Thermometer + LCDisplay

Started by Eugene Lai November 20, 2003
i had constructed thermometer (which using PIC16f84) and LCDisplay
(which using PIC16f877). Then how can combine together????



> i had constructed thermometer (which using PIC16f84) and LCDisplay
> (which using PIC16f877). Then how can combine together????

Why use two PICs?

Below: Jal code for displaying the temperature on an LCD (from
http://www.voti.nl/jal/doc/exa.html#e0004).

Wouter van Ooijen

-- -------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products -- a temperature display using
-- an LM75 and a HD44780 LCD controller

include 16c84_10
include jlib
include lm75
include hd447804

const lm75_address = 0

hd44780_clear

forever loop

var byte t, d
var bit f

lm75_read_fdt( lm75_address, f, d, t )

hd44780_line1
if f then
hd44780 = "-"
else
hd44780 = "+"
end if
print_decimal_2( hd44780, d, " " )
hd44780 = "."
print_decimal_1( hd44780, t, "0" )

delay_200mS

end loop


I am in the process of building the same the thing. I saw a project on Rentron using a 16F84. But instead of using the 16F84 I wanted to use the 16F876 or the 877 since I am going to need more ports for other application. Anything I am suppose to beware of?

 I am going to use the PIC Basic. The sensor is a DS1820 from Dallas Semiconductor. LCD is from Hitachi which I am still trying to read "Hello World". The backlight turns on. The contrast on it works. But no "Hello World"?????!!!!

Other inputs are to be used for voltmeter and rpm using OPTEK sensor.If anyone has any projects in Basic that I could use please help me out.

 


----- Original Message -----
From: "Wouter van Ooijen"
Date: Thu, 20 Nov 2003 13:23:10 +0100
To:
Subject: RE: [piclist] Thermometer + LCDisplay

> i had constructed thermometer (which using PIC16f84) and LCDisplay
> (which using PIC16f877). Then how can combine together????

Why use two PICs?

Below: Jal code for displaying the temperature on an LCD (from
http://www.voti.nl/jal/doc/exa.html#e0004).

Wouter van Ooijen

-- -------
Van Ooijen Technische Informatica: www.voti.nl
consultancy, development, PICmicro products-- a temperature display using
-- an LM75 and a HD44780 LCD controller

include 16c84_10
include jlib
include lm75
include hd447804

const lm75_address = 0

hd44780_clear

forever loop

   var byte t, d
   var bit f

   lm75_read_fdt( lm75_address, f, d, t )

   hd44780_line1
   if f then
      hd44780 = "-"
   else
      hd44780 = "+"
   end if
   print_decimal_2( hd44780, d, " " )
   hd44780 = "."
   print_decimal_1( hd44780, t, "0" )

   delay_200mS

end loop


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You might consider Microchip's TB052 -- they use the MSSP module of
an F872 to communicate with multiple temp sensors. Not sure if it's
the range and accuracy you need, but the TB also has good LCD
communication code (in .asm though, not basic). I am just finishing
up a weather monitor based on that TB with humidity and pressure
sensors all being driven by one F872 chip. --- In , "randy ram" <anilram@e...> wrote:
>




it should be very easy to move the temp sensing pieces from the f84
project to the f877 one. since you included zero details on either
project, its impossible to give you any concrete advice. Assuming
you wrote the PIC code, it should be a piece-o-cake.

--- In , "Eugene Lai" <genelewis88@y...> wrote:
> i had constructed thermometer (which using PIC16f84) and LCDisplay
> (which using PIC16f877). Then how can combine together????




That is my major challenge. I am new to the the PIC world and I got all the codes from a website.(Rentron). They had example of this themometer + lcd project on the F84. So, I thought I will do it on a F84 then transfer it to the F876 or F877.

----- Original Message -----
From: "Phil"
Date: Thu, 20 Nov 2003 16:33:25 -0000
To: p...@yahoogroups.com
Subject: [piclist] Re: Thermometer + LCDisplay

it should be very easy to move the temp sensing pieces from the f84
project to the f877 one.  since you included zero details on either
project, its impossible to give you any concrete advice.  Assuming
you wrote the PIC code, it should be a piece-o-cake.

--- In p...@yahoogroups.com, "Eugene Lai" <genelewis88@y...> wrote:
> i had constructed thermometer (which using PIC16f84) and LCDisplay
> (which using PIC16f877). Then how can combine together????


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--- In , "randy ram" <anilram@e...> wrote:
>
If you think that you are going to use the f877 more than the 16f84
hten just beging with the 16f877. The question I think you want to
ask is what is the diference between 16f84 and the 16f877? The 16f877
has more bells and wistles. I think you have two options here. You
could either use the Analog to digital capabilities of te 16f877 or
just use the code and circuit written for the 16f84. Just copy paste
the code for the 16f84 into the 16f877. Then change a few lines here
and there. For example, the port being use, and make all pins on the
16f877 digital. then write the LCD code on a diferent port. SO it
would lok like portA is dedicated to the tempreture reading. And port
B is dedicated to the LCD output. On the other hand if you want to
use the 16f877 analog to digital capabilities then more reading is
required. I haven't got this far yet.

The third option is just to stick with the 16f84. Use what the book
or article told you. PortA for inputs and port B for LCD display. You
have more than enought pins for the job.