【求教】不知如何是好......

以防万一还是说一下整个装置吧
想做的是一个有五个键（压电陶瓷片），发声的同时可以发光的伪电子琴......
光和声都由键来控制，不是自动的
声音的延续时间比光短，本意是在前一个灯的光线还没完全消失的情况下，如果按下别的键，可以发出别的键对应的声和光
完整程序如下
int threshold=50;
int toneDuration=10;
int speakerPin=8;
int sensorValue1=0;
int sensorValue2=0;
int sensorValue3=0;
int sensorValue4=0;
int sensorValue5=0;
int led1=3;
int led2=5;
int led3=6;
int led4=9;
int led5=10;
int toneFrequency1=262;
int toneFrequency2=294;
int toneFrequency3=330;
int toneFrequency4=393;
int toneFrequency5=440;
int brightness = 0; // how bright the LED is
int fadeAmount = 5; // how many points to fade the LED by
unsigned long previousMillis = 0; // will store last time LED was updated
// constants won't change :
const long interval = 30; // interval at which to blink (milliseconds)
void setup() {
pinMode(led1,OUTPUT);
pinMode(led2,OUTPUT);
pinMode(led3,OUTPUT);
pinMode(led4,OUTPUT);
pinMode(led5,OUTPUT);
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
sensorValue1=analogRead(A0);
if (sensorValue1>threshold){
tone(speakerPin,toneFrequency1,toneDuration);
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
brightness = brightness + fadeAmount;
analogWrite(led1, brightness);
if (brightness == 0 || brightness == 255) {
fadeAmount = -fadeAmount ;
}
}
}
sensorValue2=analogRead(A1);
if (sensorValue2>threshold){
tone(speakerPin,toneFrequency2,toneDuration);
analogWrite(led2, brightness);
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
brightness = brightness + fadeAmount;
if (brightness == 0 || brightness == 255) {
fadeAmount = -fadeAmount ;
}
}
}
sensorValue3=analogRead(A2);
if (sensorValue3>threshold){
tone(speakerPin,toneFrequency3,toneDuration);
analogWrite(led3, brightness);
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
brightness = brightness + fadeAmount;
if (brightness == 0 || brightness == 255) {
fadeAmount = -fadeAmount ;
}
}
}
sensorValue4=analogRead(A3);
if (sensorValue4>threshold){
tone(speakerPin,toneFrequency4,toneDuration);
analogWrite(led4, brightness);
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
brightness = brightness + fadeAmount;
if (brightness == 0 || brightness == 255) {
fadeAmount = -fadeAmount ;
}
}
}
sensorValue5=analogRead(A4);
if (sensorValue5>threshold){
tone(speakerPin,toneFrequency5,toneDuration);
analogWrite(led5, brightness);
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
brightness = brightness + fadeAmount;
if (brightness == 0 || brightness == 255) {
fadeAmount = -fadeAmount ;
}
}
}
}
其实就是复制粘贴5遍....
因为我真的是小白.......

所以...希望大神明确告诉我如何修改.....
请不要给出
delay()函数是循环的函数，如果还没定时结束就不会执行下一句。
如果学过操作系统的话，这个问题很好解决。
给你一个思路：
millis()返回arduino从启动到当前所经过的毫秒数，大约42天后溢出。如果将当前的时间记录下来（时间戳），记为timeStamp，然后在之后某一时间进行一次(millis()-timeStamp)计算，就可以得出两次读数的时间差。一旦算出超过预定值，就可以执行后续语句什么的。
至于串口有没有数据，可以用Serial.available()来判断，它返回的是缓冲区中的字符数。或者直接写一个serialEvent()函数，如果串口有数据会在一个loop()执行完之后执行。BTW，用delay会导致loop()不能及时结束，即，推迟serialEvent()函数的执行。
后面的不说了，你先想想吧。
如上思路...
小白看不懂.....
ps.millis()是看着别人的程序照猫画虎......

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