how to display tangent value in lcd using mikro c and pic18f442

[madhushan90]

Hi, I'm new to microcontroller programming and i want to display a tangent value of an angle in a lcd. I tried by using tan function in mikro c, code was compiled but didn't work in proteus. can any one help me to find out any method to do this. thanks

 

[zia]

madhushan its no problem
just see help by searching floattostr in seach manu if problem then i will send u code

 

[madhushan90]

zia, this is the code I used, but when it simulate in proteus it gives this error massage "Write 0x00 (0) to unimplemented memory address 0x0B5C does nothing" repeatedly.what i should do for solve this

// LCD module connections
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;

sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
// End LCD module connections
char txt[];
float x;
void main(){
Lcd_Init();
Lcd_Cmd(_LCD_CLEAR);
Lcd_Cmd(_LCD_CURSOR_OFF);
x = tan(45);
FloatToStr(x,txt);
Lcd_Out(1,1,txt);
}

 

[xpress_embedo]

Change char txt[];

to

char txt[16];



Download this it's working perfectly..

View attachment LCD.zip

 

[papunblg]

Another solution:-
If you do not want to include the math library use the following table and simple if- else statement or switch statement.


degrees radians tan(x)
-90º -π/2 not defined
-60º -π/3 -1.732050808
-45º -π/4 -1.000000000
-30º -π/6 -0.577350269
0º 0 0
30º π/6 0.577350269
45º π/4 1.000000000
60º π/3 1.732050808
90º π/2 not defined

 

[madhushan90]

Change char txt[];

to

char txt[16];



Download this it's working perfectly..

View attachment 77829

View attachment 77830

hey dude thanks, but i did the same thing but it didn't work i think my software has some compiling error or something. Another thing we know that tangent of 45 degrees is 1 but this shows 1.619758 can you tell me why is that

 

[internetuser2k12]

tan(45) in radians = 1.6197751905438615499827965173949

tan(45) in degrees = 1


------------update---------------

Check this

// LCD module connections
sbit LCD_RS at RB4_bit;
sbit LCD_EN at RB5_bit;
sbit LCD_D4 at RB0_bit;
sbit LCD_D5 at RB1_bit;
sbit LCD_D6 at RB2_bit;
sbit LCD_D7 at RB3_bit;

sbit LCD_RS_Direction at TRISB4_bit;
sbit LCD_EN_Direction at TRISB5_bit;
sbit LCD_D4_Direction at TRISB0_bit;
sbit LCD_D5_Direction at TRISB1_bit;
sbit LCD_D6_Direction at TRISB2_bit;
sbit LCD_D7_Direction at TRISB3_bit;
// End LCD module connections

char txt[23];
double x;

void main(){
       Lcd_Init();
       Lcd_Cmd(_LCD_CLEAR);
       Lcd_Cmd(_LCD_CURSOR_OFF);
       x = tan(45 * 3.1416 / 180);
       FloatToStr(x,txt);
       LCd_Out(1,1,"tan(45) = ");
       Lcd_Out(1,12,txt);
}

tan(radian_value) or tan( degree_value * pi / 180)... pi = 3.1416

Regards

Jayanth D