New Vision Embedded System Technology group: August 2013

Tuesday, 20 August 2013

Motor race serial communication with PC

And

Sunday, 4 August 2013

Keypad and Serial Communication with PC using 8051

#include <reg51.h>

#define COL P2
#define ROW P0

void MSDelay(unsigned int vaulue);
void SerTx(unsigned char);
// void lcddata(unsigned char value);

unsigned char keypad[4][4]= {'0','1','2','3',
'4','5','6','7',
'8','9','A','B',
'C','D','E','F'};
void main()
{
unsigned char colloc, rowloc;
TMOD=0X20;
TH1=-3;
SCON=0X50;
TR1=1;
COL=0xFF;
while(1)
{
do
{
ROW=0x00;
colloc =COL;
colloc &=0x0F;
}
while(colloc!=0x0F);
do
{
do
{
MSDelay(20);
colloc=COL;
colloc&=0x0F;
}
while(colloc==0x0F);
MSDelay(20);
colloc=COL;
colloc&=0x0F;
}
while(colloc==0x0F);
while(1)
{
ROW=0xFE;
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=0;
break;
}

ROW=0xFD;
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=1;
break;
}

ROW=0xFB;
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=2;
break;
}

ROW=0xF7;
colloc=COL;
colloc&=0x0F;
rowloc=3;
break;
}

if (colloc==0x0E)
SerTx(keypad[rowloc][0]);
else if(colloc==0x0D)
SerTx(keypad[rowloc][1]);
else if(colloc==0x0B)
SerTx(keypad[rowloc][2]);
else
SerTx(keypad[rowloc][3]);
}
}

void SerTx(unsigned char x)
{
SBUF=x;
while(TI==0);
TI=0;
}

void MSDelay(unsigned int value)
{
unsigned int x, y;
for(x=0;x<1275;x++)
for(y=0;y<value;y++);
}

Serial Communication with PC using 8051

#include<reg51.h>
sbit MYSW=P2^0;
void main(void)
{
unsigned char z;
unsigned char fname[]=" Abha ";
unsigned char lname[]=" Singh ";
TMOD=0x20;
TH1=0xFD;
SCON=0x50;
TR1=1;
if(MYSW==0)
{
for(z=0;z<10;z++)
{
SBUF=fname[z];
while(TI==0);
TI=0;
}
}
else
{
for(z=0;z<15;z++)
{
SBUF=lname[z];
while(TI==0);
TI=0;
}
}
}

Interfacing LCD and Keypad with 8051

#include <reg51.h>

#define COL P2
#define ROW P0
#define LCD P3
sbit rs = P1^5;
sbit rw = P1^6;
sbit en = P1^7;
sbit refresh = P1^4;

void MSDelay(unsigned int vaulue);
void lcdcmd(unsigned char value);
void lcddata(unsigned char value);

unsigned char keypad[4][4]= {'0','1','2','3',
'4','5','6','7',
'8','9','A','B',
'C','D','E','F'};
void main()
{
//refresh=1;
unsigned char colloc, rowloc;
restart:
lcdcmd(0x38);
MSDelay(250);
lcdcmd(0x0E);
MSDelay(250);
lcdcmd(0x01);
MSDelay(250);
lcdcmd(0x06);
MSDelay(250);
lcdcmd(0x80);
COL=0xFF;
while(1)
{
if(refresh==0)
{
goto restart;
}
do
{
ROW=0x00;
colloc =COL;
colloc &=0x0F;
}
while(colloc!=0x0F);
do
{
do
{
MSDelay(20);
colloc=COL;
colloc&=0x0F;
}
while(colloc==0x0F);
MSDelay(20);
colloc=COL;
colloc&=0x0F;
}
while(colloc==0x0F);
while(1)
{
ROW=0xFE;
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=0;
break;
}

ROW=0xFD;
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=1;
break;
}

ROW=0xFB;
colloc=COL;
colloc&=0x0F;
if(colloc!=0x0F)
{
rowloc=2;
break;
}

ROW=0xF7;
colloc=COL;
colloc&=0x0F;
rowloc=3;
break;
}

if (colloc==0x0E)
{ lcddata(keypad[rowloc][0]);
MSDelay(250); }
else if(colloc==0x0D)
{ lcddata(keypad[rowloc][1]);
MSDelay(250); }
else if(colloc==0x0B)
{ lcddata(keypad[rowloc][2]);
MSDelay(250); }
else
{ lcddata(keypad[rowloc][3]);
MSDelay(250); }
}

}

void lcdcmd(unsigned char value)
{
LCD = value;
rs=0;
rw=0;
en=1;
MSDelay(1);
en=0;
return;
}

void lcddata(unsigned char value)
{
LCD = value;
rs=1;
rw=0;
en=1;
MSDelay(1);
en=0;
return;
}

void MSDelay(unsigned int value)
{
unsigned int x, y;
for(x=0;x<1275;x++)
for(y=0;y<value;y++);
}

Interfacing LCD with 8051

//Program to display String on LCD

#include<reg51.h>
#define lcd_data_pin P1 // data port P2
sbit rs=P2^0; // Register select pin
sbit rw=P2^1; // Read write pin
sbit en=P2^2; // Enable pin
void delay(unsigned int msec) //delay function
{
int i,j;
for(i=0;i<msec;i++)
for(j=0;j<1275;j++);
}
void lcd_command(unsigned char comm) // function to send command to LCD
{
lcd_data_pin=comm;
en=1;
rs=0;
rw=0;
delay(1);
en=0;
}
void lcd_data(unsigned char disp) // function to send data on LCD
{
lcd_data_pin=disp;
en=1;
rs=1;
rw=0;
delay(1);
en=0;
}

lcd_dataa(unsigned char *disp) // function to send string to LCD
{
int x;
for(x=0;disp[x]!=0;x++)
{
lcd_data(disp[x]);

}
}

void lcd_ini() //Function to inisialize the LCD
{
lcd_command(0x38);
delay(5);
lcd_command(0x0F);
delay(5);
lcd_command(0x80);
delay(5);

}
void main()
{
lcd_ini();
lcd_dataa("ABHA SINGH");
}

Introduction

RFID

Introduction

IR Transmitter-Reciever

Introduction

Android Apps for Project

Introduction

GSM Module

Introduction

GPS Module

Introduction

Xbee (Zigbee) Module

Introduction

DC Motor

Introduction

Stepper Motor

Introduction

LEDs and Switches

We do basic and first program on any microcontroller of LED blinking.

Keypad

Introduction
Keypad and Serial Communication with PC using 8051
Interfacing LCD and Keypad with 8051

LCD (Liquid Crystal Display)

Temperature Sensors: LM35

Introduction
Celsius scale digital thermometer using AT89C51

ADC0804

Celsius scale digital thermometer using AT89C51

Circuit

Code:

//Program to make a digital thermometer with display in centigrade scale

#include<reg51.h>

#define port P3

#define adc_input P1

#define dataport P0

#define sec 100

sbit rs = port^0;

sbit rw = port^1;

sbit e = port^2;

sbit wr= port^3;

sbit rd= port^4;

sbit intr= port^5;

int test_intermediate3=0, test_final=0,test_intermediate1[10],test_intermediate2[3]={0,0,0};

void delay(unsigned int msec )

{

int i ,j ;

for(i=0;i<msec;i++)

for(j=0; j<1275; j++);

}

void lcd_cmd(unsigned char item) //Function to send command to LCD

{

dataport = item;

rs= 0;

rw=0;

e=1;

delay(1);

e=0;

return;

}

void lcd_data(unsigned char item) //Function to send data to LCD

{

dataport = item;

rs= 1;

rw=0;

e=1;

delay(1);

e=0;

//delay(100);

return;

}

void lcd_data_string(unsigned char *str) // Function to send string to LCD

{

int i=0;

while(str[i]!='\0')

{

lcd_data(str[i]);

i++;

delay(10);

}

return;

}

void shape() // Function to create the shape of degree

{

lcd_cmd(64);

lcd_data(2);

lcd_data(5);

lcd_data(2);

lcd_data(0);

}

void convert() // Function to convert the values of ADC into numeric value to be sent to LCD

{

int s;

test_final=test_intermediate3;

lcd_cmd(0xc1);

delay(2);

lcd_data_string("TEMP:");

s=test_final/100;

test_final=test_final%100;

lcd_cmd(0xc8);

if(s!=0)

lcd_data(s+48);

else

lcd_cmd(0x06);

s=test_final/10;

test_final=test_final%10;

lcd_data(s+48);

lcd_data(test_final+48);

lcd_data(0);

lcd_data('c');

lcd_data(' ');

delay(2);

}

void main()

{

int i,j;

adc_input=0xff;

lcd_cmd(0x38);

lcd_cmd(0x0c); //Display On, Cursor Blinking

delay(2);

lcd_cmd(0x01); // Clear Screen

delay(2);

while(1)

{

for(j=0;j<3;j++)

{

for(i=0;i<10;i++)

{

delay(1);

rd=1;

wr=0;

delay(1);

wr=1;

while(intr==1);

rd=0;

lcd_cmd(0x88);

test_intermediate1[i]=adc_input/10;

delay(1);

intr=1;

}

for(i=0;i<10;i++)

test_intermediate2[j]=test_intermediate1[i]+test_intermediate2[j];

}

test_intermediate2[0]=test_intermediate2[0]/3;

test_intermediate2[1]=test_intermediate2[1]/3;

test_intermediate2[2]=test_intermediate2[2]/3;

test_intermediate3=test_intermediate2[0]+test_intermediate2[1]+test_intermediate2[2];

shape();

convert();

}

ADC0804: Introduction

FEATURES

• Compatible with 8080 μP derivatives – no interfacing logic needed – access time 135 ns

• Easy interface to all microprocessors, or operates “stand alone”

• Differential analog voltage inputs

• Logic inputs and outputs meet both MOS and TTL voltage level specifications

• Works with 2.5V (LM336) voltage reference

• On-chip clock generator

• 0V to 5V analog input voltage range with single 5V supply

• No zero adjust required

• 0.3" standard width 20-pin DIP package resolution.

• 20-pin molded chip carrier or small outline package

• Operates ratiometrically or with 5 VDC, 2.5 VDC, or analog span adjusted voltage reference

Pin Description

With PC

Serial Communication with PC using 8051

Keypad and Serial Communication with PC using 8051

With Bluetooth

Remote monitoring Electrical Devices using Bluetooth and Smartphone

Pages

Tuesday, 20 August 2013

Sunday, 4 August 2013

Circuit

Code:

With PC

With Bluetooth

With Xbee (Zigbee)