DIY Thermocouple Temperature Probe Max6675 - How to make, calibrate, & use. Accurate!

Cheap, Easy, quick solution to make, calibrate, and use a DIY thermocouple using the MAX6675 module. Tips & tricks to ensure you get accurate temperature readings, which are relevant to any thermocouple or temperature probe, are shared. Having an accurate/calibrated thermocouple and knowing how to properly measure surface temperatures is vital to ensuring things are actually at the temp you want them to be at.
0:00 Intro
0:31 How to make thermocouple module
2:08 Wiring diagram
2:12 Thermal paste for accurate temp
4:57 How to calibrate thermocouple
6:14 Code for MAX6675 module and calibrate
9:20 How to measure surface temperatures
11:23 Always calibrate temperature probes
11:52 Please subscribe :)
Parts List:
SainSmart MAX6675 Module + K Type Thermocouple Thermocouple Sensor Temperature 0~1024℃ for Arduino ($14 on 11/24/2022): amzn.to/3WH65BV
IZOKEE 0.96'' I2C IIC 12864 128X64 Pixel OLED LCD Display Shield Board Module 4 Pin for Arduino for Raspberry Pi (Pack of 3pcs, White-IIC) ($12 on 11/24/2022)::
amzn.to/3j7oolX
TRERICE Heat Transfer Paste: 1 oz Size, White Mfr. Model # 107-0001 ($5.11 on 11/24/2022):
www.grainger.com/product/TRER...
*Rated up to 400F. Make sure this works for your application.
Used an Arduino Nano Rev 3, though you can use any Arduino that has the appropriate connections (e.g.
SPI connections docs.arduino.cc/learn/communi...
and
I2C connections docs.arduino.cc/learn/communi...
)
amzn.to/3ZYFiE1
Code:
-github.com/mikef522/CZcamsVi...
-drive.google.com/file/d/1Rpvz...
Circuit Diagram:
-github.com/mikef522/CZcamsVi...
-drive.google.com/file/d/1hqdp...
I have a home lab I use to make microfluidic devices to grow human tissues with blood vessels in the lab. One step involves heating silicon wafers to precise temperatures using hot plates. This thermocouple ensures I know that the hot plates are properly calibrated and providing uniform heat.
It goes without saying that you can put this all in a case to make it nice and tidy! Be sure to ensure that the thermocouple connections are screwed tight in the screw terminals. Soldering connections where possible is recommended to help avoid loose connections causing the display to freeze or disappear.
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Under no circumstances will Mike Ferguson be responsible or liable in any way for any content, including but not limited to, any errors or omissions in the content, or for any loss or damage of any kind incurred as a result of any content communicated in this video and the videos on this channel, whether by Mike Ferguson or a third party. In no event shall Mike Ferguson be liable for any special, indirect or consequential damages or any damages whatsoever resulting from loss of use, data or profits arising out of or in connection with the availability, use or performance of any information communicated in this video and the videos on this channel. Due to factors beyond the control of Mike Ferguson, it cannot guarantee against improper use or unauthorized modifications of this information. Mike Ferguson assumes no liability for property damage or injury incurred as a result of any of the information contained in this video and the videos on this channel and the videos on this channel. Use this information at your own risk. Mike Ferguson recommends safe practices when performing any do it yourself projects and repairs and or with tools seen or implied in this video and the videos on this channel. Due to factors beyond the control of Mike Ferguson, no information contained in this video and the videos on this channel shall create any expressed or implied warranty or guarantee of any particular result. Any injury, damage, or loss that may result from improper use of these tools, equipment, or from the information contained in this video and the videos on this channel is the sole responsibility of the user and not Mike Ferguson.

[@user-ck9fc5yf6o]

keep up the good work

[@ivanadiego6067]

I did the seme procedure, I used this small function to calculate the compensated value accounting for gain and offset using a linear approximation:
PV=Module.readCelsius(); //temperature value read by the MAX6675 module
//function that compensates gain and offset:
//known_T0 and known_T1 are the first and the second known reference temperatures (can be ice bath and boiling temperatures)
//reported_T0 and reported_T1 are the corresponding temperatures reported by the module connected to the arduino at each test
float PV_comp(float known_T0,float reported_T0,float known_T1,float reported_T1)
{
//compensated temperature concidering offset and gain error
PV = (PV-reported_T0)*((known_T1-known_T0)/(reported_T1-reported_T0));
return(PV);
}
//call the function to overwrite the Previous value with the compensated value:
PV = PV_comp( .... , .... , .... , .... ); //

[@23lkjdfjsdlfj]

TIL. Thanks!

[@Guishan_Lingyou]

Evolution sensors and controls makes and sells thermocouples and various connectors and accessories. They are located in Florida, USA, so I don't know how good of a source they are for people outside the US. (If you call them you can talk to actual people that know what they are talking about, btw.) (I'm not associated with them, but I did buy some thermocouples from them.)

[@mikef522]

Made a mistake at some point. Said wires of thermo couple were soldered together. This is not true. They are WELDED together. Also, MISO protocol should be SPI protocol.

[@fireghosts5136]

hello, when I measure cold water it works perfectly whenever I put it in hot water the temperature in my display stuck at -1.75, hope that you can help me with that thanks.

[@mikef522]

Not sure what the problem is. Idk if i've had that exact problem. Sometimes the display would freeze randomly if I moved it the wrong way (like there was a loose connection) or if it was on a really long time. Not sure why though. Restarting it by unplugging it and restoring power fixed the problem.