On Mar 4, 4:04 am, Novel <ntacao...@gmail.com> wrote:
> On 4 Mar, 05:06, linnix <m...@linnix.info-for.us> wrote:
>
> > On Mar 3, 3:35 pm, Novel <ntacao...@gmail.com> wrote:
>
> > > Now I am doing a pic thermometer which use the LM19 temperature sensor
> > > to measure the temperature and display on the 2*16 LCD without
> > > backlight.
> > > And I have a pic18f45k20 microcontroller chip and 4504N adc converter.
> > > I have connect the temp sensor to pin 9 of the pic18f45k20.
> > > Now I just want to ask who can give me help with the codes to let this
> > > system works.
> > > Thanks.
>
> > If you are using the internal A2D already, what are you using the
> > external A2D for? Double checking the PIC A2D?
>
> Thank you for answering me.
> Firstly, the address of datasheet of ADC converter ishttp://www.datasheetcatalog.com/datasheets_pdf/M/C/1/4/MC14504BCP.shtml.
> Secondly, the part number of LCD is PMC1602C-SYR.
> Thirdly, I really need ADC converter. What I need to do is to test
> the
> connection on the board and finally to finish on the PCB.
> Fourthly, I connect the Vout of the temp sesor to the AN6/WR#/RE1 pin
> 9 of the microchip_18F4XK20.
So, how do you hook up the 14504BCP?
Reply by Novel●March 4, 20092009-03-04
On 4 Mar, 05:06, linnix <m...@linnix.info-for.us> wrote:
> On Mar 3, 3:35 pm, Novel <ntacao...@gmail.com> wrote:
>
> > Now I am doing a pic thermometer which use the LM19 temperature sensor
> > to measure the temperature and display on the 2*16 LCD without
> > backlight.
> > And I have a pic18f45k20 microcontroller chip and 4504N adc converter.
> > I have connect the temp sensor to pin 9 of the pic18f45k20.
> > Now I just want to ask who can give me help with the codes to let this
> > system works.
> > Thanks.
>
> If you are using the internal A2D already, what are you using the
> external A2D for? =A0Double checking the PIC A2D?
Thank you for answering me.
Firstly, the address of datasheet of ADC converter is
http://www.datasheetcatalog.com/datasheets_pdf/M/C/1/4/MC14504BCP.shtml.
Secondly, the part number of LCD is PMC1602C-SYR.
Thirdly, I really need ADC converter. What I need to do is to test
the
connection on the board and finally to finish on the PCB.
Fourthly, I connect the Vout of the temp sesor to the AN6/WR#/RE1 pin
9 of the microchip_18F4XK20.
I never learned c language before, I feel difcult to work it out.
What
I want to know now is how to display the voltage value of the temp
sensor on the LCD. After that, I know how to use the eqn. for
temperature and voltage to show the temperature on the LCD.
The following was the code I have figure out. I could not going on
and
do not know whether they are right or wrong.
[Main.c]
#include "p18f45k20.h"
#include "delays.h"
#include "lcd.h"
#pragma udata // declare statically allocated uinitialized
variables
#pragma code // declare
executable instructions
void main (void)
{
// set internal oscillator to 4MHz
OSCCON =3D 0x50; // IRCFx =3D
101
OSCTUNEbits.PLLEN =3D 0; // x4 PLL
disabled
lcd_init(); //
initialise display
=
//
write first screen
lcd_goto(0x00); //
goto 1st line position 3
lcd_puts ("PIC
Thermometer"); // write string to
display
lcd_goto(0x44); //
second line position 4
lcd_puts ("Runnin..."); // write
second line
Delay10KTCYx(255); //
delay approx 2.5 Seconds
lcd_clear(); //
clear lcd
lcd_goto(0); // 1st
line position 1
lcd_puts("Temperature is:");
lcd_goto(0x40);
lcd_puts
("lalalala.."); =
//
I just use lalalala to inst. temperature what I want.
Delay10KTCYx(255); //
delay approx 2.5 Seconds
while(1);
}
void Timer0_Init(void)
{
INTCONbits.TMR0IF =3D 0; // clear roll-over interrupt flag
T0CON =3D 0b00000001; // prescale 1:4 - about 1 second
maximum delay.
TMR0H =3D 0; // clear timer - always write
upper byte first
TMR0L =3D 0;
T0CONbits.TMR0ON =3D 1; // start timer
}
void ADC_Init(void)
{
ANSEL =3D 0; //turn off all other analog inputs
ANSELH =3D 0;
ANSELbits.ANS6 =3D 1; // turn on RE1 analog
ADCON0 =3D 0b00011001;
}
unsigned char ADC_Convert(void)
{ // start an ADC conversion and return the 8 most-significant bits
of
the result
ADCON0bits.GO_DONE =3D 1; // start conversion
while (ADCON0bits.GO_DONE =3D=3D 1); // wait for it to complete
return ADRESH; // return high byte of result
Reply by linnix●March 4, 20092009-03-04
On Mar 3, 3:35 pm, Novel <ntacao...@gmail.com> wrote:
> Now I am doing a pic thermometer which use the LM19 temperature sensor
> to measure the temperature and display on the 2*16 LCD without
> backlight.
> And I have a pic18f45k20 microcontroller chip and 4504N adc converter.
> I have connect the temp sensor to pin 9 of the pic18f45k20.
> Now I just want to ask who can give me help with the codes to let this
> system works.
> Thanks.
If you are using the internal A2D already, what are you using the
external A2D for? Double checking the PIC A2D?
Reply by Novel●March 3, 20092009-03-03
Now I am doing a pic thermometer which use the LM19 temperature sensor
to measure the temperature and display on the 2*16 LCD without
backlight.
And I have a pic18f45k20 microcontroller chip and 4504N adc converter.
I have connect the temp sensor to pin 9 of the pic18f45k20.
Now I just want to ask who can give me help with the codes to let this
system works.
Thanks.