imu sensor mpu 6050 help

[disha k]

i have interfaced a mpu 6050 to my atmega 8 & have written a code using i2c header file.
the code is to see whether the device is accessible or not. and the function used is:
 unsigned char i2c_start(unsigned char address)  //  Issues a start condition and sends address and transfer direction.
                                                                                //return 0 = device accessible, 1= failed to access device
                                                                               //then i am printing the value got on lcd
ex:
#define Dev24C02 0X68   //sensor address
ret=i2c_start(Dev24C02);    //sending device address
  lcd_showvalue(ret);

 
so ret should either print 0 or 1.
but lcd remains blank (there is no  print at all).
i have tested the lcd (it’s working all fine with other programs).
I am unable to figure out what is the exact problem..

[AJISH ALFRED]

Check the lcd writting function written in this code by printing some alphabets.

[disha k]

i have done that thing also  nothing is wrong with the lcd …

this is my actual code:

here is my code:

#include<avr/io.h>                 //This is the header for AVR Microcontroller.
#define F_CPU 12000000UL
#include “i2cmaster.h”
#include<util/delay.h>      
#include”lcd118010.h”                  //lcd
#define mpu 0X68                     //address of the i2c device
int main(void)
{
unsigned char ret=0;

DDRC=0X00;
PORTC=0X00;                           //disabling the internal pull up for sda,scl
lcd_init();
i2c_init();                                   //initialise i2c communication

while(1)
{
lcd_string(“hi “);
_delay_ms(1000);

ret=i2c_rep_start(mpu);      //send adress to recognize slave device  and if  ret=0 device is  accesible  ret=1 device is not accessible

lcd_showvalue(ret);  //print that value on lcd
_delay_ms(1900);

lcd_clear();    //clear lcd & continue
}
}
[/CODE]

my observations :lcd is printing “hi” but,  ret   value is not printing(neither 1 nor 0) and neither is lcd clearing.

 

“””but if i am commenting  ret=i2c_rep_start(mpu); “”””

 

then only lcd clears &  rexecutes the loop

how do i solve this problem?  is my sensor ok!!

[CODE]
#include<avr/io.h>                 //This is the header for AVR Microcontroller.
#define F_CPU 12000000UL
#include “i2cmaster.h”
#include<util/delay.h>      
#include”lcd118010.h”                  //lcd
#define mpu 0X68                     //address of the i2c device
int main(void)
{
unsigned char ret=0;

DDRC=0X00;
PORTC=0X00;                           //disabling the internal pull up for sda,scl
lcd_init();
i2c_init();                                   //initialise i2c communication

while(1)
{
lcd_string(“hi “);
_delay_ms(1000);

ret=i2c_rep_start(mpu);      //send adress to recognize slave device  and if  ret=0 device is  accesible  ret=1 device is not accessible

lcd_showvalue(ret);  //print that value on lcd
_delay_ms(1900);

lcd_clear();    //clear lcd & continue
}
}
[/CODE]

my observations :lcd is printing “hi” but,  ret   value is not printing(neither 1 nor 0) and neither is lcd clearing.

 

“””but if i am commenting  ret=i2c_rep_start(mpu); “”””

 

then only lcd clears &  rexecutes the loop

how do i solve this problem?  is my sensor ok!!

[AJISH ALFRED]

Change this statement in your code

 lcd_showvalue(ret);

as given below;

lcd_showvalue(ret + ‘0’);

Because the value in ret is 1, it should be converted to the ascii value of ‘1’ before printing it in the lcd.

 

 

 

[disha k]

ok i will do that

but if you see in the pleury library  that is what i am using  i will post their function here:

*************************************************************************    
  Issues a start condition and sends address and transfer direction.
  return 0 = device accessible, 1= failed to access device
*************************************************************************/
unsigned char i2c_start(unsigned char address)

{

 

////

////code

}/******************************************//////////////////////////////

 

as you can see i have written:

ret=i2c_start(mpu);    //  then ret should return 1 or 0 (unsigned char value)

 

 

And the  lcd function i am using   :

in header file it is given like this:

void lcd_showvalue(unsigned char num)

{

//code

}

that means  “”num””  here is ret  must be a unsigned char value.  So  there is no mistake in the code what i have written earlier right?

but, i will try what you have said & let u know soon the results.

 

 

 

[disha k]

i made the changes what you suggested ..

but, lcd is just blank…

[AJISH ALFRED]

Hi Dishak,

So the problem could be either the function “char i2c_start()  ” is not returning any value properly or there could be some problem inside the function “lcd_showvalue()“. Please post the code of those two functions.

[Author]

Posts