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LM35 temp sensor reading (10°C off)
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Kenny



Joined: 07 Sep 2003
Posts: 173
Location: Australia

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PostPosted: Mon Mar 02, 2009 10:13 pm     Reply with quote
The LM34 can go down to about 5F (-15C) without using a negative supply.
The sensitivity is 18mV/degree C (10mV/degree F by 9/5).
Mamat



Joined: 20 Jan 2011
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Re: LM35 temp sensor reading (10°C off)
PostPosted: Wed Feb 16, 2011 10:11 am     Reply with quote
STIX wrote:
Hi:

I connected a LM35 temperature sensor to my PIC16F877A MCU to take temperature readings. The following is my code:

Code:

#include <16F877A.h>
#device *=16
#device ADC=10
#include <math.h>
#include <stdio.h>
#include <stdlib.h>

#fuses HS,NOWDT,NOPUT,NOPROTECT,NODEBUG,BROWNOUT,NOLVP,NOCPD,NOWRT

#USE DELAY(clock = 4000000)
#use RS232(baud = 9600, xmit = PIN_C6, rcv = PIN_C7)

void main ()
{
   int16 value, value1;
   setup_adc (ADC_CLOCK_DIV_8);
   setup_adc_ports (AN0);
   set_adc_channel (0);
   while (1)
   {
      delay_ms (500);
      value = read_adc ();
      value1 = 5 * value * 100/1024;
      printf ("Temp:%5.1fC\n\r", (float)value1);
   }
}


How the code if I have two lm34 to use 2 analog input ?
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Feb 16, 2011 1:40 pm     Reply with quote
These threads have examples of how to read two A/D channels on the PIC:
http://www.ccsinfo.com/forum/viewtopic.php?t=25969
http://www.ccsinfo.com/forum/viewtopic.php?t=42007
temtronic



Joined: 01 Jul 2010
Posts: 9236
Location: Greensville,Ontario

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PostPosted: Wed Feb 16, 2011 2:01 pm     Reply with quote
Also add 'errors' to the options in USE RS232(....) !
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