Control of room conditions for healthy work

#include <Wire.h>
#include <DHT.h>
#include <Adafruit_SGP30.h>
#include <rgb_lcd.h>
#include "Adafruit_NeoPixel.h"

#define LED_COUNT_NP2         30

DHT dht(A0, DHT11);
Adafruit_SGP30 sgp30;
rgb_lcd lcdRgb;
Adafruit_NeoPixel Neopixel_2(LED_COUNT_NP2, 2, NEO_GRB + NEO_KHZ800);

void serial_setupConnection(int baudrate) {
  Serial.begin(baudrate);
  while (!Serial) {
    Serial.println("En attente de l'ouverture du port série...");
    delay(1000);
  }
  Serial.println("Port série activé. Baudrate: " + String(baudrate));
}

uint16_t sgp30_readCO2() {
  if (!sgp30.IAQmeasure()) {
    Serial.println("Measurement failed");
    return 0;
  }
  else return sgp30.eCO2;
}

void showAllNeopixel(Adafruit_NeoPixel neoPx, uint8_t ledCount, uint8_t r, uint8_t g, uint8_t b) {
  for (int i=0; i<ledCount; i++) {
    neoPx.setPixelColor(i, neoPx.Color(r, g, b));
  }
  neoPx.show();
  delay(5);
}

void rainbow(Adafruit_NeoPixel neoPx, uint8_t ledCount) {
  uint8_t R = 255;
  uint8_t G = 50;
  uint8_t B = 50;
  for (G; G<254; G=G+5) showAllNeopixel(neoPx, ledCount, R, G, B);
  for (R; R>49; R=R-5) showAllNeopixel(neoPx, ledCount, R, G, B);
  for (B; B<254; B=B+5) showAllNeopixel(neoPx, ledCount, R, G, B);
  for (G; G>49; G=G-5) showAllNeopixel(neoPx, ledCount, R, G, B);
  for (R; R<254; R=R+5) showAllNeopixel(neoPx, ledCount, R, G, B);
  for (B; B>49; B=B-5) showAllNeopixel(neoPx, ledCount, R, G, B);
}


void setup() {
  serial_setupConnection(9600);
  dht.begin();
  while (!sgp30.begin()) {
    Serial.println("En attente du capteur SGP30...");
    delay(1000);
  }
  pinMode(A1, INPUT);
  lcdRgb.begin(16, 2);
  pinMode(3, INPUT);
  Neopixel_2.begin();
}

void loop() {
  Serial.print("@Graph:");
  Serial.print("Temperature:");
  Serial.print(dht.readTemperature());
  Serial.print("|");
  Serial.print("Humidity:");
  Serial.print(dht.readHumidity());
  Serial.print("|");
  Serial.print("CO2:");
  Serial.print(sgp30_readCO2());
  Serial.print("|");
  Serial.print("Light:");
  Serial.print(analogRead(A1));
  Serial.print("|");
  Serial.print("\n");
  delay(50);
  lcdRgb.setCursor(0, 0);
  lcdRgb.print(String(dht.readTemperature()));
  lcdRgb.setCursor(0, 1);
  lcdRgb.print(String(dht.readHumidity()));
  if (dht.readTemperature() >= 22.01) {
    lcdRgb.setRGB(255, 0, 0);
  } else if (dht.readHumidity() <= 40.01) {
    lcdRgb.setRGB(255, 0, 0);
  } else if (dht.readTemperature() <= 18.01) {
    lcdRgb.setRGB(255, 0, 0);
  }
  lcdRgb.setRGB(255, 255, 255);
  delay(2000);
  lcdRgb.setCursor(0, 0);
  lcdRgb.print(String(sgp30_readCO2()));
  lcdRgb.setCursor(0, 1);
  lcdRgb.print(String(analogRead(A1)));
  if (sgp30_readCO2() >= 100000.01) {
    lcdRgb.setRGB(255, 0, 0);
  } else if (analogRead(A1) <= 50.01) {
    lcdRgb.setRGB(255, 0, 0);
  }
  if (digitalRead(3) == true) {
    rainbow(Neopixel_2, LED_COUNT_NP2);
  }
  delay(2000);
  lcdRgb.setRGB(255, 255, 255);
}