Environmental Sensor Tree

//OLED
#include <Wire.h>
#include <SeeedGrayOLED.h>
#include <avr/pgmspace.h>

//BME temp
#include "DFRobot_BME680_I2C.h"
#include "Wire.h"
DFRobot_BME680_I2C bme(0x76);  

//SHT temp
#include <Arduino.h>
#include "SHT31.h"
SHT31 sht = SHT31();

//pir
#define PIR 2


//led ring
#include "Adafruit_NeoPixel.h"
#ifdef __AVR__
  #include <avr/power.h>
#endif

#define PIN            6
#define NUMPIXELS      20
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);




void setup() {
  Wire.begin();  
  bme.begin();
  sht.begin();
  SeeedGrayOled.init(SH1107G);  //initialize SEEED Gray OLED display
  SeeedGrayOled.clearDisplay();           //clear the screen and set start position to top left corner
  SeeedGrayOled.setNormalDisplay();       //Set display to Normal mode
  SeeedGrayOled.setVerticalMode();        // Set to vertical mode for displaying text
  SeeedGrayOled.setTextXY(0,0);  
  SeeedGrayOled.putString("Hello World");
  pinMode(PIR, INPUT);

  #if defined (__AVR_ATtiny85__)
  if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
#endif

  pixels.setBrightness(255);
  pixels.begin(); // This initializes the NeoPixel library.
}

void loop() {
    delay(1000);
if(digitalRead(PIR)==HIGH){

  for(int i=0;i<NUMPIXELS;i++){
    pixels.setPixelColor(i, pixels.Color(25,150,129)); 
    pixels.show(); 
  }
  
  bme.startConvert();
  bme.update();
//  SeeedGrayOled.clearDisplay();
  SeeedGrayOled.setTextXY(0,0);  
  SeeedGrayOled.putString("Temp: ");
  SeeedGrayOled.putNumber((sht.getTemperature() + bme.readTemperature()/100)*0.5);  //avg of two temp sensors
  SeeedGrayOled.putString(" C   ");
  SeeedGrayOled.setTextXY(2,0);  
  SeeedGrayOled.putString("Hum: ");
  SeeedGrayOled.putNumber((sht.getHumidity() + bme.readHumidity()/1000)*0.5);
  SeeedGrayOled.putString(" %");
  SeeedGrayOled.setTextXY(4,0);
  SeeedGrayOled.putString("Loudness: ");
  SeeedGrayOled.putNumber((float)analogRead(0));
  SeeedGrayOled.putString("  ");
  SeeedGrayOled.setTextXY(6,0);
  SeeedGrayOled.putString("Harmful gas");
  SeeedGrayOled.setTextXY(7,0);
  SeeedGrayOled.putString("density: ");
  SeeedGrayOled.putNumber((float)analogRead(1)/1024*100);
  SeeedGrayOled.putString(" %");
  SeeedGrayOled.setTextXY(9,0);
  SeeedGrayOled.putString("Pres: ");
  SeeedGrayOled.putNumber(bme.readPressure());
  SeeedGrayOled.putString(" Pa");
  SeeedGrayOled.setTextXY(11,0);
  SeeedGrayOled.putString("Altitude: ");
  SeeedGrayOled.putNumber(bme.readAltitude());
  SeeedGrayOled.putString(" m");

  if(((sht.getTemperature() + bme.readTemperature()/100)*0.5)>28){ //When temp>28C, led flash red and oled displays "too hot"
      SeeedGrayOled.setTextXY(14,0);
      SeeedGrayOled.putString("Too hot!");
      for(int i=0;i<NUMPIXELS;i++){
      pixels.setPixelColor(i, pixels.Color(150,0,0)); 
      pixels.show(); 
      delay(100);
    }
  }

}else{    //when there's no people  around

  SeeedGrayOled.clearDisplay();
  SeeedGrayOled.setTextXY(0,0);  
  SeeedGrayOled.putString("Not detected ");
  for(int i=0;i<NUMPIXELS;i++){
    pixels.setPixelColor(i, pixels.Color(0,0,150)); 
    pixels.show(); 
    delay(50);
  }
    for(int i=0;i<NUMPIXELS;i++){
    pixels.setPixelColor(i, pixels.Color(0,0,0)); 
    pixels.show(); 
    delay(50);
 
  }
  

}

}