Temperature monitoring system (first project plz help)

[Mystical Groovy]

Hey all ,

Ok I havent got any knowledge on microcontrollers and general robotics exept the very basic (what are they, and how they work)
but I know good C++ and writing GUI progrs using the Qt API in linux.

and I whant to start a temperature monitoring project..
the idea is that the temperature sensors will be connected to the board via cable, I also whant the sensors to be programmable, so I can create a GUI program to display the temperatures on screen.

the sensors will be far from the board at a distance of over 25meters.

so I whant somethink like this:
AD592 Temperature Probe

basicly I want the sensor to be easy to connect to the board and to program it.
Also im thinking of programming the hole project under a Linux machine.

my pic microcontroller is the PIC16C57C.

Any suggestions about where to start and what to buy?

Thank you for your time and sorry for my english.

[wolfofchina]

I think 1-wire temperature  sensor DS18B20  better, because it can give digital signal , and can meet you distance  requirments .

[debutpic]

what accuracy do you want?

DS18B20 is  more easy to use

[Mystical Groovy]

Hey, thx for the replie's

I want at least 0.5/1 accurasy.

[Mystical Groovy]

Ok guyz, I think Ill buy the DS18B20, do you know if there's an extension cable or somethink this so I will connect the sensor on the cable and then, the cable on the board?

[wolfofchina]

DS18B20 only needs 1-wire, microC has library of 1-wire,proteus has examples about DS18B20. Or you can use the 1-wire driver DS2480.  http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2812

Posted on: June 29, 2008, 02:26:54 02:26 - Automerged
http://datasheets.maxim-ic.com/en/ds/DS2480.pdf

[sherm]

Rentron have an excellent site with plenty of example projects. Have a look at http://www.rentron.com/PicBasic/VB_PIC_TEMP.htm for an idea about where to start to get your project working. While the software for the microcontroller they're talking about is a BASIC language, not C, you should be able to get a feel for how to communicate with the Dallas range of temperature sensors. This project will also give you some ideas about reporting the temperature back to a PC for monitoring/logging.

Good luck!

[Mystical Groovy]

c00l links! thx, Ive just ordered 2 DS18B20

[matelda]

hi friends  :
why u dont design small board with Pic working as AD converter and u send the data to the computer as serial signal RS232 or RS 485 , in this case the system will be  sensor with PIC   then cable   then the PC .... it is just an idea i dont know if it is good or not ?
best regards to all friends .