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sunny
Joined: 13 Feb 2009
Posts: 3
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| newbies in C language |
 Posted: Fri Feb 27, 2009 9:15 pm |
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hi everyone...
i am really new in this stuff..i need to compare two set of voltage using pic 16f877A..how do i achieve this... |
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IceMetal
Joined: 20 Nov 2008
Posts: 79
Location: white Plains, NY
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| Posted: Fri Feb 27, 2009 9:45 pm |
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| you will need to start looking at ADC samples, whats the voltage range that you have? |
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sunny
Joined: 13 Feb 2009
Posts: 3
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| Posted: Fri Feb 27, 2009 10:15 pm |
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| my voltage range is between 5V to 25V..thanks..i should try... |
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sunny
Joined: 13 Feb 2009
Posts: 3
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| Posted: Tue Mar 03, 2009 2:14 am |
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This is my code. How can I refer to reference voltage and compare it with input voltage ? Does it have special code or something ?
| Code: |
#if defined(__PCM__)
#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#elif defined(__PCH__)
#include <18F452.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)
#endif
#define LED pin_A5
void main() {
int ref,voltage;
setup_port_a( RA0_RA1_ANALOG_RA3_REF );
setup_adc( ADC_CLOCK_INTERNAL );
set_adc_channel( 0 );
ref=5;
while(true){
voltage=read_adc();
if(voltage>ref){
output_high(LED);
}
} |
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