Code

/*
 RXD,4
 TXD,5
 A,1
 B,0
 Q,13
 3.3,3.3
 D1,A5
 D2,A4
 GND,GND
 5V,5V

 */
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <BLINKER_PMSX003ST.h>
char recd_dat; // variable for receiving data from bluetooth serial port
int on_brd_led = 8; // On-board LED pin detail
int Al=1;
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display
#if defined(ESP32)
LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display
HardwareSerial pmsSerial(2);// UART1/Serial1 pins 16,17
#else
#include <SoftwareSerial.h>
SoftwareSerial pmsSerial(2,3);
#endif

BLINKER_PMSX003ST pms;

void setup() {
  pinMode(8, OUTPUT);
  pinMode(13, INPUT);
  lcd.init(); //initialize the lcd
  lcd.backlight(); //open the backlight
    Serial.begin(115200);
    Serial.println("\nStart");
pinMode(on_brd_led, OUTPUT);
digitalWrite(on_brd_led, LOW);
    pmsSerial.begin(9600);
    pms.begin(pmsSerial);
    //  pms.wakeUp();
    pms.setMode(PASSIVE);
        lcd.init(); //initialize the lcd
  lcd.backlight(); //open the backlight
}

void loop() {
    pms.request();



 if(Al == 1)
        {
          Serial.print("OK");
          }
          else
          {
            Serial.print("?");
            }
    if(13 == HIGH)
    {
      if(Al ==1 )
      {
        int Al = 2;
        delay (1000);
        }
     if(Al = 2)
        {
          int Al = 1;
          delay (1000);
          }
                }
ç

    lcd.clear();
    Serial.print("PM1.0(CF1)\t");
    Serial.print(pms.getPmCf1(1.0));
    Serial.println("ug/m3");
    Serial.print("PM2.5(CF1)\t");
    Serial.print(pms.getPmCf1(2.5));
    Serial.println("ug/m3");
    Serial.print("PM10(CF1)\t");
    Serial.print(pms.getPmCf1(10));
    Serial.println("ug/m3");
    Serial.print("PM1.0(ATO)\t");
    Serial.print(pms.getPmAto(1.0));
    Serial.println("ug/m3");
    Serial.print("PM2.5(ATO)\t");
    Serial.print(pms.getPmAto(2.5));
    Serial.println("ug/m3");
    Serial.print("PM10(ATO)\t");
    Serial.print(pms.getPmAto(10));
    Serial.println("ug/m3");
    Serial.print("  PCS0.3\t");
    Serial.print(pms.getPcs(0.3));
    Serial.println("pcs/0.1L");
    Serial.print("  PCS0.5\t");
    Serial.print(pms.getPcs(0.5));
    Serial.println("pcs/0.1L");
    Serial.print("  PCS1.0\t");
    Serial.print(pms.getPcs(1));
    Serial.println("pcs/0.1L");
    Serial.print("  PCS2.5\t");
    Serial.print(pms.getPcs(2.5));
    Serial.println("pcs/0.1L");
    Serial.print("  PCS5.0\t");
    Serial.print(pms.getPcs(5));
    Serial.println("pcs/0.1L");
    Serial.print("   PCS10\t");
    Serial.print(pms.getPcs(10));
    Serial.println("pcs/0.1L");
    Serial.print("Formalde\t");
    Serial.print(pms.getForm());
    Serial.println("ug/m3");
    Serial.print("Temperat\t");
    Serial.print(pms.getTemp());
    Serial.println("'C");
    Serial.print("Humidity\t");
    Serial.print(pms.getHumi());
    Serial.println("%");
    Serial.println();
        lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("PM2.5 ");
    lcd.print(pms.getPmAto(2.5));
    lcd.print("ug/m3");
    lcd.setCursor(25,2); // set the cursor to column 15, line 1
    lcd.print(pms.getTemp());
    lcd.print("C  ");
    lcd.print(pms.getHumi());
    lcd.print("%");
    delay(1000);
    }