Introduction: Arduino and Thermocouple K MAX6675
Connecting the thermocouple K MAX6675 to an Arduino Mega.
For this example I used a cheap arduino mega 2560 from SainSmart.
The thermocouple K MAX6675 is a convert that allows temperature reading from 0ºC to 1024ºC. You can learn more about it by read the datasheet here.
Step 1: Material
1 - Arduino
2 - ThermoCouple K MAX6675
3 - USB Cable
Step 2: Wiring the Material
So now we connect the thermocouple to the pin 45 to 53 (in the arduino the pins goes in pairs)
Step 3: Coding Like a Pro...
First of all I need to find a Library who help us to communicate with the sensor. After browsing the web for a couple of hours and testing the libraries, I enjoyed that one, ThermoCoupleK from LadyAda who I believe don't mind if we use it.
After looking at some examples I ended with this code (that is close to the one I found).
Attachments
Step 4: Conclusion
As you can see it's quite easy to create a K-type temperature reader. Now it's up to you to found an application to this instructable.
That's all folks
23 Comments
1 year ago
Muchas gracias.
6 years ago
fixed problem..
both controllers from ebay are faulty,
made my own and works great, thank you for your splendid tutorial..
Reply 2 years ago
can you guide me as i am also facing problem
is there any tutorial to solve thermocouple by building your own
Reply 6 years ago
Happy to ear that.
Thanks for the support and good luck with your development.
3 years ago
Hi! I've been using the thermocouple for a project and it has been working great for the past few days but suddenly started (continuously) giving 32ºF as the room temperature read. Does anyone have any tips on how to troubleshoot and get it back to the accurate temperatures? Thanks!
Reply 3 years ago
My temperature was displaying the same 32 degrees as yours was. I found that if the metal jacket of the sensor wire touched the metal frame of my electronics bench then it would display 32 but otherwise is was accurate to show the room temperature. Did you get your problem solved?
4 years ago
Hi, I would like to use 7 thermocouples and get a reading from each every 200ms, is that something you can do?
4 years ago
hai, can you explain me this part? why used only pin vcc n gnd?
4 years ago
Hi,
I am trying to use a switch case function and while function based on the temperature read of the thermocouple. However, when I try to have the arduino read the temp to test the while statement nothing happens. How can I have the arduino read the temp for the while statement?
4 years ago
hi
can I use max 31855k ?
my probe is pt100
I want to use this project for artisan software (coffee roaster)
please help me
Reply 4 years ago
Hi,
I never tested that one but you can try it. For that you should change the library for this one (https://github.com/adafruit/Adafruit-MAX31855-libr... the one I use is fot the MAX6675.
Good Luck
5 years ago
Hi,dude. Where can I get the coding for 2 points calibration of thermocouple ? Thank you in advance
5 years ago
how if use 5 thermocouple in one arduino it si possible or not ? :)
6 years ago
I'm a supreme noob. Should I have another file that the code is looking for?
I'm getting an error :(
Arduino: 1.6.7 (Mac OS X), Board: "Arduino/Genuino Uno"
/xxx/xxx/Downloads/ThermoCoupleK/ThermoCoupleK.ino:1:21: fatal error: max6675.h: No such file or directory
#include <max6675.h>
^
compilation terminated.
exit status 1
Error compiling.
6 years ago
hi . how can i wire max6675 to ramps ? and what config should i do in repetier firmware ?
6 years ago
does the max6675 IC works with any brand of k-type thermocouple? i am using this one http://www.olimex.cl/en_US/shop/product/termocupl...
but the measurements on the serial terminal are very wrong. The impedance of my thermocouple is less than 2 ohm. Can you explain me please how to use correctly my thermocouple with the IC ?
Reply 6 years ago
Hi,
I'm not really sure how it will work cause the TC-K range is between 0-800ºC and the MAX6675 is between 0-1023.75ºC. You must need to adjust the limits to match the same values.
But as I said, I not sure it will work, if someone can help here it will be great.
6 years ago
the model is MAX6675
pinout is : gnd, vcc, sck, cs, so
6 years ago
hi my pinout is :
DO
CS
CLK
I tied :
SO = DO
CS = CS
SCK = CLK
but no joy, would you know my pinout to yours
Reply 6 years ago
Hey there,
is your thermocouple a MAX6675? Check the annotation on the thermocouple board and let me know your model to try to help you.
greats