code arduino

#include <Wire.h>
// Include the DHT11 library for interfacing with the sensor.
#include <DHT11.h>

// Create an instance of the DHT11 class.
// - For Arduino: Connect the sensor to Digital I/O Pin 2.
// - For ESP32: Connect the sensor to pin GPIO2 or P2.
// - For ESP8266: Connect the sensor to GPIO2 or D4.
DHT11 dht11(5);

#include <Adafruit_NeoPixel.h>
// Which pin on the Arduino is connected to the NeoPixels?
#define PIN 8 // On Trinket or Gemma, suggest changing this to 1

// How many NeoPixels are attached to the Arduino?
#define NUMPIXELS 4 // Popular NeoPixel ring size

// When setting up the NeoPixel library, we tell it how many pixels,
// and which pin to use to send signals. Note that for older NeoPixel
// strips you might need to change the third parameter -- see the
// strandtest example for more information on possible values.
Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

int temperature = 0;
int humidity = 0;


void setup() {
  // put your setup code here, to run once:
  Wire.begin(8);                // join I2C bus with address #8
  Wire.onReceive(receiveEvent); // register event
  Wire.onRequest(requestEvent); // register event

  pixels.begin(); // INITIALIZE NeoPixel strip object (REQUIRED)
  pixels.clear(); //CLEARS LEDS
  pixels.setBrightness(100); //(0-255) Brightness
  pixels.show(); //SENDS THE QUEUED COMMANDS

  
  Serial.begin(9600);           // start serial for output
}

void loop() {
  // put your main code here, to run repeatedly:
      // Attempt to read the temperature and humidity values from the DHT11 sensor.
    int result = dht11.readTemperatureHumidity(temperature, humidity);

    // Check the results of the readings.
    // If the reading is successful, print the temperature and humidity values.
    // If there are errors, print the appropriate error messages.
    if (result == 0) {
        Serial.print("Temperature: ");
        Serial.print(temperature);
        Serial.print(" °C\tHumidity: ");
        Serial.print(humidity);
        Serial.println(" %");
    } else {
        // Print error message based on the error code.
        Serial.println(DHT11::getErrorString(result));
    }
}

// function that executes whenever data is received from master
// this function is registered as an event, see setup()
void receiveEvent(int howMany) {
  int c = 0;
  while (Wire.available()) { // loop through all but the last
    c = Wire.read(); // receive byte as a character
    Serial.println(c);         // print the character
  }

  if(c == 1)
  {
    pixels.setPixelColor(0,255,0,0);
  }
  else if(c ==2)
  {
    pixels.setPixelColor(0,0,0,0);
  }
  pixels.show();
}

// function that executes whenever data is requested by master
// this function is registered as an event, see setup()
void requestEvent() {
  Wire.write(temperature);
  Wire.write(humidity);
}