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

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?

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

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

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

i am doing ADC

You want someone to write your homework code for you?

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?

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

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

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?

i am doing ADC

When's it due?

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

i am doing ADC

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

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..

Re: i am doing ADC

help help mi..

Re: i am doing ADC

jason1987 said:

help help mi..

Click to expand...

Sounds like a line from the Beatles song.

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

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
}

i am doing ADC

Where did you get the code?

Try running it.

When's it due?

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?

i am doing ADC

Where did you get the code from?

Re: i am doing ADC

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