灰尘传感器PPD42问题如何解决？

我正在做我的最终学位项目，但我被灰尘传感器困住了。
在我的项目中，我必须使用 ESP12-E NodeMcu 板和三个传感器，温度和湿度 (DHT22)、VOC (CCS811) 和粒子 (PPD42)。
当我仅使用 PPD42 传感器时，返回值是正确的（范围 0 - 1000），但是当我连接三个传感器 + wifi 时，这些值要么为 0，要么太大（+1,000,000）。
你可以帮帮我吗？
代码：全选#include
#include
#include
#include
#include
#include
#include
#include

#include \"SparkFunCCS811.h\" //Click here to get the library: http://librarymanager/All#SparkFun_CCS811
#define CCS811_ADDR 0x5A //Alternate I2C Address

//SEND_DATA
const char* serverName = \"http://****\";
String serial_numb = \"****\";
//SEND_DATA

//CCS811
CCS811 myCCS811(CCS811_ADDR);
float CCS811_CO2 = 0;
float CCS811_tVOC = 0;
//CCS811

//for LED status
#include
ticker ticker;

//PPD42
//Set variables for PM10 and PM2,5 readings
unsigned long starttime;

unsigned long triggerOnP1;
unsigned long triggerOffP1;
unsigned long pulseLengthP1;
unsigned long durationP1;
boolean valP1 = HIGH;
boolean triggerP1 = false;

unsigned long triggerOnP2;
unsigned long triggerOffP2;
unsigned long pulseLengthP2;
unsigned long durationP2;
boolean valP2 = HIGH;
boolean triggerP2 = false;

float ratioP1 = 0;
float ratioP2 = 0;
unsigned long sampletime_ms = 30000;
float countP1;
float countP2;
float concLarge = 0;
float concSmall = 0;
//PPD42

//DHT22
#define PIN_CONEXION D3// A cuál pin está conectado el lector
#define TIPO_SENSOR DHT22 // Puede ser DHT11 también
DHT dht(PIN_CONEXION, TIPO_SENSOR);
float DHThumid, DHTtempC = 0;
//DHT22
  
#ifndef LED_BUILTIN
#define LED_BUILTIN 13 // ESP32 DOES NOT DEFINE LED_BUILTIN
#endif

int LED = LED_BUILTIN;

void tick()
{
  //toggle state
  digitalWrite(LED, !digitalRead(LED));     // set pin to the opposite state
}

//gets called when WiFiManager enters configuration mode
void configModeCallback (WiFiManager *myWiFiManager) {
  Serial.println(\"Entered config mode\");
  Serial.println(WiFi.softAPIP());
  //if you used auto generated SSID, print it
  Serial.println(myWiFiManager->getConfigPortalSSID());
  //entered config mode, make led toggle faster
  ticker.attach(0.2, tick);
}

void setup() {
  wifi();
  setup_CSS811();
}

void wifi() {
  WiFi.mode(WIFI_STA); // explicitly set mode, esp defaults to STA+AP
  // put your setup code here, to run once:
  Serial.begin(115200);
  
  //set led pin as output
  pinMode(LED, OUTPUT);
  // start ticker with 0.5 because we start in AP mode and try to connect
  ticker.attach(0.6, tick);

  //WiFiManager
  //Local intialization. Once its business is done, there is no need to keep it around
  WiFiManager wm;
  //reset settings - for testing
  // wm.resetSettings();

  //set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode
  wm.setAPCallback(configModeCallback);

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  \"AutoConnectAP\"
  //and goes into a blocking loop awaiting configuration
  if (!wm.autoConnect(\"wifi\")) {
    Serial.println(\"failed to connect and hit timeout\");
    //reset and try again, or maybe put it to deep sleep
    ESP.restart();
    delay(1000);
  }

  //if you get here you have connected to the WiFi
  Serial.println(\"connected...yeey :)\");
  ticker.detach();
  //keep LED on
  digitalWrite(LED, LOW);
}

void loop() {
  run_PPD42();
  run_CSS811();
  senddata();
  delay(30000);
}

void setup_CSS811()
{
  Serial.begin(115200);
  Serial.println();
  Serial.println(\"Apply DHT22 data to CCS811 for compensation.\");

  Wire.begin();

  //This begins the CCS811 sensor and prints error status of .beginWithStatus()
  CCS811Core::CCS811_Status_e returnCode = myCCS811.beginWithStatus();
  Serial.print(\"CCS811 begin exited with: \");
  Serial.println(myCCS811.statusString(returnCode));
  //Calling .begin() causes the settings to be loaded
  delay(10); //Make sure sensor had enough time to turn on. BME280 requires 2ms to start up.
  dht.begin();
}
void run_CSS811()
{
  //Check to see if data is available
  if (myCCS811.dataAvailable())
  {
    //Calling this function updates the global tVOC and eCO2 variables
    myCCS811.readAlgorithmResults();
    //printInfoSerial fetches the values of tVOC and eCO2
    printInfoSerial();

    DHTtempC = dht.readTemperature();
    DHThumid = dht.readHumidity();
   
    Serial.print(\"Applying new values (ªC, Humedad): \");
    Serial.print(DHTtempC);
    Serial.print(\",\");
    Serial.println(DHThumid);
    Serial.println();

    //This sends the temperature data to the CCS811
    myCCS811.setEnvironmentalData(DHThumid, DHTtempC);
  }
  else if (myCCS811.checkForStatusError())
  {
    //If the CCS811 found an internal error, print it.
    printSensorError();
  }

}

void printInfoSerial()
{
  //getCO2() gets the previously read data from the library
  Serial.println(\"CCS811 data:\");
  Serial.print(\" CO2 concentration : \");
  CCS811_CO2 = myCCS811.getCO2();
  Serial.print(CCS811_CO2);
  Serial.println(\" ppm\");

  //getTVOC() gets the previously read data from the library
  Serial.print(\" TVOC concentration : \");
  CCS811_tVOC = myCCS811.getTVOC();
  Serial.print(CCS811_tVOC);
  Serial.println(\" ppb\");

  Serial.println(\"DHT22 data:\");
  Serial.print(\" Temperatura: \");
  Serial.print(dht.readTemperature(), 2);
  Serial.println(\" ºC\");

  Serial.print(\" Humedad: \");
  Serial.print(dht.readHumidity(), 2);
  Serial.println(\"%\");

  Serial.println();
}

void printSensorError()
{
  uint8_t error = myCCS811.getErrorRegister();

  if (error == 0xFF) //comm error
  {
    Serial.println(\"Failed to get ERROR_ID register.\");
  }
  else
  {
    Serial.print(\"Error: \");
    if (error & 1 << 5)
      Serial.print(\"HeaterSupply\");
    if (error & 1 << 4)
      Serial.print(\"HeaterFault\");
    if (error & 1 << 3)
      Serial.print(\"MaxResistance\");
    if (error & 1 << 2)
      Serial.print(\"MeasModeInvalid\");
    if (error & 1 << 1)
      Serial.print(\"ReadRegInvalid\");
    if (error & 1 << 0)
      Serial.print(\"MsgInvalid\");
    Serial.println();
  }
}

void run_PPD42()
{
  valP1 = digitalRead(14);
  valP2 = digitalRead(12);
  
  if(valP1 == LOW && triggerP1 == false){
    triggerP1 = true;
    triggerOnP1 = micros();
  }
  
  if (valP1 == HIGH && triggerP1 == true){
      triggerOffP1 = micros();
      pulseLengthP1 = triggerOffP1 - triggerOnP1;
      durationP1 = durationP1 + pulseLengthP1;
      triggerP1 = false;
  }
  
    if(valP2 == LOW && triggerP2 == false){
    triggerP2 = true;
    triggerOnP2 = micros();
  }
  
    if (valP2 == HIGH && triggerP2 == true){
      triggerOffP2 = micros();
      pulseLengthP2 = triggerOffP2 - triggerOnP2;
      durationP2 = durationP2 + pulseLengthP2;
      triggerP2 = false;
  }
  
   
    if ((millis() - starttime) > sampletime_ms) {
      
      ratioP1 = durationP1/(sampletime_ms*10.0);  // Integer percentage 0=>100
      ratioP2 = durationP2/(sampletime_ms*10.0);
      countP1 = 1.1*pow(ratioP1,3)-3.8*pow(ratioP1,2)+520*ratioP1+0.62;
      countP2 = 1.1*pow(ratioP2,3)-3.8*pow(ratioP2,2)+520*ratioP2+0.62;
      float PM10count = countP2;
      float PM25count = countP1 - countP2;
      
      // first, PM10 count to mass concentration conversion
      double r10 = 2.6*pow(10,-6);
      double pi = 3.14159;
      double vol10 = (4.0/3.0)*pi*pow(r10,3);
      double density = 1.65*pow(10,12);
      double mass10 = density*vol10;
      double K = 3531.5;
      concLarge = (PM10count)*K*mass10;
      
      // next, PM2.5 count to mass concentration conversion
      double r25 = 0.44*pow(10,-6);
      double vol25 = (4.0/3.0)*pi*pow(r25,3);
      double mass25 = density*vol25;
      concSmall = (PM25count)*K*mass25;
      

      Serial.print(\"PM10=\");
      Serial.print(concLarge);
      Serial.print(\", PM25=\");
      Serial.println(concSmall);
   
      durationP1 = 0;
      durationP2 = 0;
      starttime = millis();
    }
}

void senddata(){
//Check WiFi connection status
  if(WiFi.status()== WL_CONNECTED){
    HTTPClient http;
   
    // Your Domain name with URL path or IP address with path
    http.begin(serverName);
   
    // Specify content-type header
    http.addHeader(\"Content-Type\", \"application/x-www-form-urlencoded\");
   
    // Prepare your HTTP POST request data
    String httpRequestData = \"serial_numb=\" + serial_numb + \"&DHTtempC=\" + String(DHTtempC)
                          + \"&DHThumid=\" + String(DHThumid) + \"&CCS811_CO2=\" + String(CCS811_CO2) + \"&CCS811_tVOC=\" + String(CCS811_tVOC) + \"&PM10=\" + String(concLarge) + \"&PM25=\" + String(concSmall) + \"\";
    Serial.print(\"httpRequestData: \");
    Serial.println(httpRequestData);
   
   
    int httpResponseCode = http.POST(httpRequestData);
     
   
        
    if (httpResponseCode>0) {
      Serial.print(\"HTTP Response code: \");
      Serial.println(httpResponseCode);
    }
    else {
      Serial.print(\"Error code: \");
      Serial.println(httpResponseCode);
    }
    // Free resources
    http.end();
  }
  else {
    Serial.println(\"WiFi Disconnected\");
  }
}