I am working on a project, where I am using thermocouple amplifier Max6675 with my K type sensor.
I bought my Max6676 from alibaba, so I am using a cheap and maybe not so accurate item. The heatsensor is produced by Omron, so it is maybe the best sensor by my level,it has to be good.
I am using an arduino nano(at this moment) for interpreting the data from Max6675 and I am experiencing variable temperature values, but the condition around the sensor and amplifier did not changed.
For example: I measure from 21 to 24 degree Celsius in my room, and I know that K type sensors have just 2-3 degree accurate, but between unchanged environment it is not acceptable for me. The measured values has to be the same, when the circumstances did not changed. Or am I wrong?
I measure the heat in every second, after I make an average from the 60 sec info, and experience this jumping (between 21-24 degree) in the average value. I think something is not accurate enough.
The project what I am developing will manage a cooking system, that is why I am not able to accept this jump between unchanged conditions.
Maybe I have to buy a more expensive amplifier. Could somebody recommend my an other type amplifier, what could be more accurate?
I am thinking about adafruit MAX31855 breakout board because of the manufacturer, but maybe somebody have experience in this topic and could recommend me something else, or can encourage my to buy an adafruit.
many thanks in advanced