• At first, we need to prepare the environment for ESP32 development board programming in arduino, and you can cheak this guide.
• This is a library for our Monochrome OLEDs based on SSD1306 drivers.

#include <Adafruit_SSD1306.h>

• This library allows you to communicate with I2C devices (the OLED is connected by I2C)

#include <Wire.h>

• The Adafruit_GFX library provides a common syntax and set of graphics functions for all of our LCD and OLED displays and LED matrices.

#include <Adafruit_GFX.h>

• An Arduino library for the DHT series.

#include <DHT.h>

• Difine your pins, this determines which pin of the board your device should be connected to.

#define DEBUG true
#define LTE_RESET_PIN 6
#define LTE_PWRKEY_PIN 5
#define pinInterrupt A0
#define DHTPIN 2
#define LIGHT

• Configuring OLEDs.

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET -1    // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3c
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

• Initialise your devices so that they work properly

erialUSB.begin(115200);
    Serial1.begin(115200);

    pinMode(LTE_RESET_PIN, OUTPUT);
    digitalWrite(LTE_RESET_PIN, LOW);
  
    pinMode(LTE_PWRKEY_PIN, OUTPUT);
    digitalWrite(LTE_RESET_PIN, LOW);
    delay(100);
    digitalWrite(LTE_PWRKEY_PIN, HIGH);
    delay(3000);
    digitalWrite(LTE_PWRKEY_PIN, LOW);

   

    Wire.begin();
    if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
        SerialUSB.println(F("SSD1306 allocation failed"));
        for (;;); // Don't proceed, loop forever
    }
    else{
      SerialUSB.println(F("SSD1306 allocation successful"));
    }
    display.clearDisplay();
    delay(1000);

    pinMode(pinInterrupt, INPUT_PULLUP);
    attachInterrupt(digitalPinToInterrupt(pinInterrupt), onChange, FALLING); 
    dht.begin();
    pinMode(LIGHT, INPUT);

• Detecting wind speed

void wind_speed()
    {
      lastDebounceTime = millis();
      Count = 0;
      while(!((millis() - lastDebounceTime) > debounceDelay));
      if ((millis() - lastDebounceTime) > debounceDelay)
      {
    
    
        speed_value = Count * 8.75 * 0.01;
         SerialUSB.print("Wind speed:");
         SerialUSB.print(speed_value);    
         SerialUSB.println("m/s");
        Count = 0;
      }
    }
    
    void onChange()
    {
      if (digitalRead(pinInterrupt) == LOW)
        Count++;
    }

• Detecting light intensity

void light_str()
    {
       lastDebounceTime = millis();
      count_light = 0;
      while((millis() - lastDebounceTime) < debounceDelay)
      {
          delay(5);
          if (digitalRead(LIGHT) == 0){
            count_light++;
          }
      }
          if(count_light>100)
          {
            SerialUSB.println("Strong ultraviolet ray");
            light_intensity =light_intensity +"Strong ultraviolet ray";
            light_index = light_index + "1";
          }
          else
          {
            SerialUSB.println("Weak ultraviolet ray");
            light_intensity =light_intensity + "Weak ultraviolet ray";
            light_index = light_index + "0";
          }
          count_light = 0;
      }

• Detecting temperature and humidity

float humidity_value = dht.readHumidity();
   float temperature_value = dht.readTemperature();
   SerialUSB.print("Humidity:");
   SerialUSB.print(humidity_value);
   SerialUSB.println(" %");
   SerialUSB.print("Temperature:");
   SerialUSB.print(temperature_value);
   SerialUSB.println(" C");

• OLED display information

display.clearDisplay();
    display.setCursor(1, 5);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.println("Humidity:" + String(humidity_value) + " %" );
    display.setCursor(1, 15);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.println("Temperature:" + String(temperature_value) + " C" );
    display.setCursor(1, 25);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.println("Wind speed:" + String(speed_value) + "m/s");
    display.setCursor(1, 35);
    display.setTextColor(WHITE);
    display.setTextSize(1);
    display.println(light_l);
    display.display();