Using ADC n PWM to light up the LED dimmer - need help

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jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

22 Jun 2009 7:22 i am doing ADC

i nid help in ADC n PWM.. my project is to make the LED dimmer using ADC n PWM.. isit possible?

aanand_44

Joined: 25 Jul 2007
Posts: 24
Helped: 2
Location: India

22 Jun 2009 9:53 Re: i am doing ADC

Hi,
It is possible. which controller you are going to use this project?

U can modify the your duty cycle wit reference to ADC value.

Give me details I'll give u solution.

Regards,
Anand.A

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

22 Jun 2009 10:00 Re: i am doing ADC

using ADC n PWM to light up the LED dimmer.. i using c8051f226dk.. give mi solution... erm i using microcontroller 8051 IC chip.. i gt the attachment help mi. and i attach to PDF file take a look

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jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

22 Jun 2009 10:06 Re: i am doing ADC

i gt the board sample oso.. is attach to tis.. take a look ba.. i dunno anyting abt tis.. help

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blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

22 Jun 2009 12:40 i am doing ADC

You want someone to write your homework code for you?

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

22 Jun 2009 15:51 Re: i am doing ADC

if possible give mi the code i will study myself or i ask some question..cos i have no idea... if possible if cannot den jus teach mi will do..

a)my procedures is develop firmware for ADC to acquire potentiometer setting
b)develop firmware for PWM generation
c)integrate ADC acquistion for PWM generation
d) develop current driver circuit for LED.. any idea? can help to slove?

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

23 Jun 2009 3:37 Re: i am doing ADC

can help mi? i jus wan some guide n i will learn myself.. jus give mi some hint will do.. den i learn myself.. i have a variable resister also and i dunno put where or connect where?

Added after 54 minutes:

can someone guide mi and give some hint.. i need urgent.. i need guide

mfarooq1

Joined: 09 Jan 2009
Posts: 87
Helped: 4

23 Jun 2009 11:54 Re: i am doing ADC

Hi
see the circuit in PDF and design in orcad. you can see the ADC connection with MCU and variable resistor. feel free to ask questions

Added after 58 seconds:

ADC circuit and Design in OrCad

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jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

23 Jun 2009 15:59 Re: i am doing ADC

erm hw to do the program using ADC n PWM to generate the LEd dimmer? using c8051f226dk. hw does it wrk? tel mi more and the code i wanted dunno correct anot.. u have the datasheet rite? den can help mi? if possible i give u wat i have type and let u take a look?

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

23 Jun 2009 17:54 i am doing ADC

When's it due?

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

23 Jun 2009 18:44 Re: i am doing ADC

thank for replying mi. next week monday.. can help mi ma? i need it urgent because i have no idea what to do also.. cos first time handle this project.. thank.

best regard

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

23 Jun 2009 20:20 i am doing ADC

Perhaps you should try something simpler for your first project. Flashing an LED is good.

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

24 Jun 2009 1:54 Re: i am doing ADC

i alreadi start the flashing the LED wish can work. and now i wan go another steps which is going to do ADC but i don't have any idea about ADC.. so can give some guide? following is my PDF file name.. is my data sheet and kinda help mi abit. thank for replying mi..

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jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

30 Jun 2009 2:50 Re: i am doing ADC

help help mi..

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 3:44 Re: i am doing ADC

jason1987 wrote:

help help mi..

Sounds like a line from the Beatles song.

Your attached file C8051F2xx.pdf is nothing more than the datasheet.

Last edited by blueroomelectronics on 30 Jun 2009 3:47; edited 1 time in total

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

30 Jun 2009 3:47 Re: i am doing ADC

i am doing ADC and PWM to generate a LED dim.. anyone can help mi? urgent

what does the below code do?

#include<c8051f200.h>

//definitions
sbit LED = P2^4;

void adc_init(); //to initialize adc
void port_init(); //to initialize the ports

void main()
{

unsigned int index=0, total_period= (unsigned int) 255*256, on_time=0;
port_init();
adc_init();

// disable watchdog timer
WDTCN = 0xde;
WDTCN = 0xad;

{
ADBUSY = 0x01; //starts the adc conversion
while(ADCINT); //polling for ADCINT which tells us the end of conversion
ADCINT = 0x00;
on_time = ((unsigned int)ADC0H)*256;
for ( index = 0 ; index < total_period ; index++)
{
if (on_time--)
{
LED = 0x01; //switching on the LED

}

else
{
LED = 0x00; //switching off the LED
}
}
}
}

void adc_init ()

{
AMX0SL = 0x3f; // enable AMUX & configure for p3.7 as i/p pin
ADC0CF = 0x60; // set conversion clk at one sys clk and PGA at gain =1
ADC0CN = 0xC0; // ADC is enabled and ADBUSY=0 (changed here)
REF0CN = 0x03; // VDD is selected as Vref. Here are you using VDD for variable resistor also?
}
void port_init()
{
P3MODE = 0X7F; // Except the P3.7 pin all are configured as digital I/O
}

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 3:48 i am doing ADC

Where did you get the code?

Try running it.

When's it due?

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

30 Jun 2009 3:53 Re: i am doing ADC

i run the code but nothing happen.. hw come? and i have connect mine variable resistor to the ADC input but nothing happen.. y? any idea? what does the code do?

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blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 4:09 i am doing ADC

Where did you get the code from?

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

30 Jun 2009 4:10 Re: i am doing ADC

from my teacher.. i need to understand.. give some guide

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 4:12 i am doing ADC

Then why not ask your teacher to explain it.

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

30 Jun 2009 4:14 Re: i am doing ADC

thank for the replying mi, if he will explain to mi den i post here for what?

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 4:19 i am doing ADC

The comments in the code tell what the code is doing.

Your teacher gave this to you to debug so you could learn to program.

Do you not know how to program in C ?

jason1987

Joined: 22 Jun 2009
Posts: 69
Location: japan

30 Jun 2009 4:22 Re: i am doing ADC

i dunno hw to program in C.. and i have a hex file.. how to download to the board using silicon software? what kind of result if i download the code to ther board? and kinda tell mi the code what he is doin?

#include<c8051f200.h>

//definitions
sbit LED = P2^4;

void adc_init(); //to initialize adc
void port_init(); //to initialize the ports

void main()
{

unsigned int index=0, total_period= (unsigned int) 255*256, on_time=0;
port_init();
adc_init();

// disable watchdog timer
WDTCN = 0xde;
WDTCN = 0xad;

{
ADBUSY = 0x01; //starts the adc conversion
while(ADCINT); //polling for ADCINT which tells us the end of conversion
ADCINT = 0x00;
on_time = ((unsigned int)ADC0H)*256;
for ( index = 0 ; index < total_period ; index++)
{
if (on_time--)
{
LED = 0x01; //switching on the LED

}

else
{
LED = 0x00; //switching off the LED
}
}
}
}

void adc_init ()

{
AMX0SL = 0x3f; // enable AMUX & configure for p3.7 as i/p pin
ADC0CF = 0x60; // set conversion clk at one sys clk and PGA at gain =1
ADC0CN = 0xC0; // ADC is enabled and ADBUSY=0 (changed here)
REF0CN = 0x03; // VDD is selected as Vref. Here are you using VDD for variable resistor also?
}
void port_init()
{
P3MODE = 0X7F; // Except the P3.7 pin all are configured as digital I/O
}

blueroomelectronics

Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada

30 Jun 2009 4:27 i am doing ADC

You have to compile the code first. Makes no sense your teacher would expect you to be able to understand the code if you can't program in C

I recommend a getting a book on C

PS what does "mi" mean?