Interfacing AT89S51 with ultrasonic sensor and LCD

[ggc]

send the circuit diagram i will send u the complete code to u  my mail id is [email protected]

 

[aniket r kambli]

           pls help me with 80c51 ultrasonic distance finder using  hc-sr04 module and led display   assembly code

[Robert Wilson]

pls i neen help.Vending machines are more common these days and these can be seen all around. The vending machines dispense the drink of your choice based on the item you select. You might have come across these machines dispensing either hot drinks or cool drinks.

            In this task you are expected to design a vending machine that can dispense both hot and cool drinks of you choice. The requirements are as follows,

• Turn “ON” the machine
• Select hot or cool drink
• Select options in the hot drink
• Select options in the cool drink
• Select the drink of your choice
• Display the availability/unavailability of the drink
• Select options in case of unavailability
• Option to select another drink (go to main menu)
• Display the cost of that drink
• Count the cash credited and display the amount
• Beep when the amount is paid fully
• Vending machine dispense the selected item
• pls i need idea to write the codes. in keli uvision and interfacing with lcd
•  

[ANITHA]

#include<reg52.h>

 

#define First_Line 0x80

#define Second_Line 0xc0

#define Curser_On  0x0f

#define Curser_Off 0x0c

#define Clear_Display 0x01

#define Data_Port P0

 

sbit Lcd_rs = P2^7;

sbit Lcd_rw = P2^6;

sbit Lcd_en = P2^5;

 

sbit RX= P3^2; 

sbit TX= P3^5;

 

void Distance_Measure();

void Lcd8_Init();

void Lcd8_Command(unsigned char);

void Lcd8_Write(unsigned char,unsigned char);

void Lcd8_Display(unsigned char,const unsigned char*,unsigned int);

void Lcd8_Decimal2(unsigned char,unsigned char);

void Lcd8_Decimal3(unsigned char,unsigned char);

void Lcd8_Decimal4(unsigned char,unsigned int);

void Delay(unsigned int);

void del();  

 

unsigned char i,inch1,inch2,result,obj_distance,rept,sec,j,a=0,c=0,kc,cu=0xc0,l,e[20],num[20],n,v[20];

unsigned long int count=0,count1=0;

 

void main()

{

 

EA=1;

ET0=1;

TMOD=0x01;

TH0=TL0=0x00;

TR0=1;

relay2=0;

Lcd8_Init();Delay(65000); 

    Lcd8_Display(0x80,”Ultrasonic      “,16);

Lcd8_Display(0xc0,”                “,16);

Delay(65000);Delay(65000);

Lcd8_Display(0xC0,”Distance:       “,16);

 

while(1)

{

 

Distance_Measure();

 

}

}

 

 

void Distance_Measure()

{

count=count1=0;

TH0=0x00;TL0=0x00; 

TR0=0;

for(i=0;i<10;i++)         

{

TX=0;           

Delay(1000);

TX=1;           

Delay(10);

TX=0;   

while(RX==0);

TR0=1; 

while(RX==1);

TR0=0;

count=TH0<<8;      

count=count|TL0;    

TH0=TL0=0x00; 

count1=count1+count;

Delay(5000);        

}

count=count1/10;

inch1=count%10000/1000;

inch2=count%1000/100;

result=(inch1*10)+inch2;

 

obj_distance=result-2; 

Lcd8_Decimal3(0XCb,obj_distance); 

 

}

 

void Lcd8_Init()

{

Lcd8_Command(0x38); //to select function set

Lcd8_Command(0x06); //entry mode set

Lcd8_Command(0x0c); //display on

Lcd8_Command(0x01); //clear display

}

 

void Lcd8_Command(unsigned char com)

{

Data_Port=com;

Lcd_en=1;

Lcd_rs=Lcd_rw=0;

Delay(125);

Lcd_en=0;

Delay(125);

}

 

void Lcd8_Write(unsigned char com,unsigned char lr)

{

Lcd8_Command(com);

 

Data_Port=lr; // Data 

Lcd_en=Lcd_rs=1;

Lcd_rw=0;

Delay(125);

Lcd_en=0;

Delay(125);

}

 

void Lcd8_Display(unsigned char com,const unsigned char *word,unsigned int n)

{

unsigned char Lcd_i;

 

for(Lcd_i=0;Lcd_i<n;Lcd_i++)

{ 

Lcd8_Write(com+Lcd_i,word[Lcd_i]);

  }

}

 

void Lcd8_Decimal2(unsigned char com,unsigned char val)

{

unsigned int Lcd_hr,Lcd_t,Lcd_o;

 

Lcd_hr=val%100;

Lcd_t=Lcd_hr/10;

Lcd_o=Lcd_hr%10;

 

Lcd8_Write(com,Lcd_t+0x30);

Lcd8_Write(com+1,Lcd_o+0x30);

}

 

 

void Lcd8_Decimal3(unsigned char com,unsigned char val)

{

unsigned int Lcd_h,Lcd_hr,Lcd_t,Lcd_o;

 

Lcd_h=val/100;

Lcd_hr=val%100;

Lcd_t=Lcd_hr/10;

Lcd_o=Lcd_hr%10;

 

Lcd8_Write(com,Lcd_h+0x30);

Lcd8_Write(com+1,Lcd_t+0x30);

Lcd8_Write(com+2,Lcd_o+0x30);

}

 

 

 

void Delay(unsigned int del)

{

while(del–);

}

 

i am not getting output for this code.here u r using timer 1 pin is tx=P3^5; but tx pin will always high then u r using rx=P3^2;

it is low after detecting the object it will be high.ET0=1;u r not using the timer 1 pin then how the interrupt will enable…………….

              while i am debugging this program i got access violation error at lcd int();….can you please explain for me sir i cannot understand sir.

pls sir

 

[ANITHA]

i need c code for measuring the distance by using ultrasonic sensor……………can u pls send me 

[ANITHA]

y u r enabling the interrupt

 

[MOHIT SARAF]

how can i generate o/p using buzzzer instead of led where buzzer frequency depends on the range usin c code

[sai]

why we will use sbit is that mandatory?

[boominathan]

sir

   i need ultrasonic sensor and 8051 using object identifier. anyone help me

[Mayank]

Please!upload the circuit diagram of above project

 

[nishant]

very nice..

 

[NIDHI SHARMA]

Sir i need a C code for the interfacing of ultrasonic sensor with AT89s51.Pls reply

[nitesh sinha]

i am doing distance measurement using at89c51 and ultrasonic sensor but i m not getting anything on the seven-segment display ,i am using three seven-segment display ,the code is given below

ORG 00H

MOV DPTR,#SSDisplay // moves the address of LUT to DPTR

MOV P1,#00000000B // sets P1 as output port

MOV P0,#00000000B // sets P0 as output port

CLR P3.0 // sets P3.0 as output for sending trigger

SETB P3.1 // sets P3.1 as input for receiving echo

MOV TMOD,#00100000B // sets timer1 as mode 2 auto reload timer

MAIN: MOV TL1,#210D // loads the initial value to start counting from

      MOV TH1,#210D // loads the reload value

      MOV A,#00000000B // clears accumulator

      SETB P3.0 // starts the trigger pulse

      ACALL DELAY1 // gives 10uS width for the trigger pulse

      CLR P3.0 // ends the trigger pulse

HERE: JNB P3.1,HERE // loops here until echo is received

BACK: SETB TR1 // starts the timer1

HERE1: JNB TF1,HERE1 // loops here until timer overflows (ie;48 count)

      CLR TR1 // stops the timer

      CLR TF1 // clears timer flag 1

      INC A // increments A for every timer1 overflow

      JB P3.1,BACK // jumps to BACK if echo is still available

      MOV R4,A // saves the value of A to R4

      ACALL DLOOP // calls the display loop

      SJMP MAIN // jumps to MAIN loop

 

DELAY1: MOV R6,#2D // 10uS delay

LOOP1: DJNZ R6,LOOP1

RET     

 

DLOOP: MOV R5,#50D // loads R5 with 100D

BACK1: MOV A,R4 // loads the value in R4 to A

       MOV B,#100D // loads B with 100D

       DIV AB   // isolates the first digit

       SETB P1.0 // activates LED display unit D1

       ACALL DISPLAY // calls DISPLAY subroutine

       MOV P0,A // moves digit drive pattern for 1st digit to P0

       ACALL DELAY   // 1mS delay

       ACALL DELAY

       MOV A,B // moves the remainder of 1st division to A

       MOV B,#10D // loads B with 10D

       DIV AB   // isolates the second digit

       CLR P1.0 // deactivates LED display unit D1

       SETB P1.1 // activates LED display unit D2

       ACALL DISPLAY

       MOV P0,A // moves digit drive pattern for 2nd digit to P0

       ACALL DELAY

       ACALL DELAY

       MOV A,B // moves the remainder of 2nd division to A

       CLR P1.1 // deactivates LED display unit D2

       SETB P1.2 // activates LED display unit D3

       ACALL DISPLAY

       MOV P0,A // moves the digit drive pattern for 3rd digit to P0

       ACALL DELAY

       ACALL DELAY

       CLR P1.2 // deactivates LED display unit D3

       DJNZ R5,BACK1 // repeats the display loop 100 times

       RET

 

DELAY: MOV R7,#250D   // 1mS delay

LABEL2: DJNZ R7,LABEL2

        RET

 

DISPLAY: MOVC A,@A+DPTR // gets the digit drive pattern for the content in A

         RET

 

SSDisplay: DB 0C0H // Hex code to display DISPLAY 0

DB 0F9H // DISPLAY 1

DB 0A2H // DISPLAY 2

DB 0B0H // DISPLAY 3

DB 99H // DISPLAY 4

DB 94H // DISPLAY 5

DB 84H // DISPLAY 6

DB 0F8H // DISPLAY 7

DB 80H // DISPLAY 8

DB 90H // DISPLAY 9

 

END

 

 

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[Electronics king]

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