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aldoudou
Joined: 17 Oct 2010
Posts: 3
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| send temperature with rf |
 Posted: Thu Oct 28, 2010 9:43 am |
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Hi everyone,
I work in a project witch I take the temperature from a sensor (ds18b20) this sensor connected with a pic(18f4423) and I send it to lcd.
Now I want to send through rf to another pic (18f4423)and agαιn to print the temperature to lcd, my rf modules is er400trs!
transmitter
| Code: |
#include <18f4423.h>
#device *=16
// internal osilator used
#fuses HS, NOWDT, NOPROTECT, PUT
#use delay(clock=2000000)
#define WireTX PIN_C6
#use rs232(baud=9600, xmit=WireTX, BITS=9, ERRORS, STREAM=Wireless)
#include "wire1.c"
#include "flex_lcd2.c"
int8 tH,tL,Conf;
float ds1820_read()
{
int8 busy=0, temp1, temp2;
signed int16 temp3;
float result;
onewire_reset();
onewire_write(0xCC);
onewire_write(0x44);
delay_ms(200);
while (busy == 0)
busy = onewire_read();
onewire_reset();
onewire_write(0xCC);
onewire_write(0xBE);
temp1 = onewire_read();
temp2 = onewire_read();
tH=onewire_read();
tL=onewire_read();
Conf=onewire_read();
temp3 = make16(temp2, temp1);
result = (float) temp3 / 16.0; // 0.1 deg C resolution
delay_ms(200);
return(result);
}
void main()
{
float temperature;
signed int16 temp;
int8 b[2];
int n;
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
//for 10 bit resolution mod
onewire_write(0xCC);
onewire_write(0x4E);
onewire_write(125);
onewire_write(-55);
onewire_write(127);
onewire_reset();
onewire_write(0xCC);
onewire_write(0x48);
delay_ms(15);
lcd_init();
lcd_putc("\f");
while (1)
{
temperature = ds1820_read();
temp = onewire_read();
b[0]=make8(temp,1);
b[1]=make8(temp,0);
for (n=0; n<2; n++)
{
fputc(b[n],wireless);
}
lcd_gotoxy(1,1);
printf(lcd_putc,"TEMP: %3.1f ", temperature);
lcd_putc(223);
lcd_putc("C ");
lcd_gotoxy(1,2);
if(temperature >= 29.0)
printf(lcd_putc,"Hot! ");
else if( temperature >= 20 && temperature < 29.0)
printf(lcd_putc,"Comfort!");
else
printf(lcd_putc,"Cold! ");
}
}
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receiver
| Code: |
#include <18f4423.h>
#device *=16
// internal osilator used
#fuses HS, NOWDT, NOPROTECT, PUT
#use delay(clock=20000000)
#define WireRX PIN_C7
#use rs232(baud=9600, rcv=WireRX, ERRORS, BITS=9, STREAM=Wireless)
#include "flex_lcd2.c"
void main()
{
float temperature;
long temp;
int8 b[2];
int n;
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
lcd_init();
lcd_putc("\f");
while (1)
{
for (n=0; n<2; n++)
{
b[n]=fgetc(wireless);
}
temp=make16 (b[0],b[1]);
temperature = (float) temp / 16.0; // 0.5 deg C resolution
lcd_gotoxy(1,1);
printf(lcd_putc,"TEMP: %3.1f ", temperature);
lcd_putc(223);
lcd_putc("C ");
lcd_gotoxy(1,2);
if(temperature >= 29.0)
printf(lcd_putc,"Hot! ");
else if( temperature >= 20 && temperature < 29.0)
printf(lcd_putc,"Comfort!");
else
printf(lcd_putc,"Cold! ");
}
} |
This code work in first pic(18f4423), I take the temperature in lcd but I can't make the rf connection.
Any ideas someone? |
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newguy
Joined: 24 Jun 2004
Posts: 1907
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Oct 28, 2010 2:27 pm |
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| Quote: | transmitter
#include <18f4423.h>
#device *=16
// internal osilator used
#fuses HS, NOWDT, NOPROTECT, PUT
#use delay(clock=2000000)
#define WireTX PIN_C6
#use rs232(baud=9600, xmit=WireTX, BITS=9, ERRORS, STREAM=Wireless) |
1. #device *=16 is not necessary for 18F. The compiler always uses
16-bit pointers with 18F PICs. Delete that line.
2. Your comment says internal oscillator used, but your fuse is HS, which
is used for external crystal. The comment is incorrect. Delete it.
3. Your #use delay() is set for 2 MHz. Almost certainly, it should be set
for 20 MHz. Edit that line to correct it.
4. Why are using specifying 9 bits for the UART ? |
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aldoudou
Joined: 17 Oct 2010
Posts: 3
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| Posted: Thu Oct 28, 2010 3:34 pm |
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Yes now I have see my fault to crystal, thank you for your suggestion. The crystal which I use is 20 Mhz I forgot a '0'
The BITS=9 I have see some examples with rs 232 because of that I have write this like that:
http://ccsinfo.com/forum/viewtopic.php?t=27889&highlight=inte
My temperature is 2 bytes
| Code: |
temp = onewire_read();
b[0]=make8(temp,1);
b[1]=make8(temp,0);
for (n=0; n<2; n++)
{
fputc(b[n],wireless);
} |
this code line to transmitter is right? |
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ckielstra
Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands
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| Posted: Fri Oct 29, 2010 1:00 am |
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Only 1 out of 10000 projects has a good reason to use 9 bits. Most other examples, like the one you refer to, are made by programmers who don't know what they are doing and think 'more is better'.
1 byte == 1 character == 8 bits
Only when you want to add things like error detection bits (parity for example) it makes sense to add a 9th bit but in all other cases you are making things more complex to yourself. So change to 8 bits.
| Code: | temperature = ds1820_read();
temp = onewire_read();
b[0]=make8(temp,1);
b[1]=make8(temp,0);
for (n=0; n<2; n++)
{
fputc(b[n],wireless);
} |
This code is for reading and transmitting the temperature. But you are using two different functions for reading the temperature. You say the temperature is shown good in the first program, this is using the ds1820_read() function. You should test the second function on the display too. It is very well possible the onewire_read() function is not working correct. |
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aldoudou
Joined: 17 Oct 2010
Posts: 3
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| Posted: Sat Oct 30, 2010 6:48 am |
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IF I make this is better?
| Code: |
temperature = ds1820_read();
temp = (int)temperature;
b[0]=make8(temp,1);
b[1]=make8(temp,0);
for (n=0; n<2; n++)
{
fputc(b[n],wireless);
}
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Or is better to change the temperature to characters? |
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