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tachakorn
Joined: 15 Sep 2010
Posts: 4
Location: 42/70 MOO2 JANGWATTANA RD.BKK
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| Please help PIC16F676 CODE to detect temp LM335 |
 Posted: Wed Mar 09, 2011 8:36 am |
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I need to convert code ADC from 0-5v to measure temp by LM335 temp from 0-99' C. And voltage range from LM335 2.73V - 3.72V. And formula convert LM335 from VZ to Temp('C) Vz = TK(10mV/oK).
TK เป็น Degree Kelvin
Vz = (273 + TC)(10mV/oC)
TC is Degree Celsius
My code use PIC16F676 3 DIGIT COMMON ANODE 7 segment (ADC 0-5V.)
| Code: |
#include <16F676.h>
#device adc=10
#fuses INTRC_IO,NOWDT,PUT,NOPROTECT,BROWNOUT,NOMCLR
#use delay (clock=4000000) // 4MHz clock
#rom 0x3ff={0x3444}
#byte PORTA = 0x05
#byte PORTC = 0x07
#byte TRISA = 0x85
#byte TRISC = 0x87
#define SPORTA PORTA
#define SPORTC PORTC
#define TICKS_BETWEEN_INTERRUPTS 5000 //5000
#define INTERRUPT_OVERHEAD 35
#define TMR1RESET (0xFFFF-(TICKS_BETWEEN_INTERRUPTS-INTERRUPT_OVERHEAD))
const char SegCode[11] = {0x40,0x57,0x22,0x06,0x15,0x0C,0x08,0x56,0x00,0x04,0xFF};
// 0 1 2 3 4 5 6 7 8 9
const char Column[3] = {0x02,0x01,0x04};
static char Segment[3] = {0x7f,0x7f,0x7f};
static unsigned char ColCount=0x00;
void CPU_SETUP(void);
void Display(void);
void HTO7S(unsigned int32 Num);
byte i;
unsigned int32 result;
#INT_TIMER1
void Timer1(void)
{
set_timer1(TMR1RESET);
Display();
}
void main()
{
unsigned char i;
CPU_SETUP();
while(true)
{
result=0;
for (i=0;i<20;i++)
{
set_adc_channel(3);
delay_ms(1);
result=result+read_adc();
}
//result = 0x3fe;
HTO7S(result/20);
delay_ms(200);
}
}
void CPU_SETUP()
{
setup_comparator(NC_NC_NC_NC); // not use comparator module
setup_adc_ports( sAN3 | VSS_VDD);
setup_adc(ADC_CLOCK_DIV_64);
TRISA=0b00011000;
PORTA=0x27;
TRISC=0b00000000;
PORTC=0x37;
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
set_timer1(TMR1RESET);
enable_interrupts(GLOBAL);
enable_interrupts(INT_TIMER1);
}
//-------------------------------------
// Display routine
//-------------------------------------
void Display()
{
PORTA = 0b00100111; // off all digits column and Segment G
PORTC = 0b00111111; // off segment a-f
delay_cycles(2);
if (ColCount>=3)
ColCount=0;
SPORTC = Segment[ColCount];
SPORTA = ((Segment[ColCount] & 0b01000000)>>1) | (Column[ColCount]^0x07);
ColCount++;
}
//--------------------------------------
// Convet HEX 2 byte to 7-Segment code
//--------------------------------------
void HTO7S(unsigned int32 Num)
{
unsigned int32 res;
Segment[0]=SegCode[5*Num/1023];
if (Segment[0]==0x40)
Segment[0]=0xFF;
res = 5*Num%1023;
Segment[1]=SegCode[100*res/10230];
res=100*res%10230;
Segment[2]=SegCode[10*res/10230];
} |
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tachakorn
Joined: 15 Sep 2010
Posts: 4
Location: 42/70 MOO2 JANGWATTANA RD.BKK
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| Please help PIC16F676 CODE to detect temp LM335 |
| Posted: Sat Mar 12, 2011 7:28 am |
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Any one can help me sir.
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tachakorn
Joined: 15 Sep 2010
Posts: 4
Location: 42/70 MOO2 JANGWATTANA RD.BKK
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| I hope show my circuit PIC16F676 with LM335 |
| Posted: Sat Mar 12, 2011 7:40 am |
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I need some one help sir.
I do not know how to show my circuit.
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tachakorn
Joined: 15 Sep 2010
Posts: 4
Location: 42/70 MOO2 JANGWATTANA RD.BKK
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| Please help PIC16F676 CODE to detect temp LM335 |
| Posted: Sat Mar 12, 2011 9:05 am |
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I know answer after read CCS forum my code it success and can show temp at
0-99'c my code
| Code: |
#include <16F676.h>
#device adc=10
#fuses INTRC_IO,NOWDT,PUT,NOPROTECT,BROWNOUT,NOMCLR
#use delay (clock=4000000) // 4MHz clock
#rom 0x3ff={0x3444}
#byte PORTA = 0x05
#byte PORTC = 0x07
#byte TRISA = 0x85
#byte TRISC = 0x87
#define SPORTA PORTA
#define SPORTC PORTC
#define TICKS_BETWEEN_INTERRUPTS 5000 //5000
#define INTERRUPT_OVERHEAD 35
#define TMR1RESET (0xFFFF-(TICKS_BETWEEN_INTERRUPTS-INTERRUPT_OVERHEAD))
const char SegCode[11] = {0x40,0x57,0x22,0x06,0x15,0x0C,0x08,0x56,0x00,0x04,0xFF};
// 0 1 2 3 4 5 6 7 8 9
const char Column[3] = {0x02,0x01,0x04};
static char Segment[3] = {0x7f,0x7f,0x7f};
static unsigned char ColCount=0x00;
void CPU_SETUP(void);
void Display(void);
void HTO7S(unsigned int32 Num);
byte i;
unsigned int32 result;
#INT_TIMER1
void Timer1(void)
{
set_timer1(TMR1RESET);
Display();
}
void main()
{
unsigned char i;
CPU_SETUP();
while(true)
{
result=0;
for (i=0;i<20;i++)
{
set_adc_channel(3);
delay_ms(1);
result=result+read_adc();
result=(result-559L); //this code from ccs forum
}
//result = 0x3fe;
HTO7S(result/2); //this code from ccs forum
delay_ms(200);
}
}
void CPU_SETUP()
{
setup_comparator(NC_NC_NC_NC); // not use comparator module
setup_adc_ports( sAN3 | VSS_VDD);
setup_adc(ADC_CLOCK_DIV_64);
TRISA=0b00011000;
PORTA=0x27;
TRISC=0b00000000;
PORTC=0x37;
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);
set_timer1(TMR1RESET);
enable_interrupts(GLOBAL);
enable_interrupts(INT_TIMER1);
}
//-------------------------------------
// Display routine
//-------------------------------------
void Display()
{
PORTA = 0b00100111; // off all digits column and Segment G
PORTC = 0b00111111; // off segment a-f
delay_cycles(2);
if (ColCount>=3)
ColCount=0;
SPORTC = Segment[ColCount];
SPORTA = ((Segment[ColCount] & 0b01000000)>>1) | (Column[ColCount]^0x07);
ColCount++;
}
//--------------------------------------
// Convet HEX 2 byte to 7-Segment code
//--------------------------------------
void HTO7S(unsigned int32 Num)
{
unsigned int32 res;
Segment[0]=SegCode[5*Num/1023];
if (Segment[0]==0x40)
Segment[0]=0xFF;
res = (5*Num%1023);
Segment[1]=SegCode[100*res/10230];
res=(100*res%10230);
Segment[2]=SegCode[10*res/10230];
} |
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