/*
-------calculation-----------
speed of sound = 340.29 m/sec.
Here the total distance travelled by sound = sum of
distance from sensor to object and object to sensor.
But both are same . so we need only one distance.
then speed become 170.15 m/sec.
converts m/sec to cm/microseconds.
then (170*100)/1000000 = 0.01715cm/us.
from above equation time taken to
travel distance 1CM= 1/0.01715cm = 58.3us.
---WIRING-----
VCC to 5v
GND to GND
Echo to pin B0
Trig to pin B1
*/
int c1=0;
char distance[8];
void usinit(void);
void uscheck(void);
// 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
void main(){
Lcd_Init(); // Initialize LCD
Lcd_Cmd(_LCD_CLEAR); // Clear display
Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off
usinit();
while(1)
{ Lcd_Cmd(_LCD_CLEAR);
Lcd_Out(2,1,distance);
uscheck();
}
}
void uscheck(void)
{
portb.f1=1 ;
delay_us(10);
portb.f1=0 ;
while(!portb.f0);
c1=0;
while(portb.f0) {c1++; delay_us(58); } // 1CM ==58US
IntToStr(c1, distance);
delay_ms(200);
}
void usinit(void)
{
trisb.f0=1; //echoPin
trisb.f1=0; //trigPin
}