File content as of revision 0:c64c42c6b39b:

#include "mbed.h"
#include "C12832.h"
#include "Sht31.h"

C12832 lcd(SPI_MOSI, SPI_SCK, SPI_MISO, p8, p11);

PwmOut speaker(p21);
AnalogIn pot(p15);
DigitalOut L1(p5);
DigitalIn bt(p20);
Sht31 sht31(I2C_SDA, I2C_SCL);

void play_tone(float frequency, float volume, float interval, float rest) {
    speaker.period(1.0 / frequency);
    speaker = volume;
    wait(interval);
    speaker = 0.0;
    wait(rest);
}

int main() {
  printf("Práctica 7, equipo 3\n");
 
 int i, s;
 float x;
      x = pot.read();
  s = 5;

 lcd.cls();
   for(int x = 0; x < 0.4; ){
     
     lcd.locate(1,1);
     lcd.printf("Precalentando");
     lcd.copy_to_lcd();
     wait(0.5);
     lcd.cls();
     
     wait(1);
     lcd.locate(1,1);
     lcd.printf("Precalentando");
     lcd.copy_to_lcd();
     wait(0.5);
     lcd.cls();
     
     wait(1);
     lcd.locate(1,1);
     lcd.printf("Precalentando");
     lcd.copy_to_lcd();
     wait(0.5);
     lcd.cls();
     
     wait(1);
     lcd.locate(1,1);
     lcd.printf("Precalentando");
     lcd.copy_to_lcd();
     wait(0.5);
     lcd.cls();
     
     wait(1);
     lcd.cls();
     lcd.locate(1,1);
     lcd.printf("Precalentando");
     lcd.copy_to_lcd();
     }
  
  
 while(1){
     
     if(bt == 1){
     
     x = pot.read();
     lcd.cls();
     
 for(x = .25; x < .35 ;  ){
     lcd.cls();
     lcd.printf("Niveles de C02 normales");
     lcd.copy_to_lcd();
     play_tone(450.0, 0.5, 1, 1.5);}
 for(x = .350; x < 1; ){
          lcd.cls();
     lcd.printf("Congestionado, pero con buen intercambio de aire.");
     lcd.copy_to_lcd();
     play_tone(460.0, 0.5, 1, 1);}
     
 for(x = 1; x < 2; ){
          lcd.cls();
     lcd.printf("Calidad de aire baja");
     lcd.copy_to_lcd();
     play_tone(470.0, 0.5, 1, 0.7);}
     
 for(x = 2; x < 5; ){
          lcd.cls();
     lcd.printf("Peligro");
     lcd.copy_to_lcd();
     play_tone(480.0, 0.5, 0.7, 0.5);}
     
 if(x == 5){
    L1 = 1;
          lcd.cls();
     lcd.printf("¡Aléjate!");
     lcd.copy_to_lcd();
     play_tone(500.0, 0.5, 0.5, 0.1);}
     
 if(x == 0){
     lcd.cls();
     lcd.printf("Error");
     lcd.copy_to_lcd();}
            
                        }
    else{
           printf("Si el led enciende, significa peligro");
           lcd.cls();

        float temp = sht31.readTemperature();
        float humidity = sht31.readHumidity();

        lcd.locate(3, 3);
        lcd.printf("Temperature: %.2f C", temp);
        lcd.locate(3, 13);
        lcd.printf("Humidity: %.2f %%", humidity);

        L1 = temp > 40.0f;

        wait(0.5f);
        }

        }
}