 |
 |
| View previous topic :: View next topic |
| Author |
Message |
[email protected]
Guest
|
| ADC not working in 16f676 |
 Posted: Sun Sep 14, 2008 11:40 am |
 |
|
The ADC is not working properly in PIC16F6776.
The following is the code I have tried:
| Code: | #include <16F688.h>
#fuses HS, MCLR
#DEVICE ADC=10
#use delay(clock=20000000)
int16 ch_result=0;
void main() {
SETUP_COMPARATOR(NC_NC_NC_NC);
setup_vref(FALSE);
SET_TRIS_A( 0x00 );
set_TRIS_C(0x0f);
setup_adc_ports( sAN1 | VSS_VDD);
setup_adc( ADC_CLOCK_INTERNAL );
set_adc_channel(1);
delay_ms(10);
while(1)
{
ch_result=0;
ch_result=read_adc();
delay_ms(100);
ch_result&=0xfff8;
if(ch_result>=3)
{
output_high(PIN_A0);
delay_ms(100);
if(input(PIN_C0))
{
delay_ms(1);
if(!input(PIN_C3))
{ delay_ms(1);
output_high(PIN_C4);
}
else if(input(PIN_C3))
{
output_low(PIN_C4);
output_low(PIN_C5);
output_low(PIN_A2);
}
}
else if(!input(PIN_C0))
{
output_low(PIN_C4);
output_low(PIN_C5);
output_low(PIN_A2);
}
if(!input(PIN_C1))
{
delay_ms(1);
if(!input(PIN_C3))
{
delay_ms(1);
output_high(PIN_C4);
output_high(PIN_A2);
}
else if(input(PIN_C3))
{
output_low(PIN_C4);
output_low(PIN_C5);
output_low(PIN_A2);
}
}
else if(input(PIN_C1))
{
output_low(PIN_A2);
}
if(!input(PIN_C2))
{
delay_ms(1);
if(!input(PIN_C3))
{
delay_ms(1);
output_high(PIN_C4);
output_high(PIN_C5);
output_high(PIN_A2);
}
else if(input(PIN_C3))
{
output_low(PIN_C4);
output_low(PIN_C5);
output_low(PIN_A2);
}
}
else if(input(PIN_C2))
{
output_low(PIN_C5);
}
}
else
{
output_low(PIN_A0);
output_low(PIN_C4);
output_low(PIN_C5);
output_low(PIN_A2);
}
}
} |
The input channel gets loaded i.e., when I apply 0.4V as input, and testing in the pin at channel, the input current draws. I don't know the reason. Can any body help ? |
|
 |
Ttelmah
Guest
|
|
| Posted: Sun Sep 14, 2008 1:25 pm |
|
|
What chip are you actually using?.
You say '16F6776' - no such chip. If you mean 16F676, the code is being compiled for a 16F688. Needs to be corrected...
The pin you use as an ADC input, needs to be set as an input, not an output. Either set it correctly, or remove the TRIS statements (the compiler will set TRIS for you).
As a 'comment', (not causing the problem, but will cause inaccuracy problems), look in the data sheet, for what ADC clocks are legal. If this is the 676, Note 4, under table 7-1.
Best Wishes |
|
|
[email protected]
Guest
|
| regarding PC16F676 |
| Posted: Sun Sep 14, 2008 10:49 pm |
|
|
| Ttelmah wrote: | What chip are you actually using?.
You say '16F6776' - no such chip. If you mean 16F676, the code is being compiled for a 16F688. Needs to be corrected...
The pin you use as an ADC input, needs to be set as an input, not an output. Either set it correctly, or remove the TRIS statements (the compiler will set TRIS for you).
As a 'comment', (not causing the problem, but will cause inaccuracy problems), look in the data sheet, for what ADC clocks are legal. If this is the 676, Note 4, under table 7-1.
Best Wishes |
thank you sir i got the result |
|
|
[email protected]
Guest
|
| flicker problem |
| Posted: Mon Sep 15, 2008 1:50 am |
|
|
Using PIC 16f676 I activate an output if the input occurs. Now I have problem when I switch on my circuit power unnecessarily the o/p goes high.
ie it flickers each time when I switch on my power.
But it does not happen when I am using PIC16F677A.
Can I know the reason ?
How can I rectify this problem ? |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
