├── arduinoFFT.zip
├── Adafruit_SSD1306-master.zip
└── fftoled2.ino


/arduinoFFT.zip:
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https://raw.githubusercontent.com/JayeGu/FFT-Arduino-OLED/HEAD/arduinoFFT.zip


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/Adafruit_SSD1306-master.zip:
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https://raw.githubusercontent.com/JayeGu/FFT-Arduino-OLED/HEAD/Adafruit_SSD1306-master.zip


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/fftoled2.ino:
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 1 | /**************************
 2 |  * 作者：顾加1
 3 |  * 日期：2022年1月19日
 4 |  * copy后记得一键三连
 5 |  */
 6 | #include "arduinoFFT.h"
 7 | #include <Adafruit_SSD1306.h>
 8 | #define samples 64 //采样点数，2的N次幂
 9 | #define halfsamples samples/2
10 | #define NumofCopy halfsamples*sizeof(double)
11 | #define Interval 128/(halfsamples)
12 | Adafruit_SSD1306 display(100);
13 | arduinoFFT FFT = arduinoFFT();
14 | 
15 | double vReal[samples];
16 | double vImag[samples];
17 | double vTemp[halfsamples];
18 | 
19 | void setup() {
20 |   setP32();  //设置32分频,加快AD采样
21 |   display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
22 |   display.clearDisplay();
23 |   display.setTextSize(1);
24 |   display.setTextColor(WHITE);
25 | }
26 | 
27 | void loop() {
28 | //  Serial.println("start:"+String(micros()));
29 |   for(int i=0;i<samples;i++)
30 |   {
31 |     vReal[i]=analogRead(A0)-512;  //采样
32 |     vImag[i] = 0.0;
33 |   }
34 | //  Serial.println("end:"+String(micros()));
35 |   display.clearDisplay();
36 |   FFT.Windowing(vReal, samples, FFT_WIN_TYP_HAMMING, FFT_FORWARD);//加窗
37 |   FFT.Compute(vReal, vImag, samples, FFT_FORWARD);  //计算fft
38 |   FFT.ComplexToMagnitude(vReal, vImag, samples);  //计算幅度
39 |   for(int i=0;i<halfsamples;i++)
40 |   {
41 |     display.drawPixel(i*Interval,vTemp[halfsamples-i-1]*0.007+1, WHITE); //显示
42 |     display.drawLine(i*Interval, 0, i*Interval,vReal[halfsamples-i-1]*0.007, WHITE);
43 |   }
44 |   display.display();
45 |   memcpy(vTemp, vReal, NumofCopy);
46 |   delay(20);  //改为128点时可以注释掉，防止刷新太慢
47 | }
48 | void setP32()//设置32分频
49 | {
50 |   ADCSRA|=(1<<ADPS2);  
51 |   ADCSRA&=~(1<<ADPS1);
52 |   ADCSRA|=(1<<ADPS0);
53 | }
54 | void setP16( ) {  //设置16分频，不建议
55 |   ADCSRA |=  (1 << ADPS2);   // 1
56 |   ADCSRA &=  ~(1 << ADPS1);  // 0
57 |   ADCSRA &=  ~(1 << ADPS0);  // 0
58 | }
59 | 


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