial.print("LED "); 
    Serial.print(led[counter]); 
    Serial.print(": Brightness "); 
    Serial.println(brightness[counter]);  

    if (currentMillis - previousMillis[counter] > interval[counter]) { 
     // change the brightness for next time through the loop: 
     brightness[counter] = brightness[counter] + fadeAmount[counter]; 

     // reverse the direction of the fading at the ends of the fade: 
     if (brightness[counter] == 0 || brightness[counter] == 255) { 
     fadeAmount[counter] = -fadeAmount[counter] ; 
     }  
    }       
    } 
}

這是奇怪的事情。如果我註釋掉串行的東西（打印和開始），淡入淡出不起作用。他們只是「閃爍」一點。

任何想法是什麼錯？

來源

2012-11-27 SpaceCowboy74

代碼太快？嘗試添加睡眠而不是打印語句並查看它是如何工作的......但是您可能正在爲您的眼睛過渡過快。 – neagoegab

我想通了。它看起來像我忘了一行代碼。

previousMillis[counter] = currentMillis;

我應該把在第一if語句中的代碼。我猜測通過使用連續打印進行觀察的行爲減慢了程序的運行速度，以致代碼似乎正常工作。

男孩，我感到愚蠢。

來源

2012-11-27 21:07:58 SpaceCowboy74

嘗試在多個LED上淡入淡出Arduino的奇怪問題

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