[SOLVED] NEED HELP for ADC programming

[Chullaa]

Hi guys
i am very much biggner! Well i've started working with 16F877 adc modules..
bt i am confused abt the programming. how to set range of input from 0 to +5V and setting resolution...bla bla
could anyone please send me some simple programes in C. I am using PICC complier and Proteus 7.4 for circuit operation.
my work is attached!


long value;
void main()
{
setup_adc(ADC_CLOCK_INTERNAL);
setup_adc_ports(1);
setup_spi(SPI_SS_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);

TRISB=0x00;
adcon0=0x81;
adcon1=0xCE;

// TODO: USER CODE!!
while(1)
{
set_adc_channel(0);
delay_ms(100);
PORTB = read_adc();

}

}

 

[rajtech]

Hi guys
i am very much biggner! Well i've started working with 16F877 adc modules..
bt i am confused abt the programming. how to set range of input from 0 to +5V and setting resolution...bla bla
could anyone please send me some simple programes in C. I am using PICC complier and Proteus 7.4 for circuit operation.
my work is attached!


long value;
void main()
{
setup_adc(ADC_CLOCK_INTERNAL);
setup_adc_ports(1);
setup_spi(SPI_SS_DISABLED);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);

TRISB=0x00;
adcon0=0x81;
adcon1=0xCE;

// TODO: USER CODE!!
while(1)
{
set_adc_channel(0);
delay_ms(100);
PORTB = read_adc();

}

}

Hi,

Please connect VRef Pin to 5v if you want to adc input 0 to 5 v, if u want adc input 0 to 3v then connect Vref pin to 3v.

 

[Chullaa]

thanks Raj

i did that. but dint worked. Than i changed
PORTB = read_adc(); TO PORTB = ADRESL;
it worked. Wonder y