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delifadzli
Joined: 12 Apr 2010
Posts: 27
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| please help on LM35 code... |
 Posted: Mon Apr 12, 2010 12:23 am |
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Here is sample source that I have made using PCW C compiler. Its about simple code on LM35 + LCD operation.
This source explain about the temperature which being detect by LM35 and display to LCD.
Here I wanna ask.... isn't this code can be used?
Since when I compile there is no error.....
| Code: |
#include <16f877a.h>
#device ADC=10
#FUSES HS,NOWDT,NOPROTECT,NOLVP
#USE DELAY (CLOCK=20000000)
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <lcd.c>
//Define parameter
unsigned int temp_adc=0;
char L;
float temp;
void main()
{
set_tris_D(0x00); // Config PORTD for LCD display.
setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_INTERNAL); // All channels are config as analog I/p.
lcd_init();
printf (L, "Temperature is:");
//procedure ADC
while(1)
{
temp_adc=read_adc();
temp= 5*temp_adc*(100.00/1023.00);
lcd_gotoxy(1,1);
lcd_putc('\f');
printf(lcd_putc,"Temp is:%f",temp);
delay_ms(50);
}
} |
I hope someone respond...
If there's no error, perhaps I will be concentrating more on the hardware part.
Some detail on my diagram...sorry the diagram can't be drawn...I don't know.
When I try to run it....the lcd doesn't show any result.
pin MCLR---connect to 5v
pin LM35- pin ANO
For lcd:
| Quote: |
pin 1- Gnd
pin2- 5 v
pin 3- variable resistor 470 k
pin 4- RD0
pin 5- gnd
pin 6-RD1
pin 11- RD4
pin12-RD5
Pin13-RD6
Pin14-RD7
Pin15-5 v
pin16-Gnd
pin 13-osc1--directly goes to oscillator 10mhz
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Please help me. I'm new in programming. Please. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19538
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| Posted: Mon Apr 12, 2010 4:29 am |
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There are several things wrong with the code. Some minor, some major, and some just in comments.
Start with 'L'. This is defined as a character. You then use printf, with this given to the printff function as if this is the name of a function. It isn't. If you want to send the data to a _string_, then you should be using sprintf, not printf, and 'L' needs to be an array of characters. As written, it is garbage.
Then you have a comment 'All channels are config as analog I/p'. They aren't. Only AN0 is set as an analog by the statement on the line before.
Then you select 'ADC_CLOCK_INTERNAL'. Read the data sheet. This option is _not_ recommended for use above 1MHz processor clock. This won't stop the code working, but will degrade accuracy.
Then you never select an ADC channel to use. It _may_ default to the one channel you have selected, but normally most register bits default to '1', rather than '0', so I'd not expect it to.
Then 'temp_adc', is defined as an 'int'. In CCS, by default, an 'int' is 0 to 255. Your adc outout is 0-1023. You need a larger type here.
Best Wishes |
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delifadzli
Joined: 12 Apr 2010
Posts: 27
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| Posted: Mon Apr 12, 2010 5:33 am |
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thanks for the respond...i will try to adjust the code.....hopefully with ur guidance....it will works....thanks anyway...  |
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