Hi.
It’s probably something wrong with your code, but it’s hard to tell.
If you’re with issues because of creating multiple SPI instances, you can take a look at our SPI guide: https://randomnerdtutorials.com/esp32-spi-communication-arduino/
Regards,
Sara

a few days ago I tried both of them but, only one is active, the pin configuration is also the same but different in pin cs only.
and now I try again even both the reading results are 20 and 10.
I have checked before the max module, and the sensor works safely.
very very unclear, is there an indication of a software bug?

Hi.
Yes, you can.
Regards,
Sara

Hi.
I’m not sure. I’m our case, we didn’t need to do that. Probably because the resistord already come with our module.
If you’re creating one from scratch you probably need those, but I’m not really familiar with that subject.
Regards,
Sara

Hi.
You’ll need to create multiple instances for the sensors. For example:
MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);
MAX6675 thermocouple_2(thermoCLK_2, thermoCS_2, thermoDO_2), in which the arguments are other pins for that sensor.
etc…
Then, you just need to refer to each sensor by thermocouple, thermocouple_2 and so on.

Regards,
Sara

I tried to assign CS to pin 5, used the pin labeled SCK (pin 10) for CLK and then used the one labeled MOSI (pin 7) for the DO (assuming it is out from the 6675 and in on the ESP). No errors – it compiled and uploaded, but nothing at all on the serial monitor. Maybe a bad 6675 (cheap ebay one). I bought a Qwiic thermocouple interface on SparkFun (MCP9600 based) and plan to try that on the board’s Qwiic interface – they have an example using another sensor on the Git. Thanks for your fast response.

Hi.
What pins are you using?
I think you can use any pins as long as you define them on the following line:

MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);

What is exactly the error that you get?
Regards,
Sara