Measurement

ulrasonic hc-sr04

Hi
The code below dose work but dose not calculate the distance propply
can some kind person tell me what i am doing wrong


program MyPortB
#DEFINE OSC 20
' pic16f877
dim LCD_RS as sbit at RD2_bit
LCD_EN as sbit at RD3_bit
LCD_D4 as sbit at RD4_bit
LCD_D5 as sbit at RD5_bit
LCD_D6 as sbit at RD6_bit
LCD_D7 as sbit at RD7_bit

dim LCD_RS_Direction as sbit at TRISD2_bit
LCD_EN_Direction as sbit at TRISD3_bit
LCD_D4_Direction as sbit at TRISD4_bit
LCD_D5_Direction as sbit at TRISD5_bit
LCD_D6_Direction as sbit at TRISD6_bit
LCD_D7_Direction as sbit at TRISD7_bit

dim Triger as sbit at portb.2
dim ch as string[8]
dim number as word


main:
trisa=0
Trisb =0 ' designate portb as output (LCD is connected to portb)
trisc=0
portb=0
trisd=0
portd=0
trisb.4 =1
trisb.2=0


Lcd_Init() ' initialize (4-bit interface connection)
Lcd_Cmd(_LCD_CURSOR_OFF) ' send command to LCD (cursor off)
Lcd_Cmd(_LCD_CLEAR)
Lcd_Out(1,1,"Number")
number=00

while true '

Ow_Reset(PORTB, 4)
Triger =true '1 ' portb.2 =1
delay_us(50)
Triger =false ' 0 ' portb.2=0
number = Ow_Read(PORTB, 4)
number = number + (Ow_Read(PORTB, 4) << 8)

number = (number /2)/ 29.1

wordToStr(number, ch)
Lcd_Out(2,8,ch)
delay_us(500)
wend
' Main program
end.

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