ismbn
Full Member level 3
- Joined
- Feb 11, 2012
- Messages
- 160
- Helped
- 4
- Reputation
- 8
- Reaction score
- 4
- Trophy points
- 1,308
- Location
- Mumbai. india
- Activity points
- 2,444
Hello.
I am Working in The Project which uses ultrasonic sensor for Height Measurement, The Module of Ultrasonic is shown in Pic Modle HC-SR 04**broken link removed**. for This we have to give the trigger of 10uS at trigger pin, and the The as per the distance the Echo pic give the level pulse. and there is an equation using the the distance i being Measured...
as per some tutorial i have connected it to the PORTB4 that is "Change on Interrupt" pin... The Thing is i am configuring it correctly (I suppose) but the Interrupt is Not Getting Fired.
I am attaching the code Please Look into it and correct me....
Please Give Reply the Deadline is already over... Please help me
Using
MPLAB 8
PIC18F4520
xc8 Compiler
Pickit 3
Thank you...
I am Working in The Project which uses ultrasonic sensor for Height Measurement, The Module of Ultrasonic is shown in Pic Modle HC-SR 04**broken link removed**. for This we have to give the trigger of 10uS at trigger pin, and the The as per the distance the Echo pic give the level pulse. and there is an equation using the the distance i being Measured...
as per some tutorial i have connected it to the PORTB4 that is "Change on Interrupt" pin... The Thing is i am configuring it correctly (I suppose) but the Interrupt is Not Getting Fired.
I am attaching the code Please Look into it and correct me....
Please Give Reply the Deadline is already over... Please help me
Using
MPLAB 8
PIC18F4520
xc8 Compiler
Pickit 3
Code:
#define _XTAL_FREQ 8000000
#include <stdio.h>
#include <string.h>
#include <p18F4520.h>
#include "pic_lcd.h"
#define Trigger PORTCbits.RC0
#define Power PORTBbits.RB0
#define Echo PORTBbits.RB4
// interrupt handling variables
char m10sec;
char timerL, timerH;
// interrupt handling variables
//data types convert
char data_buff[16];
float Height_val;
//data types convert
// Display Related Variables
char disp_ram[2][16];
// Display Related Variables
char sensor_flag = 0;
bit read_flag = 0;
/// Function Prototypes
void Refresh_lcd();
void fill_ram(char y, char x, char str[16]);
void Trigger_Sensor();
/// Function Prototypes
void interrupt Interrupt(void)
{
if ( INTCONbits.TMR0IF == 1 )
{
INTCONbits.TMR0IF = 0;
TMR0H = 0xF8;
TMR0L = 0x20 ;
m10sec ++;
if(m10sec >=10){
Refresh_lcd();
m10sec = 0;
}
INTCONbits.GIE = 1;
}
if(INTCONbits.INT0IF == 1){
Trigger_Sensor();
INTCONbits.INT0IF = 0;
}
if(RBIF == 1)
{
char temp1, temp2;
temp1 = PORTBbits.RB4;
RBIF = 0;
if(Echo == 1){
TMR1ON = 1;
}
if(Echo == 0){
TMR1ON = 0;
timerH = TMR1H;
timerL = TMR1L;
TMR1H = 0;
TMR1H = 0;
read_flag = 1;
}
}
INTCONbits.GIE = 1;
INTCONbits.PEIE = 1;
}
void timer0_init()
{
T0CON = 0x08;
TMR0H = 0xF8;
TMR0L = 0x20;
INTCON = 0x04;
INTCONbits.TMR0IE = 1;
INTCONbits.PEIE = 1;
INTCONbits.GIE = 1;
T0CONbits.TMR0ON = 1;
}
void ftoa(float i)
{
sprintf(data_buff,"Height = %.2f",i);
// return(data_buff);
}
void change_int_init(){
T1CON = 0x10;
TMR1H = 0x00;
TMR1L = 0x00;
T1CONbits.TMR1ON = 0;
INTCONbits.RBIE = 1; //Enable PORTB On-Change Interrupt
}
void Trigger_Sensor(){
Trigger = 1;
__delay_us(10);
Trigger = 0;
}
void Refresh_lcd(){
lcd_goto(1,0);
for(char i = 0; i < 2; i++){
for(char j = 0; j< 16; j++){
lcd_putch(disp_ram[i][j]);
}
lcd_goto(2,0);
}
}
void my_ftoa(float i)
{
int num,dec;
//char b[10];
num=i;
dec=(i-num)*100;
sprintf(data_buff,"Height = %d.%d",num,dec);
}
void find_Height(){
Height_val = (timerL | (timerH <<8 ))/58.82;
timerL = 0;
timerH = 0;
my_ftoa(Height_val);
}
void main()
{
TRISD = 0x00;
TRISB = 0xF0;
TRISC = 0xFF;
PORTC = 0xFF;
//TRISD = 0x00;
PORTD = 0x00;
PORTD = 0x00;
timer0_init();
change_int_init();
lcd_init();
INTCON = 0xF8;
__delay_ms(10);
lcd_goto(1,1);
lcd_putch('A');
fill_ram(0,3,"Indent");
while(1)
{
/*
if(Power == 1 && sensor_flag == 0){
__delay_ms(10);
if(Power == 1){
Trigger_Sensor();
sensor_flag = 1;
}
}
*/
if((sensor_flag == 1) && read_flag == 1){
find_Height();
}
// if(sensor_flag == 1)
}
}
void fill_ram(char y, char x, char str[16]){
char len;
len = strlen(str);
char i =0, j = 0;
for(i =0; i < x && i<16; i++){
disp_ram[y][i] = ' ';
}
for(i = x,j =0; i < len+x && i < 16; i++){
disp_ram[y][i] = str[j++];
}
if(i < 15 )
for(i = len+x; i < 16; i++){
disp_ram[y][i] = ' ';
}
}Thank you...
Last edited:
