K Type Thermocouple and MAX6675?

Hi,

I am looking at using a K Type Thermocouple with my Arduino. Does any one see a problem with using this K Type Thermocouple:

http://www.jaycar.com.au/productView.asp?ID=QM1282&CATID=&keywords=temperature&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID=

with the MAX6675

Is there any code for interfacing with these? Or is there a better option for using this sort of Thermocouple with the Arduino?

Any comments appreciated.

Thanks,
Paul

Yes it looks a good choice. The built in 12 bit A/D converter needs to be read using SPI which is basically clock (suppled by toggling an Arduino output) and data (reading one bit at a time on an input pin). It's cold junction compensated and has 0.25 degree C resolution.

Thanks for the reply, my intension is to log the data from the thermocouple, i'm just getting my head around the whole thing at the moment.

Thanks,
Paul

The MAX6675 is very easy to use, I've had good results with it. It's worth the high price...almost. Especially if it's not your own money you're spending.

@macegr: Could you please post some code for interfacing the MAX6675 with the arduino? I'm new to electronics and programming and I haven't had success getting it to work. I really need it all spelled out like I'm a four year old.

Hi,

Would there be any benefit or would it be easier to use the AD595?

Thanks,
Paul

The AD595 chip does not do the A/D conversion. It's accuracy sucks compared to the other one. Neither chip will do the full range of a type K so don't be smelting metal or working with glass. :wink:

Hi,

Would there be any benefit or would it be easier to use the AD595?

Thanks,
Paul