MIKRO C code is not working ?

[synchrone]

Hello
i have a mikrocontroller pic 16f628a and a ultrasonic sonsor HC-SR04
I'm working with the intern pulse 4MHz
pleas tell me why this code not working

//Crystal 4MHz
//speed of sound 340m/s
//1 TMR0 cycle = (340/1000000)*256*0.5*100 = 4.352 in cm
#define TRIG PORTA.F0
#define ECHO PORTA.F1

double distance;
void main() {

TRISa.F0 = 1;
TRISa.F1 = 0;
TRISb=0;

OPTION_REG.T0CS = 0;
OPTION_REG.PSA = 0;
OPTION_REG.PS0 = 1;
OPTION_REG.PS1 = 1;
OPTION_REG.PS2 = 1;

  while(1){

  TRIG = 0;
  delay_us(10);
  TRIG = 1;
  delay_us(10);
  TRIG = 0;

  while(ECHO==0);
  TMR0=0;
  while(ECHO==1);
  distance = (double)TMR0 * 4.352;
  Delay_ms(100);
  }
  if(distance < 6) portb=1; // if distance < 6 cm
  else portb=0;

}

 

[jayanth.devarayanadurga]

I don't know whether your code works but the mistake is this...

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Code C - [expand]
1
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TRISa.F0 = 1;
TRISa.F1 = 0;

---

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Code C - [expand]
1
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TRISa.F0 = 0;
TRISa.F1 = 1;

---

 

[synchrone]

what is the difference i put the trig in ra0 and the echo in ra1
please help me

 

[jayanth.devarayanadurga]

TRIG is an output pin and ECHO is an input pin. You have configured them in reverse. May be you also need to disable Comparators on PORTA.

 

[synchrone]

i'm sorry my friend i tried but it still don't working

 

[nagkiller]

I see that the if / else is out of the loop too!!!

Sorry, I dont have the modules for test the code!!!

 

[synchrone]

thank you all
i changed the program to this
but still don't work

//Crystal 4MHz
//speed of sound 340m/s
//1 TMR0 cycle = (340/1000000)*256*0.5*100 = 4.352 in cm
#define TRIG PORTA.F0
#define ECHO PORTA.F1

double distance;
void main() {
CMCON = 0x07;

TRISa.F0 = 0;
TRISa.F1 = 1;
TRISb=0x00;

OPTION_REG.T0CS = 0;
OPTION_REG.PSA = 0;
OPTION_REG.PS0 = 1;
OPTION_REG.PS1 = 1;
OPTION_REG.PS2 = 1;

  while(distance<100){
      portb=0xff;
TRIG= 0;
  delay_us(10);
  TRIG = 1;
  delay_us(10);

 TRIG= 0;

  while(ECHO==0);
  TMR0=0;
  while(ECHO==1);
  distance = (double)TMR0 * 4.352;


  }

    portb=0x00     ;
}

 

[jayanth.devarayanadurga]

http://www.mikroe.com/forum/viewtopic.php?f=88&t=55029

http://www.libstock.com/projects/view/607/code-for-measuring-distance-with-hc-sr04-ultrasonic-sensor

https://www.edaboard.com/threads/260878/

 

[nagkiller]

Code still wrong!!! Is out of loop (while(1){})!!!

Now run once and sleep!!!

 

[jayanth.devarayanadurga]

For testing purpose display the result on LCD. You will know what value it is displaying or whether it is working or not.

 

[synchrone]

Hi every one
I try every program but it's not working please if there is any one tray successfully to program this ultrasonic sensor please help me
I'm going crazy

 

[jayanth.devarayanadurga]

Zip and post your mikroC project files. Post datasheet of your Sensor.

http://www.best-microcontroller-projects.com/pic-sonar.html
http://www.libstock.com/projects/view/607/code-for-measuring-distance-with-hc-sr04-ultrasonic-sensor

 

[123jack]

I'd suggest you single step your code in the mikroe IDE
Take a look around "while(ECHO==1);" etc to start with
and ask what happens if you dont ever get an echo.

A flow chart may help you but I doubt this will do what you want anyway.
Have a read of the stuff jayanth has suggested especially the parts about interrupts.

 

[synchrone]

forget about my program i just need when an object detected of 4 cm or less the portb=1