MAX6675 K-type Thermocouple

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wiredcharlie
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MAX6675 K-type Thermocouple

#1 Post by wiredcharlie » 20 Aug 2022, 18:02

I see a rather puzzling behaviour here. Initial reading is 21.8 which is plausible room temperature. But then if I warm up the sensor, the value goes down!

What am I missing?

Please help!

Tony
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TD-er
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Re: MAX6675 K-type Thermocouple

#2 Post by TD-er » 20 Aug 2022, 22:13

Hmm my initial thought would be it might be reversed, since a thermocouple does generate a (very small) voltage depending on the temperature.

Do you have the correct type thermocouple selected?
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wiredcharlie
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Re: MAX6675 K-type Thermocouple

#3 Post by wiredcharlie » 22 Aug 2022, 09:20

Spot on!

Thank you
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TD-er
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Re: MAX6675 K-type Thermocouple

#4 Post by TD-er » 22 Aug 2022, 16:54

Which of the 2 was it?
Reversed polarity or wrong type?
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wiredcharlie
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Re: MAX6675 K-type Thermocouple

#5 Post by wiredcharlie » 12 Sep 2022, 11:15

Polarity
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