Distance measurement using InfraRed sensor

[Sanket Kulkarni]

 

Hello, I'm performing one of the project mentioned above. I was working on the concept of the program and could'nt get along with this part of the program. If test_final was initialised already to 0 then why the conditional statement was made?

Thank you in advance



s=test_final/100;

test_final=test_final%100;

lcd_cmd(0x8a);

if(s!=0)

lcd_data(s+48);

else

lcd_cmd(0x06);

s=test_final/10;

test_final=test_final%10;

lcd_data(s+48);

lcd_data(test_final+48);

 

[AJISH ALFRED]

Please mention the trouble that you are facing with the project.

[V.Thenmozhi]

Dear sir

can you kindly give me the remote controlled ground vehicle circuit.

[AJISH ALFRED]

Hi Thenmozhi,

Find the link article in this website at.

/contribution/unmanned-ground-vehicle-ugv-or-spycar

The circuit of the same project might be helpful for you.

[Sanket Kulkarni]

I understood the program and implemented it.. still I’m not getting any output on lcd, its just glowing.

I heard about pull-up resistor is required to connect to port0 of micro-controller? What is it and how to connect?

[AJISH ALFRED]

Hi,

A pull-up or pull-down resistor is basically used to preset a value (logic high or logic low) at any pin.

Find the discussion about pull-up and pull-down concept in this forum itself.

 

A pull-up is done by connecting a pin to VCC through a resistor (normally 1K) and a pull down is done by connnecting a pin to ground through a resistor (normally 1K). Pull-up make the preset voltage at the pin as logic high and pull-down make the preset voltage at the pin as logic low. We can change those voltages by writing a low or high respectievely.

[Kausu T R]

 

 

Hello sir, I’m performing one of the project  Distance measurement Distance measurement using InfraRed sensor. I was working on the concept of the program and could’nt get along with this part of the program.i am so confused this convert function.Because this HEX to ASCII conversion couldn’t understan me.Pls explain ths logic as early as possible….

Thank you in advance…

 

void convert()

{

  int s;

  lcd_cmd(0x81); 

  delay(2);

  lcd_data_string(“output:”);

  s=test_final/100;

  test_final=test_final%100;

  lcd_cmd(0x8a);

  if(s!=0)

  lcd_data(s+48);

  else

  lcd_cmd(0x06);

  s=test_final/10;

  test_final=test_final%10;

  lcd_data(s+48);

  lcd_data(test_final+48);

  lcd_data(‘ ‘);

  if(shift>16)

   {

      lcd_cmd(0xc0+(shift-1));

      lcd_data_string(” “);

      shift=0;

   }

  lcd_cmd(0xc0+(shift-1));

  lcd_data(‘ ‘);

  lcd_cmd(0xc0+shift);

  lcd_data_string(“CALIBRATE IT”);

  delay(30);

}

 

[AJISH ALFRED]

 

Hi Kausu,

It is very difficult to comment on the working of this piece of code only since we don’t have the details of your project and the complete code.

What I understood is that, the “convert()” function does the following operations.

-displays a string “output:”

-it extracts the digits from the digit integer “test_final”

-store the digit into two seperate integrs

-convert the integrs into characters, so that they can be displayed on the lcd

-checks whether the number of characters exeeds the number which can be displayed on the first line

-if exeeds go to the next line

-and print “CALIBERATE IT”

 

Printing an integer on LCD:

 

You assume a  value to test_final variable, say 567.

 

  s=test_final/100;                      //now s = 5

  lcd_data(s+48);                        // 48 is the ascii value of ‘0’ and 48+5 gives ascii value of ‘5’

                                                    //and hence print ‘5’ on LCD

 

similary it does for 6 and 7.

 

Have I made it more complex for you?? Take sample value and analyse yourself.

[Author]

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