// Zadej referenční napětí desky Arduino ve voltech:
float Ur=5.01;                                
// Zadej zatěžovací odpor senzoru v ohmech:
int RL=1000;                                  
// Zadej odpor senzoru Ro v ohmech: 
int R0=15620;                                  

//****************************************************************

#include <Wire.h>                                                 
#include <LiquidCrystal_I2C.h>                                  
LiquidCrystal_I2C lcd(0x3F, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);    
int H=0;                                                          
float Um=0;                                                       
float R1;                                                         
float R;                                                          
int C;                                                            
int B=0;                                                          
int S1=0;                                                         
int SB=0;                                                         

void setup()   
{
lcd.begin(16,2);                                               
pinMode(13, OUTPUT);                                            
lcd.setCursor(5,0);                                           
lcd.print("ARDUINO ");                                           
lcd.setCursor(1,2);                                            
lcd.print("Analyzator  CO");                                                
delay(15000);                                                   
lcd.clear();
lcd.setCursor(6,0);                                           
lcd.print("CEKEJ");                                           
lcd.setCursor(1,2);                                            
lcd.print("senzor heating ");                                                
delay(45000);                                                  
lcd.clear();                            
}                                              

void loop()                                                     
{
H=analogRead(14);                            
Um=(Ur*H)/1023;                              
R1=((5-Um)/Um)*RL;                           
R=(R1/R0);                                   
C=(pow(R,-1.409))*106.13;                    
B=analogRead(16);                            
S1=(1023-B)/1.9;                             
SB=100-S1;                                   
lcd.setCursor(0,0);                                           
lcd.print("Konc.CO:");                                           
lcd.setCursor(8,0);
if (Um>4.1)                                  
{C=30000;}                           
if (Um<0.531)                                
{C=0;}  
lcd.print(C);                                
lcd.setCursor(13,0);
lcd.print("ppm");                        
lcd.setCursor(0,2);
lcd.print("Us=");                           
lcd.print(Um);                              
lcd.setCursor(7,2);
lcd.print("V");
lcd.setCursor(9,2);
lcd.print("Bat");
lcd.setCursor(12,2);
if (SB<5)                                 
{SB=0;}                                     
lcd.print(SB);                             
lcd.setCursor(15,2);
lcd.print("%");                   
delay (2000);                              
lcd.clear();                               
}