#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#include <SPI.h>

#include <Adafruit_GFX.h>

#include <Adafruit_SSD1306.h>  

#define OLED_RESET 4

Adafruit_SSD1306 display(OLED_RESET);  

#define LOGO16_GLCD_HEIGHT 16 //定义显示高度

#define LOGO16_GLCD_WIDTH  16 //定义显示宽度 

int measurePin = ; //Connect dust sensor to Arduino A0 pin

int ledPower = ; //Connect 3 led driver pins of dust sensor to Arduino D2

int samplingTime = ;

int deltaTime = ;

int sleepTime = ;

int dustVal=;

int i=;

float ppm=;

char s[];

float voltage=;

float dustdensity=;

float ppmpercf=;

void setup(){

  Serial.begin();

  pinMode(ledPower,OUTPUT);

 // 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)

  // init done

  i=;

  ppm=;

  display.clearDisplay();

}

void loop(){

  i=i+;

  digitalWrite(ledPower,LOW); // power on the LED

  delayMicroseconds(samplingTime);

  dustVal = analogRead(measurePin); // read the dust value

  ppm=ppm+dustVal;

  delayMicroseconds(deltaTime);

  digitalWrite(ledPower,HIGH); // turn the LED off

  delayMicroseconds(sleepTime);

  voltage=ppm/i*0.0049;

  dustdensity=0.17*voltage-0.1;

  ppmpercf=(voltage-0.0256)*;

  if(ppmpercf<) ppmpercf=; if(dustdensity<) dustdensity=; if(dustdensity>0.5)

  dustdensity=0.5;

  String dataString="";

  dataString+=dtostrf(voltage,,,s);

  dataString+="PM2.5 ---> ";

  dustdensity = dustdensity*;

  dataString+=dtostrf(dustdensity,,,s);

  dataString+="    -----> ";

  dataString+=dtostrf(ppmpercf,,,s);

  i=;

  ppm=;

   Serial.println(dustdensity);

  Serial.println(dataString);

  display.clearDisplay();

  display.setCursor(,);

  display.setTextSize();             //设置字体大小

  display.setTextColor(WHITE);        //设置字体白色

  display.print("dustDensity:");

  display.print(dataString);                //输出字符

  display.display();                  //显示以上 

delay();

}