PLACE CAN YOU HELP SCD30 SENSOR

[GAMCH96]

Hello, I have a small problem.

I tried to use SCD 30 Sensor - Carbon dioxide (CO2), humidity, temperature by I2C protocol

It doesn't work anything.

Place can you help me , I try to ask help there, but do not get any answer.
I ask from here to help.

I have two I2C pull up resistors to 3.3V 1.7kohms.

The PIC16f877 works with 3.3 volt by SDC30 Sensor.
I have CCS compiler v5.092


This is the code:

//LCD module connections PUERTO B
#define LCD_RS_PIN PIN_B0
#define LCD_RW_PIN PIN_B1
#define LCD_ENABLE_PIN PIN_B2
#define LCD_DATA4 PIN_B3
#define LCD_DATA5 PIN_B4
#define LCD_DATA6 PIN_B5
#define LCD_DATA7 PIN_B6
//End LCD module connections


#include <16F877A.h>
#device ADC=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O

#use delay(crystal=4000000)
#use i2c(MASTER, sda=pin_C4, scl=pin_C3)
# include <lcd.c>
# include <stdint.h>

char concentracionco2,temperatura;
byte dataco2,datatemp,datahum;

void main()
{
set_tris_d(0);

while(TRUE)
{
set_tris_c(0b11111111);
lcd_init();
delay_ms(2000);
printf(lcd_putc,"hola" );
delay_ms(500); // Le damos un retardo de 500 ms
lcd_putc("\f");
printf(lcd_putc,"hola222222" );
delay_ms(500); // Le damos un retardo de 500 ms
lcd_putc("\f");
delay_ms(500);
output_high(pin_a0);
delay_ms(100);
delay_ms(200);
output_low(pin_a0);
delay_ms(200);
i2c_start();
delay_ms(200);
i2c_write(0xC2);
delay_ms(200);
i2c_write(0x00);
delay_ms(200);
i2c_write(0x10);
delay_ms(200);
i2c_stop();
delay_ms(2000);
i2c_start();
delay_ms(200);
i2c_write(0xC3); // le decimos que vamos a leer
delay_ms(200);
// Nivel de CO2
dataco2 = i2c_read() << 24 ;
delay_ms(200);
dataco2 += i2c_read() << 16;
delay_ms(200);
i2c_read(); // El CRC
delay_ms(200);
dataco2 += i2c_read() << 8 ;
delay_ms(200);
dataco2 += i2c_read();
delay_ms(200);
i2c_read(); // El CRC
delay_ms(200);
printf(lcd_putc,"hola 2 para co2" );
delay_ms(200);
delay_ms(500); // Le damos un retardo de 500 ms
delay_ms(200);
lcd_putc("\f");
delay_ms(200);
delay_ms(500);
// Temperatura
datatemp = i2c_read() << 24 ;
datatemp += i2c_read() << 16;
i2c_read(); // El CRC
datatemp += i2c_read() << 8 ;
datatemp += i2c_read();
i2c_read(); // El CRC
printf(lcd_putc,"hola3" );
delay_ms(500); // Le damos un retardo de 500 ms
lcd_putc("\f");
delay_ms(500);
// Humedad
datahum = i2c_read() << 24 ;
datahum += i2c_read() << 16;
i2c_read(); // El CRC
datahum += i2c_read() << 8 ;
datahum += i2c_read();
i2c_read(); // El CRC
i2c_stop();
printf(lcd_putc,"hola444" );
delay_ms(500); // Le damos un retardo de 500 ms
lcd_putc("\f");
delay_ms(500);

delay_ms(100);
lcd_gotoxy(1,1);
printf(lcd_putc,"%d",concentracionco2); // aqui en el lcd imprime un cero
delay_ms(2000);
lcd_gotoxy (1,2); //
printf(lcd_putc,"%u,%u,%u", datahum,temperatura,dataco2 ); // aqui en el lcd me imprime 221 , 0, 221
delay_ms(500); //
lcd_putc("\f");
delay_ms(500);

}

}

[Ttelmah]

Key thing. Read the sticky at the top of the forum about 5v and 3.3 v
interfacing.
The SCD30, can run at 5v, but it's I2C interface is a 3v interface. Will
not work with your chip without level translation.
From the SCD30 datasheet: