/*
【Arduino】168种传感器模块系列实验（资料代码+仿真编程+图形编程）
实验九十三：0.96寸I2C IIC通信128*64显示器 OLED液晶屏模块
安装驱动库：工具—管理库—搜索“U8glib”-下载-安装
实验接线：A4---SDA, A5---SCL
项目二：测试之1-100循环显示数字
*/
#include "U8glib.h"  //加载显示库文件
U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_NONE);  // I2C / TWI 实例化
void setup() {
}
void loop() {
  for(int i=1;i<101;i++){
    u8g.firstPage();  //一下是显示实现部分
  do {
  u8g.setFont(u8g_font_fub30);
  //设置字体和自号，目前测试字号有fub14,17,20,30
  u8g.setPrintPos(0, 50); //显示的位置
  u8g.print(i);//显示变量i的值
  u8g.setFont(u8g_font_fub14);//设置字体和自号
  u8g.setPrintPos(95, 50); //显示的位置
  u8g.print("cm");//显示cm字样
  }
  while( u8g.nextPage() );
  delay(100);//显示的时间间隔。
  }
}

#include <U8g2lib.h>                                       //u8g2库
U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0,SCL,SDA); //配置构造函数      
int a=66;                                                  //定义变量a=66
void setup() 
{
    u8g2.begin();                                          //启动u8g2驱动程序
    u8g2.clearBuffer();                                    //清空显示屏缓存
}
void loop() 
{
    face();                                                //调用函数，显示图案
    delay(1000);                                           //持续一秒钟
    heart();                                               //调用函数，显示英文字母和图案
    delay(1000);                                           //持续一秒钟
    letter(a);                                             //调用函数，显示中文和变量
    delay(1000);                                           //持续一秒钟
}
void face()
{
    u8g2.clearBuffer();                                    //清空显示屏缓存
    
    u8g2.drawCircle(56,40,8,U8G2_DRAW_LOWER_LEFT);         //画四分之一圆，圆心坐标（56,44），半径8
    u8g2.drawCircle(56,40,8,U8G2_DRAW_LOWER_RIGHT);        //画四分之一圆
    u8g2.drawCircle(72,40,8,U8G2_DRAW_LOWER_LEFT);         //画四分之一圆
    u8g2.drawCircle(72,40,8,U8G2_DRAW_LOWER_RIGHT);        //画四分之一圆
    u8g2.drawCircle(56,41,8,U8G2_DRAW_LOWER_LEFT);         //加粗画四分之一圆
    u8g2.drawCircle(56,41,8,U8G2_DRAW_LOWER_RIGHT);        //加粗画四分之一圆
    u8g2.drawCircle(72,41,8,U8G2_DRAW_LOWER_LEFT);         //加粗画四分之一圆
    u8g2.drawCircle(72,41,8,U8G2_DRAW_LOWER_RIGHT);        //加粗画四分之一圆
    u8g2.drawLine(40,18,20,30);                            //画斜线，两端点坐标分别是（40，18）（20,30）
    u8g2.drawLine(88,18,108,30);                           //画斜线
    u8g2.drawLine(40,17,20,29);                            //加粗画斜线
    u8g2.drawLine(88,17,108,29);                           //加粗画斜线
    
    u8g2.sendBuffer();                                     //加载以上内容
}
  void heart()
{
    u8g2.clearBuffer();                                    //清空显示屏缓存
    
    u8g2.setFont(u8g2_font_open_iconic_human_2x_t);        // 设置字体
    u8g2.drawGlyph(58,30,66);                              // 画心，符号左下角坐标为（58,36），符号编号为66
    u8g2.setFont(u8g2_font_unifont_t_chinese2);            //设置字体
    u8g2.drawUTF8(58+20,30,"ZFY");                         //显示英文，左下角位置坐标为（78，30）
    u8g2.drawUTF8(58-14-16,30,"JHR");                      //显示英文，左下角位置坐标为（28，30）    
    
    u8g2.sendBuffer();                                     // 加载以上内容
}
  void letter(int a)
{   
    u8g2.clearBuffer();                                    //清空显示屏缓存
    
    //int8_t a=u8g2.getMaxCharHeight();                      //获取最大高度
    //int8_t b=u8g2.getMaxCharWidth();                       //获取最大宽度
    
    u8g2.setFont(u8g2_font_unifont_t_chinese2);            //设置字体
    u8g2.drawUTF8(20,17,"智能检测系统");                    //显示文字，左下角位置坐标为（20，17）
    u8g2.drawUTF8(50,34,"：");                             //显示:，左下角坐标为（50,34）
    u8g2.drawUTF8(0,34,"位移为:");
    u8g2.setCursor(64,34);                                 //设置将要打印变量的左下角坐标
    u8g2.drawUTF8(0,34,"位移为:");
    u8g2.print(a);                                         //打印变量a
     
    u8g2.sendBuffer();                                     // 加载以上内容
  }

#include <Wire.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>

 

#define OLED_RESET 4

Adafruit_SSD1306 display(OLED_RESET);

 

#define NUMFLAKES 10

#define XPOS 0

#define YPOS 1

#define DELTAY 2

 

#define LOGO16_GLCD_HEIGHT 16

#define LOGO16_GLCD_WIDTH  16

 

#if (SSD1306_LCDHEIGHT != 64)

#error("Height incorrect, please fix Adafruit_SSD1306.h!");

#endif

/*-----显示文字一，把代码放入数组中---*/

static const uint8_t PROGMEM photo_128x64[] = { 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x9f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xdf,0xff,0xfd,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xdf,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xdd,0xfe,0xeb,0xbb,0xd3,0xc3,0x87,0x6d,0xfc,0x63,0xc2,0x3f,0xff,0xff,0xff,0xff,0xd9,0xb6,0x6b,0xbb,0xcd,0x9d,0xbb,0x6d,0xf3,0xcd,0xd9,0xbf,0xff,0xff,0xff,0xff,0xdb,0xb7,0x6d,0x57,0xde,0xdd,0xbb,0x9d,0xf7,0xde,0xdd,0xbf,0xff,0xff,0xff,0xff,0xea,0xb5,0x5d,0x57,0xde,0xdd,0xbb,0x9d,0xf7,0xde,0xd9,0x9f,0xff,0xff,0xff,0xff,0xe6,0xf5,0xdd,0x57,0xde,0xdd,0xbb,0x1d,0xf7,0xde,0xdd,0x9f,0xff,0xff,0xff,0xff,0xe6,0x79,0x9c,0xce,0xcd,0xdd,0xbb,0x6d,0xbb,0xcd,0xdd,0x9f,0xff,0xff,0xff,0xff,0xf7,0x7b,0xbe,0xee,0xd3,0xfd,0x87,0xed,0xbc,0xe3,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xdf,0xff,0xbf,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xdf,0xff,0xbf,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xbf,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0x3e,0x67,0xfe,0xe7,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xfe,0x3e,0x71,0xf0,0x06,0x00,0x3f,0xff,0xff,0xf8,0x03,0xfc,0xff,0x8f,0x80,0x1f,0xfe,0x7e,0x78,0xfe,0x3f,0x8e,0x3f,0xff,0xff,0xf8,0x00,0xfc,0xff,0xcf,0x80,0x07,0xfc,0xfe,0x7c,0x7e,0x7f,0xff,0x3f,0xff,0xff,0xf9,0xf8,0x7c,0xff,0x8f,0x8f,0xc3,0xfc,0xfe,0x7e,0xfe,0x7f,0x3f,0x3f,0xff,0xff,0xf9,0xfe,0x7c,0xff,0x8f,0x8f,0xe3,0xf9,0xfe,0x7f,0xfe,0x7f,0x3e,0x7f,0xff,0xff,0xf9,0xfe,0x3c,0xff,0xcf,0x8f,0xf3,0xf1,0xfe,0x7e,0x7e,0xff,0x3e,0x7f,0xff,0xff,0xf9,0xfe,0x3c,0xff,0xcf,0x8f,0xf3,0xe1,0xfe,0x00,0x7c,0xff,0x3e,0x7f,0xff,0xff,0xf9,0xfe,0x3c,0xff,0x8f,0x8f,0xf3,0xc1,0x80,0x03,0xfc,0xff,0x3e,0x7f,0xff,0xff,0xf9,0xfe,0x7c,0xff,0xcf,0x8f,0xf3,0x89,0x80,0x7f,0xf8,0x07,0x7e,0x7f,0xff,0xff,0xf9,0xfc,0x7c,0x00,0x0f,0x8f,0xe3,0x99,0xfe,0x7f,0xf8,0xc6,0x7e,0x7f,0xff,0xff,0xf8,0xf0,0x7c,0x00,0x0f,0x8f,0x87,0xb9,0xff,0x3f,0xf8,0xe6,0x00,0x0f,0xff,0xff,0xf8,0x00,0xfc,0xff,0x8f,0x80,0x0f,0xf9,0xff,0x3f,0xf0,0xe7,0xb9,0x8f,0xff,0xff,0xf8,0x07,0xfc,0xff,0x8f,0x80,0x3f,0xf9,0xff,0x3f,0xf0,0xe7,0xff,0xcf,0xff,0xff,0xf9,0xff,0xfc,0xff,0xcf,0x8f,0xff,0xf9,0xff,0x3f,0xf4,0xe7,0xff,0xcf,0xff,0xff,0xf9,0xff,0xfc,0xff,0xcf,0x8f,0xff,0xf9,0xff,0x1f,0xfc,0xe7,0xff,0xcf,0xff,0xff,0xf9,0xff,0xfc,0xff,0x8f,0x8f,0xff,0xf9,0xff,0x9f,0xfc,0xe4,0x00,0xcf,0xff,0xff,0xf9,0xff,0xfc,0xff,0xcf,0x8f,0xff,0xf9,0xff,0x9f,0x3c,0xe4,0x00,0x9f,0xff,0xff,0xf9,0xff,0xfc,0xff,0xcf,0x8f,0xff,0xf9,0xff,0x8f,0x3c,0x47,0xff,0x9f,0xff,0xff,0xf9,0xff,0xfc,0xff,0xcf,0x8f,0xff,0xf9,0xff,0xcf,0x3c,0x07,0xff,0x9f,0xff,0xff,0xf9,0xff,0xfc,0xff,0xcf,0x8f,0xff,0xf9,0xff,0xc7,0x7c,0xff,0xff,0x9f,0xff,0xff,0xf9,0xff,0xfc,0xff,0xcf,0xcf,0xff,0xf9,0xff,0xe0,0x7c,0xff,0xff,0x3f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xf9,0xff,0xf0,0x7d,0xff,0xf8,0x3f,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xf9,0xff,0xfc,0xff,0xff,0xfd,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff };

0void setup()   {                

  Serial.begin(9600);

  delay(500);

  // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3D (for the 128x64)

}

void loop() {

  test_SSD1306();

}

void test_SSD1306(void){

  display.clearDisplay();   // clears the screen and buffer

  display.drawBitmap(0,0,photo_128x64,128,62,WHITE);

  display.display();

  delay(2000);

}

/*
Arduino Frequency meter
Ansifa
2013/1/5
*/
int divider[6] = {0, 1, 8, 64, 256, 1024};
int prescaler = 5;
double count = 0;
double middle = 0;
char x = 0;
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);
}
void loop()
{
    Serial.print("Freq: ");
    Serial.print(16000000.0 / divider[prescaler] / count);
    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(200);
    }
    delay(100);
}

int microphonePin = 2; // 麦克风数字输入引脚
volatile unsigned long pulseStartTime; // 脉冲起始时间
volatile unsigned long pulseEndTime; // 脉冲结束时间
volatile unsigned long pulseDuration; // 脉冲持续时间
void setup() {
  Serial.begin(9600);
  pinMode(microphonePin, INPUT);
  attachInterrupt(digitalPinToInterrupt(microphonePin), handleInterrupt, RISING);
}
void loop() {
  if (pulseDuration > 0) {
    double frequency = 1000000 / pulseDuration; // 计算声音频率
    Serial.print("Frequency: ");
    Serial.print(frequency);
    Serial.println(" Hz");
    pulseDuration = 0; // 重置脉冲持续时间
  }
}
void handleInterrupt() {
  if (digitalRead(microphonePin) == HIGH) {
    pulseStartTime = micros(); // 记录脉冲开始时间
  } else {
    pulseEndTime = micros(); // 记录脉冲结束时间
    pulseDuration = pulseEndTime - pulseStartTime; // 计算脉冲持续时间
  }
}

在该示例代码中，我们使用attachInterrupt函数将中断服务程序handleInterrupt绑定到麦克风数字输入引脚上。每次中断发生时，handleInterrupt函数会记录下当前的时间（即脉冲开始或结束时间），并计算出两次脉冲之间的时间差（即脉冲持续时间）。在loop函数中，我们可以通过计算声音频率来实现声音频率的识别。需要注意的是，由于中断服务程序处理速度较快，因此该方法可以实现更高精度的声音频率识别。

#define SAMPLE_SIZE 10 // 移动平均滤波器采样点数
int analogPin = A0; // 输入引脚
int samples[SAMPLE_SIZE]; // 存储采样值的数组
int sampleIndex = 0; // 当前采样值的索引
float total = 0; // 所有采样值的和
void setup() {
  Serial.begin(9600);
}
void loop() {
  int sensorValue = analogRead(analogPin); // 读取输入信号
  total -= samples[sampleIndex]; // 减去最旧的采样值
  samples[sampleIndex] = sensorValue; // 将新的采样值存储到数组中
  total += sensorValue; // 加上新的采样值
  sampleIndex++; // 增加索引
  if (sampleIndex >= SAMPLE_SIZE) {
    sampleIndex = 0; // 索引循环
  }
  float average = total / float(SAMPLE_SIZE); // 计算平均值
  Serial.println(average); // 输出平均值
  delay(10); // 降低采样率，提高计算精度
}

10次平均处理。

#include <SPI.h> // 加载SPI库
#include <Wire.h> // 加载Wire库
#include <Adafruit_GFX.h> // 加载Adafruit_GFX库
#include <Adafruit_SSD1306.h> // 加载Adafruit_SSD1306库
 
int SensorINPUT = 2;      //连到中断0，也就是数字引脚`
unsigned long time1,time2,time_;
float pl;
 
// 定义 OLED屏幕的分辨率
Adafruit_SSD1306 display = Adafruit_SSD1306(128, 64, &Wire);
 
void setup() {
  Serial.begin(9600); // 设置串口波特率
  Serial.println("OLED FeatherWing test"); // 串口输出
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C); // 设置OLED的I2C地址
  pinMode(SensorINPUT, INPUT);  //设置引脚输入（默认就是输入）
  attachInterrupt(0, blink, FALLING);   //下降沿触发，触发中断0，调用blink函数
}
 
void loop() {
 
  if(pl>50 && pl<2000){
 
   
  display.clearDisplay(); // 清空屏幕
  display.setTextSize(2); // 设置字体大小
  display.setTextColor(SSD1306_WHITE); // 设置字体颜色
  display.setCursor(0,0); // 设置开始显示文字的坐标
  display.println("frequency:"); // 输出的字符
  display.setTextSize(3); // 设置字体大小
  display.setCursor(0,16); // 设置开始显示文字的坐标
  display.println(pl); // 输出的字符
  display.setCursor(80,40); // 设置开始显示文字的坐标
  display.println("Hz"); // 输出的字符
  display.display(); // 使更改的显示生效
  delay(200);
   }
}
void blink() {               //中断函数blink()
  time1 = time2;    //保留上一次数值
  time2 = millis(); //读取现在的时间数值
  time_ = time2 - time1;   //计数两个下降沿之间的所经过的时间
  pl=1000.0/time_;     //计算频率  pl = 1/(time_/1000)  时间的倒数
  Serial.println("----");
  Serial.print(pl);     //打印数值
  Serial.println("----");
}