[ANJUSHA]

once see the l293d driver internal circuit, its a h-bridge….

one driver can drive 2 motors

and for PWM technique refer "OcFreaks LPC2148 PWM TECHNIQUE". It will be very helpful….

[ANJUSHA]

i dont exactly about the concept ur asking…..just refer "ocfreaks lpc2148  " it might give an idea for you.

[ANJUSHA]

There is no inbuilt ADC in 8051….

 

1) so, first select ADC chip which should be interfaced to 8051…ex:ADC0804, TO This chip is connected to the sensor and try for ADC interfacing programming….of 8051

 

microcontroller to PC

 

1) to connect the kit to PC…..Make use of MAX232 in between kit and computer, and try for UART  programming……of 8051

 

just once try it,ok

[ANJUSHA]

Thank you sir..i am inerested to learn and develop a programmer circuit .As a beginner

thinking that 8051 is basic microcontroller…i thought to develop programmer circuit for AT89s51.

 

so, can you suggest me how to learn ,to develop a programmer circuit…

 

and what should i learn first?

 

 

 

[ANJUSHA]

thank you sir. i understand how relations between different clocks like pclk,cclk..in ARM

[ANJUSHA]

thank you so  much.i understand well…. sir i tried with 8051,its ok..but in ARM7 LPC2148 controller, there are two frequencies.one is crystal frequency =12MHz   and  PCLK(pheripheral clock)=30MHz, where (VPBDIV=0X02 i.e    1/4 of the default PLL output=60MHz )….now my doubt is which frequency we have to consider in  performing PWM  in this controller and let me know how? how frequency and Ton and Toff are related and with which frequency?

[ANJUSHA]

 

 

thank you for guiding me….

 

i came to know on what basis we hav to select motor related to a application.

[ANJUSHA]

 

 

 

 

 you have taken port1 for passing commands

and port2 for data but for lcd we consider 8/4 data pins …then how can you make use same 8 pins for port1 and for port2..so consider any one port.

 

so take port2/port1.use command 0x01 to clear the display before 0x80 and b/w every command in intializing lcd use delay;

 

 

[ANJUSHA]

 

    hello sir,

 

         i calculated and i got it…i taken pclk as 30MHZ, by considering VPBCLK as 0x02;

[ANJUSHA]

 

thank you sir for guiding in  interfacing resistive touch screen to 2148.i suceccfully interfaced and i am getting readings also in serial terminal.

sir,i want to create a wheel chair with dc motors…i was unable to select motor regarding  rpm and how much voltage required to drive…..if

 

load == (wheel chair + person of 30kg) has to be handled by that dc motor..can you kindly suggest me the specifications of which type of dc motor has to  be selected.please sir.,,right now i interfaced 150rpm dc motor…its working..but i want to make project some what nearer to realistic.help me sir.

[ANJUSHA]

thank you sir.

[ANJUSHA]

hello sir

      i  included the code i written for 4-bit lcd…i mean to say that i can observe ,whethet that pin is getting data as per program,on peripheral window of port0 and port 1..and again i tested using proteus….choosing microcontroller and 16×2 lcd..output is not getting.just lcd contrast light is glowing.no cursor blinking….sir can u check whether initial commanda for 4_bit lcd are correct? and solve this problem sir…i wi be thankful to you.

[ANJUSHA]

[ANJUSHA]

#include <LPC21xx.H>
void delay(int count ) ;
void lcddata(int c);
void lcdcmd(int t);

void delay(int count)
        {
        int j=0, i=0;
        for (j=0;j<count;j++)
        for (i=0;i<250;i++);
        }

void lcdcmd(int t)
{
 
int s=0;
s=(t>>4) & 0x0f;
s=s << 16;
 
IO0CLR=0x10000000;    // rs =0 p0.28
IO0CLR=0x20000000;    // rw =0 p0.29
IO0SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = s;
delay(1000);
IO0CLR=0x40000000; //en=0 p0.30
 
s = t & 0x0f;
s=s<<16;

IO0CLR=0x10000000;    // rs =1 p0.28
IO0CLR=0x20000000;    // rw =0 p0.29
IO0SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = s;
delay(1000);
IO0CLR=0x40000000; //en=0 p0.30
}

void lcddata(int c)
{
int d=0;
d=((c>>4) & 0x0f);
d= d<<16;
 
IO0SET=0x10000000;    // rs =1 p0.28
IO0CLR=0x20000000;    // rw =0 p0.29
IO0SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = d;
delay(1000);
IO0CLR=0x40000000; //en=0 p0.30
 
d= c & 0x0f;
d=d<<16;

IO0SET=0x10000000;    // rs =1 p0.28
IO0CLR=0x20000000;    // rw =0 p0.29
IO0SET=0x40000000;

IO1CLR=0X000F0000;
IO1SET = d;
delay(1000);
IO0CLR=0x40000000; //en=0 p0.30
}

void msgdisplay(unsigned char k[])
{
int i;
for(i=0; k!=’’; i++)
{
lcddata(k);
delay(1000);
}
}

int main( )
{
PINSEL1=0X00000000;
PINSEL2=0X00000000;
IO0DIR=0X70000000;
IO1DIR=0X000f0000;
delay(100);

lcdcmd(0x02);
lcdcmd(0x28);
lcdcmd(0x0c);
lcdcmd(0x06);
lcdcmd(0x01);

 

while(1)
{

msgdisplay(“INFORMATION”);
delay(1000);
//lcdcmd(0xc0);
//msgdisplay(“HYDERABAD”);
//delay(1000);
}

}

[ANJUSHA]

 

sir,what about servo motors? our guide suggested once go for servo motors.wil they support for more load.

can you tell me.for  load of a almost equal to person with weight 30kg….considering as example ..can you give me specifications for a dc motor.

 

secondly.if ex: load is 5kg…can you provide dc motor specifications like rpm,voltage,driving current required for load.

[Author]

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