Robofun 機器人論壇

標題: 用arduino做吉他調音器頻率的問題(急) [打印本頁]

作者: pu758614 時間: 2015-3-1 02:27
標題: 用arduino做吉他調音器頻率的問題(急)
我正在做一個吉他的調音器
我在網路上找到了一個計頻器，說也可以測聲音頻率
所以我用他改寫成一個吉他條音器

我硬體部分我麥克風模組直接輸入ARDUINO 判斷準度輸出LED

程式如下
int divider[6] = {0, 1, 8, 64, 256, 1024};
int prescaler = 5;
double count = 0;
double middle = 0;
char x = 0;
int a;
int led1G=3;
int led1R=5;
int led1B=6;
int led2G=9;
int led2R=10;
int led2B=11;
int led3G=A0;
int led3R=A1;
int led3B=A2;
ISR(TIMER1_OVF_vect)
{
if (prescaler < 4)
{
      prescaler++;
}
}
void interrupt()
{
if (!x)
{
      count = TCNT1;
      TCNT1 = 0x000;
      TCCR1B = prescaler;
      attachInterrupt(0, interrupt, FALLING);
}
else
{
      middle = TCNT1;
      attachInterrupt(0, interrupt, RISING);
}
x = ~x;
}
void setup()
{
Serial.begin(57600);
TIMSK1 = 0x01;
TCCR1A = 0x00;
attachInterrupt(0, interrupt, RISING);
pinMode(led1G,OUTPUT);
pinMode(led1R,OUTPUT);
pinMode(led1B,OUTPUT);
pinMode(led2G,OUTPUT);
pinMode(led2R,OUTPUT);
pinMode(led2B,OUTPUT);
pinMode(led3G,OUTPUT);
pinMode(led3R,OUTPUT);
pinMode(led3B,OUTPUT);
}
void loop()
{
Serial.print("Freq: ");
a=16000000.0 / divider[prescaler] / count;
Serial.print(a);
Serial.print(" Hz\t\tDuty: ");
Serial.print(middle / count * 100);
Serial.print(" %\t\tPeriod: ");
Serial.print(0.0000625 * divider[prescaler]*count);
Serial.print(" ms\t\tH-time: ");
Serial.print(0.0000625 * divider[prescaler]*middle);
Serial.print(" ms\t\tL-time: ");
Serial.print(0.0000625 * divider[prescaler]*(count - middle));
Serial.println(" ms");
if (prescaler > 1)
{
      prescaler--;
      delay(100);
}
   if (81<=a && a<=83)  //E音準確
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,HIGH);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
delay(1000);

}
if(a>=75 && a<=80)  //E音偏低
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,HIGH);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
delay(1000);
}

if(a>=84 && a<=90) //E音偏高
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,HIGH);
digitalWrite(led3B,LOW);
   delay(1000);
}

if (109<=a && a<=111 )  //A音準確
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,HIGH);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
delay(1000);

}
if(a>=105 && a<=108)  //A音偏低
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,HIGH);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
delay(1000);
}

if(a>=112 && a<=116) //A音偏高
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,HIGH);
digitalWrite(led3B,LOW);
   delay(1000);
}

  if(a>=145 && a<=150) //D音準確
  {
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,HIGH);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
  delay(1000);
  }

  if(a>=140 && a<=144) //D音偏低
  {
digitalWrite(led1G,LOW);
digitalWrite(led1R,HIGH);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
delay(1000);
  }
  if(a>=151 &&a<=155) //D音偏高
  {
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,HIGH);
digitalWrite(led3B,LOW);
   delay(1000);
  }

  if(a>=194 && a<=198) //G音準確
  {
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,HIGH);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
delay(1000);

if(a>=189 && a<=193)
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,HIGH);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
delay(1000);
}
if(a>=198 && a<=202)
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,HIGH);
digitalWrite(led3B,LOW);
delay(1000);
}
  }
else
{
digitalWrite(led1G,LOW);
digitalWrite(led1R,LOW);
digitalWrite(led1B,LOW);
digitalWrite(led2G,LOW);
digitalWrite(led2R,LOW);
digitalWrite(led2B,LOW);
digitalWrite(led3G,LOW);
digitalWrite(led3R,LOW);
digitalWrite(led3B,LOW);
}

}

測出來頻率卻是這樣，而且要彈很多次才會出現正常一點的頻率，大部分都是很奇怪的數字，每條弦都一樣
請問是哪裡出問題？
順便問這個程式輸出腳是2腳，要怎麼改成別的輸出點？

作者: pizg 時間: 2015-3-1 18:24
本帖最後由 pizg 於 2015-3-5 09:53 編輯

1.原始程式沒問題, 被你改到錯誤了。
2.因你的變數a型態設為int, 其值若超過32767會變成負值, 建議改成 unsigned int 或 double。
3.有雜訊, 會影響輸出結果。
4.輸入端沒有帶緩衝放大，所以輸入信號的幅值要接近5V才能測量。
5.這個程式使用到外部中斷0, 其輸出腳位在 D2, 所以你想改變到其他腳位輸出是沒辦法的。

歡迎光臨 Robofun 機器人論壇 (https://robofun.net/forum/)