how to write a mikroc code for ultrasonic sensor hc-sr04

[rania1996]

hi
I want to write a mikroc code for ultrasonic sensor hc-sr04 and I need help
I am using pic16f876a

I am using ultrasonic sensor above my robot ... I want to make my robot go forward when the echo pin got signal and if the distance between my robot and the other one 50 cm or less

couls you plz help me ??

 

[panic mode]

that is 4-pin device. i used 3-pin version and it was very simple as long as one understands timing.
https://www.electro-tech-online.com/custompdfs/2013/01/HCSR04.pdf

using 4-pin version should be simpler as you don't need to change function of a pin between input and output.
here is some code that supposedly does the trick:
https://www.edaboard.com/thread260878-2.html

 

[rania1996]

I am not using timer .. look in arduino
it like this :

#define trigPin 12
#define echoPin 13

void setup() {

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void loop() {
  int duration, distance;
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(1000);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;

  delay(500);
}

I want to write in in microC ... I wrote this code :
TRISB.f1=0;                // trigpin is low
  TRISB.f0=1;               //  echopin high

  TRISB.f1=1;                                // trigpin high
  delay_us(10);                           // wait 10 us
  TRISB.f1=0;                              // trigpin low
     char duration;
     char distance;
   duration=button(PORTB, 0, 1, 1)
   distance = (duration/2) / 29.1;      // elzaman/2 / ( 340m/s)
   if (distance <= 50);
   rotate_f;
  delay_us(100);
}
}

..................

I want to know what I should replace ( int duration ... int duration )

and this sentence ( duration = pulseIn(echoPin, HIGH); )

^^"

 

[lijoppans]

MikroC Code :

// LCD module connections
sbit LCD_RS at RD2_bit;
sbit LCD_EN at RD3_bit;
sbit LCD_D4 at RD4_bit;
sbit LCD_D5 at RD5_bit;
sbit LCD_D6 at RD6_bit;
sbit LCD_D7 at RD7_bit;

sbit LCD_RS_Direction at TRISD2_bit;
sbit LCD_EN_Direction at TRISD3_bit;
sbit LCD_D4_Direction at TRISD4_bit;
sbit LCD_D5_Direction at TRISD5_bit;
sbit LCD_D6_Direction at TRISD6_bit;
sbit LCD_D7_Direction at TRISD7_bit;
// End LCD module connections

int a;

//Interrupt function will be automatically executed on Interrupt
void interrupt()
{
if(INTCON.RBIF == 1) //Makes sure that it is PORTB On-Change Interrupt
{
INTCON.RBIE = 0; //Disable On-Change Interrupt
if(PORTB.F4 == 1) //If ECHO is HIGH
T1CON.F0 = 1; //Start Timer
if(PORTB.F4 == 0) //If ECHO is LOW
{
T1CON.F0 = 0; //Stop Timer
a = (TMR1L | (TMR1H<<8))/58.82; //Calculate Distance
}
}
INTCON.RBIF = 0; //Clear PORTB On-Change Interrupt flag
INTCON.RBIE = 1; //Enable PORTB On-Change Interrupt
}

void main()
{
char txt[7];
Lcd_Init();
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off

TRISB = 0b00010000;
INTCON.GIE = 1; //Global Interrupt Enable
INTCON.RBIF = 0; //Clear PORTB On-Change Interrupt Flag
INTCON.RBIE = 1; //Enable PORTB On-Change Interrupt

Lcd_Out(1,1,"Developed By");
Lcd_Out(2,1,"electroSome");

Delay_ms(3000);
Lcd_Cmd(_LCD_CLEAR);

T1CON = 0x10; //Initializing Timer Module

while(1)
{
TMR1H = 0; //Setting Initial Value of Timer
TMR1L = 0; //Setting Initial Value of Timer

a = 0;

PORTB.F0 = 1; //TRIGGER HIGH
Delay_us(10); //10uS Delay
PORTB.F0 = 0; //TRIGGER LOW

Delay_ms(100); //Waiting for ECHO
a = a + 1; //Error Correction Constant
if(a>2 && a<400) //Check whether the result is valid or not
{
IntToStr(a,txt);
Ltrim(txt);
Lcd_Cmd(_LCD_CLEAR);
Lcd_Out(1,1,"Distance = ");
Lcd_Out(1,12,txt);
Lcd_Out(1,15,"cm");
}
else
{
Lcd_Cmd(_LCD_CLEAR);
Lcd_Out(1,1,"Out of Range");
}
Delay_ms(400);
}
}

Try the following link :
Interfacing HC-SR04 Ultrasonic Sensor with PIC Microcontroller
It contains the detailed explanation of interfacing HC-SR04 ultrasonic sensor with PIC Microcontroller using MikroC Pro and MPLAB XC8 Compilers.

 

[Abhik Chowdhury]

how to write this code for dspic30f4011 mcu. plzzz help

 

[Ian Rogers]

how to write this code for dspic30f4011 mcu. plzzz help

Seriously!!! The code should port over quite well.. All you need to do is change hardware specifics...

 

[Abhik Chowdhury]

no no sir its not working getting stucked with the timer part i.e. TMR1h and TMR1L. PLZZ SUGGEST SOME WAY OUT about this.

 

[Ian Rogers]

Post YOUR code and I'll see where its not working!!

 

[Abhik Chowdhury]

// LCD module connections
sbit LCD_RS at RE0_bit;
sbit LCD_EN at RE1_bit;
sbit LCD_D4 at RE2_bit;
sbit LCD_D5 at RE3_bit;
sbit LCD_D6 at RE4_bit;
sbit LCD_D7 at RE5_bit;

sbit LCD_RS_Direction at TRISE0_bit;
sbit LCD_EN_Direction at TRISE1_bit;
sbit LCD_D4_Direction at TRISE2_bit;
sbit LCD_D5_Direction at TRISE3_bit;
sbit LCD_D6_Direction at TRISE4_bit;
sbit LCD_D7_Direction at TRISE5_bit;
// End LCD module connections

void IntDetection() org 0x0014 //Interrupt on INT0
{
LATD++;
IFS0.F0 = 0; //interrupt flag cleared



TRISD.F0 = 0; //portd is output
TRISE.F8 = 1; //portf is input
IFS0 = 0; //interrupt flag cleared
IEC0 = 1; //Interrupt is set on a rising edge at INT0 (RF6)
while(1) asm nop;
}
int a;
char txt[7];
Lcd_Init();
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
ADPCGF = 0XFFFF; //CONFIG ANALOG PINS ON PORTB TO DIGITAL
TRISB.F4 = 1; //RB4 as Input PIN (ECHO)

Lcd_Out(1,1,"Developed By");
Lcd_Out(2,1,"electroSome");

Delay_ms(3000);
Lcd_Cmd(_LCD_CLEAR);

T1CON = 0x8030; //Initialize Timer Module

while(1)
{
TMR1H = 0; //Sets the Initial Value of Timer
TMR1L = 0; //Sets the Initial Value of Timer

PORTB.F0 = 1; //TRIGGER HIGH
Delay_us(10); //10uS Delay
PORTB.F0 = 0; //TRIGGER LOW

while(!PORTB.F4); //Waiting for Echo
T1CON.F0 = 1; //Timer Starts
while(PORTB.F4); //Waiting for Echo goes LOW
T1CON.F0 = 0; //Timer Stops

a = (TMR1L | (TMR1H<<8)); //Reads Timer Value
a = a/58.82; //Converts Time to Distance
a = a + 1; //Distance Calibration\
if(a>=2 && a<=400) //Check whether the result is valid or not
{
IntToStr(a,txt);
Ltrim(txt);
Lcd_Cmd(_LCD_CLEAR);
Lcd_Out(1,1,"Distance = ");
Lcd_Out(1,12,txt);
Lcd_Out(1,15,"cm");
}
else
{
Lcd_Cmd(_LCD_CLEAR);
Lcd_Out(1,1,"Out of Range");
}
Delay_ms(400);
}
}



the timer part is not wrking in dspic30f4011 its timer 1 module is different from pic16.

 

[Ian Rogers]

For a start... you can't run everything in an interrupt... you need a main function... I'm surprised that mikroC hasn't complained that there is no main()...

Secondly... Pic33 and 24 are 16 bit and there is no TMR1L and H just TMR1..
Thirdly.. Timer 1 interrupt vector is 11 not 14..
Fourthly.. INT0 is on RE8 not RF6..
Lastly.... This chip supports input capture, which will do all this automatically..

So! use the code posted... Change the interrupt to use vector 11 and change variable a to read TMR1

ALSO!! I like mikroC's bit declarations RE8_bit = x; .. and while(!RE8_bit);

Personally! I think you need to get to grips with something a bit simpler... This chip is way over your head..

 

[Abhik Chowdhury]

yes you r correct that dis chip is way over my head bt actualy i am a trainee in a compny so i hav beeen assigned with dis chip. so can u pleas help me by sending me the correct code plzzz. i hav tried in all the way bt failed so plzz can u help me

 

[Ian Rogers]

A) I don't use that chip...
B) I haven't got MikroC for 16 bit chips

I can however use C30 lite, but you will still have the same problem porting to mikroC..

 

[Ian Rogers]

If You are a trainee, then ask your company for tuition...

 

[Abhik Chowdhury]

thank u so much sir for your support. bt here things r nt like dat bt neway i wil fig it out thnx alot