Hi so I have a thermocouple connected to a male flat pin connector. Type K Thermocouple Probe Fine .020" Diameter with Miniature Connector | Evolution Sensors and Controls
I also have the MAX6674 module. My question is what do I need to connect these two? There is a female connector I can order but even with that I'm not sure how to connect the female connector to the ardiuno module. Any help??
** Edit in case people cared about the specific part I meant to say MAX6675 module and not 6674**
I don't understand your problem. The both - connector and module - has a wire screw terminals. So all what you need - two or three wires of the suitable length.
You will also need some K-type thermocouple extension wire to link the thermocouple to the module.
Not with a thermocouple, you need the thermocouple extension wire. If you use copper wire you end up with at least two more thermocouples of unknown effect on the measurement.
Ok, perhaps you are right.
But the site say nothing about it....
What site? I wouldn’t expect the site that lists the thermocouple to tell you how to use a thermocouple. Some knowledge needs to come from other sources. Omega used to give away a stack of catalogs. One of the most popular books was the temperature measurement book. In the back of that book was a very good explanation of how to use various temperature sensors. Maybe they have something similar online.
Notice the GROUNDED stainless steel sheath? It is designed to be fastened firmly to some metal object that you are measuring the temperature of. If this is NOT your intention, then this is not for your project.
To connect the thermocouple with the male flat pin connector to the MAX6674 module and your Arduino, you'll need a few components:
Now, let's proceed with the steps:
Once you have completed these steps, your Arduino should be able to communicate with the MAX6674 module, which, in turn, will read temperature values from the thermocouple. With the appropriate code, you can then use these temperature readings in your Arduino projects or display them on a screen, log them to an SD card, or send them to a computer for further analysis. Always double-check your connections and consult datasheets or documentation for your specific components to ensure a proper and safe setup.
Would it be possible to just drill a hole into the male flat pin so that that it can be fastened onto the MAX6675 with the screw?
For step 2, rather than using jumper wires, would it break the connection if I were to drill straight into the flat pin so that it can be screwed onto the MAX6675? The issue with the module is that it doesn't use pins for connection. to the thermocouple. https://www.aliexpress.us/item/3256805207088268.html?_t=pvid%3A0206ac85-b2ca-434e-a82c-e3e4500ce5f4&afTraceInfo=1005005393403020__pc__pcBridgePPC__xxxxxx__1689890478&spm=a2g0o.ppclist.product.mainProduct&gatewayAdapt=glo2usa
Here is the MAX6675 for visual reference.
It is specifically designed for thermocouple extension wires.
Regardless of what a site does not mention you need Type K Thermocouple Extension wire between your TC and your Max 6675 TC module. This is what bitherder_57 is getting at. We won't get into CJC (Cold Junction Compensation) which your MAX 6675 takes care of but between your TC and your MAX 6675 you need TC Extension wire Type K.
The common connectors come in a few sizes, you want a Type K Miniature Female connector which are commonly available. A simple Google should find you some locally to wherever you are. Remember Type K thermocouple extension wire and a miniature type K female connector. Also with Type K the red wire is the Neg and the yellow wire is POS.
Matter of fact the place you bought the TC from sells what you want.
They should also have the Type K TC Extension wire you need. They do!
Ron
Here make it like the below images. Use the screw terminals on the connectors and use Type K extension wire as in the pictures noting the correct polarity.
I would not use solder anywhere, just use the screw terminals as that is why they are there. I also assume the TC you chose will do whatever you plan to do.
The connector pictured is not a miniature connector but a standard Type K (yellow) TC connector. Note the color code of the wire as mentioned previously.
Yes if you can get the flat pins under the metal tabs you can screw them down on the pins or if you want to drill holes for the metal pins have at it. That should work eliminating the extension wire.
Ron
If you are using the Adafruit module take a look at the big red warning on this page
Looks like your grounded T/C. is not allowed. This seems like it would only be a problem if any other part of your circuit is connected to the same ground, but I can’t recommend trying it.
That is a very good point, I thought about it and just dropped the thought.
If you are in the US and need a Type K thermocouple ungrounded with connector I'll send you one with a connector on me. Much like what you have but ungrounded and with an Inconel sheath and actually a dual TC because I have some laying around. with connectors and several feet of extension wire. The ones I have laying around are dual ungrounded Type K. Just means two ungrounded thermocouple junctions in a single package (sheath).
That much less for the kids to dispose of when I checkout of life. 
Ron
You will need to connect your flat terminals to the screw terminals on the board using type K thermocouple wire.
I suggest you purchase a mate to your sensor and some length of thermocouple wire.
Do you live in the USA?
Do you think this warning is for all MAX6675 modules or just the ones from Adafruit?
Yes I do
So far I've been able to just sort of shove the flat pin between the screw and the plate and just screw it down tighter but obviously that is not very secure, so I'll check this out. This project is part of a research lab in school so I kind of need to make a good argument before being able to buy anything additional.
Thanks for the offer to send the dual TCs but the kind I need needs to have a very small diameter.
That's true for all Max6675 modules and probably any thermocouple amplifier module.
You just have to be sure that the thermocouple sheath doesn't come in contact with any metal object that may be grounded or are in any way electrically connected to any other device, power supply, etc.
