MCP41010和LM567实现识别300-6000HZ的频率，附源代码

以下是使用MCP41010和LM567实现识别300-6000HZ频率的源代码：

#include <SPI.h>
#include <MCP41xxx.h>
#include < Tone.h>

#define POT_PIN 10
#define TONE_PIN 9

MCP41xxx digitalPot(POT_PIN);
Tone tone(TONE_PIN);

int lastFreq = 0;

void setup() {
  Serial.begin(9600);
  pinMode(TONE_PIN, OUTPUT);
  digitalPot.begin();
  digitalPot.setWiper(128);
}

void loop() {
  int freq = detectFrequency();
  if (freq > 0 && freq != lastFreq) {
    tone.play(freq);
    lastFreq = freq;
  } else if (freq == 0 && lastFreq != 0) {
    tone.stop();
    lastFreq = 0;
  }
}

int detectFrequency() {
  int freq = 0;
  int maxFreq = 0;
  int maxVal = 0;
  for (int i = 300; i <= 6000; i += 10) {
    int val = readLM567(i);
    if (val > maxVal) {
      maxFreq = i;
      maxVal = val;
    }
  }
  if (maxVal > 100) {
    freq = maxFreq;
  }
  return freq;
}

int readLM567(int freq) {
  int val = 0;
  tone.setFrequency(freq);
  delay(1);
  for (int i = 0; i < 100; i++) {
    val += analogRead(A0);
  }
  return val / 100;
}

代码中使用了MCP41010数字电位器控制信号的幅度，使其与LM567产生的信号频率匹配，然后通过Tone库播放声音。detectFrequency()函数用于检测频率，它通过调用readLM567()函数读取LM567产生的信号值。readLM567()函数使用Tone库产生频率，并通过模拟读取A0引脚读取信号值，最后返回平均值。