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Posted by Charles Beener on December 22, 2004, 6:01 pm
 
   I'll would use the 16F877A Pic I'll need a lot of program space and
I/O lines. LCD display and a 4 by 4 keyboard to allow you to set the
different temperatures for turning of the fan and opening the door. I'll
be using the SHT11 temperature/humidity sensor. I only need one of them
inside and I'll use DS18B20 temperature for the outside readings.
      I've only  done a RS232 interface that send the data to a PC . On
this project we need to send sent points to the PIC also. It will have
a data logger in the VB6 app also. The way my schedule is right now I
will not be able to get it done until the end of January or a little
after. I have to make a PC board for it by hand. No problem ! I have
that process down .
   Here is the parts brake down so far
   16F877A       $
   STH11        $6
   DS18B20     $
   MAX-232 IC     $
   resistors etc     $5
   connectors     $2
   12volt supply     $5

    LCD module    $5
   Dip reed     $
   DTDP relay 12 volt    $2
   or solid state same price 5 amp.

   PC board materisal    $4
                     -----------------------
           APX.      $07
   MY time in hours = 80  value ?
   If you need it in a box  10 more hours.
    
   all the cables can be telephone wire. That will help keep the cost down.


   If you want I could send you a picture of another PCBoard I made or
you can look at my web page and to see if my board are good enough for
you.  at http://home.columbus.rr.com/cbeener/page3.html

nicksanspam@ece.villanova.edu wrote:




Posted by Morris Dovey on December 22, 2004, 9:13 pm
 
Charles Beener wrote:


Hmm. Methinks you're a slow worker (or need to get hold of some
PCB layout software ASAP)

Would you care to do a quantity pricing? I'm interested, too; and
if it looks good to me I'll want more than one...

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/solar.html

Posted by Charles Beener on December 23, 2004, 2:41 pm
      No I'm not slow I just have other project to work on also, I work
40 to 48 hours a week at my main job. If you looked at my web page you
would see that I do all my PCB by hand. All the traces are drawn with a
paint pin. I do have PCB software But I figured that this was a one of a
kind project. Its been years since I've done a project that required a
commercial PCB. and in low numbers it makes the very pricey.



Morris Dovey wrote:


Posted by Anthony Matonak on December 23, 2004, 6:02 pm
 nicksanspam@ece.villanova.edu wrote:

Perhaps you guys are looking at it from the wrong direction.
Certainly these kind of controls requirements can't be unique.
Perhaps there is already an off the shelf product that does
exactly this kind of thing and is available at an affordable
cost.

Alternatively, why not use any of the various small computers
that have been produced in the last 20 years. Many of the oldest
ones were designed to operate tape players and therefore have a
low voltage relay built in as well as various other inputs.
Since they are old, slow and obsolete, these are often available
at very low costs. As a computer, they can be programed to do
any sequence you would like.

For instance the old TRS-80 Model 100 had a clock (of sorts),
parallel, serial and cassette interfaces as well as an LCD
screen and keyboard. They're often found for less than $0.

Another possible (and more modern) would be to use any of the
myriad of PDA's out there. Most of them have some kind of serial
interface and software developers kit.

A quick search found me this (expensive) interface for the 1-wire
and Palm Pilots.
http://embeddeddatasystems.com/Merchant2/merchant.mvc?store_codeS&screen=PROD&product_code=HA7MP

Anthony

Posted by Charles Beener on December 23, 2004, 9:01 pm
       Yes they could do that there are many 1-wire chips out there you
can used . Read temperatures at different locations and they have
Ibuttons and switches that are one wire also here is a list of the devices.

  Group
   code   Part no.     what the device can do.

     01, DS1990A, Serial number iButton
     01, DS2401, Silicon Serial Number
     02, DS1991, MultiKey iButton
     04, DS1992, 1Ki Bit Memory iButton
     05, DS2405, Addressable Switch
     06, DS1993, 4Ki Bit Memory iButton
     08, DS1994, 4Ki Bit Memory/Clock iButton
     09, DS1422, 1Ki Bit Add-Only UniqueWare Button
     09, DS1982, 1Ki Bit Add-Only EPROM iButton
     09, DS2502, 1Ki Bit Add-Only Memory
     0A, DS1995, 16Ki Bit Memory iButton
     0B, DS1985, 16Ki Bit Add-Only EPROM iButton
     0B, DS2505, 16Ki Bit Add-Only Memory
     0C, DS1996, 64Ki Bit Memory iButton
     0F, DS1986, 64Ki Bit Add-Only EPROM iButton
     0F, DS2506, 64Ki Bit Add-Only Memory
     10, DS1820, One-Wire Digital Thermometer
     10, DS1920, Temperature iButton
     12, DS2406, Dual Addressable Switch plus 1Ki Bit memory
     12, DS2407, Dual Addressable Switch plus 1Ki Bit Memory
     14, DS1971, 256-Bit EEPROM iButton
     14, DS2430A, 256-Bit 1-Wire EEPROM
     16, DS19540??, Java??
     18, DS1963S, SHA iButton
     1A, DS1963L, 4Ki Bit Monetary iButton
     1B, DS2436, Battery ID/Monitor Chip
     1C, DS2422, 1Ki Bit 1-Wire RAM with Counters
     1D, DS2423, 4Ki Bit 1-Wire RAM with Counters
     1E, DS2437, Smart Battery Monitor
     1F, DS2409, MicroLAN Coupler
     20, DS2450, 1-wire quad A/D converter
     21, DS1921, Thermocron (temp recorder) iButton
     22, DS1822, Econo 1-wire digital thermometer
     23, DS1973, 4Ki Bit mem
     23, DS2433, 4Ki Bit EEPROM
     81, DS1420, Serial ID Button
     82, DS1425, Multi iButton
     84, DS1427, Time iButton
     89, DS1982U, 1Ki Bit Add
     89, DS2502-E64, IEEE EUI-64 Node Address Chip
     89, DS2502UNW, 1Ki Bit Add-Only
     8B, DS1985U, 16Ki Bit Add
     8B, DS2505UNW, 16Ki Bit Add-Only
     8F, DS1986U, 64Ki Bit Add
     8F, DS2506UNW, 64Ki Bit Add-Only
     96??, DS19550??, Java??
     ??, DS1962, 1Ki Bit Monetary iButton
     ??, DS1963, 4Ki Bit Monetary iButton
     NA, DS1821, Programmable digital thermostat
     NA, DS2434, Battery Identification Chip
     NA, DS2435, Battery ID Chip with Time/Temperature Histogram
     NA, DS2480, Serial 1-Wire Line Driver

  That device   HA7MP - Palm 1-Wire Host Adapter looks
  like it do all.

              Thanks for the web page.



Anthony Matonak wrote:

http://embeddeddatasystems.com/Merchant2/merchant.mvc?store_codeS&screen=PROD&product_code=HA7MP  


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