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[SOLVED] PIC18f45k22 mikroC t type thermocoupler

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Karolina_1

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Hello

I was trying to build temperature sensor with T type thermocoupler (it has two pins only) using pic18f45k22. I am using mikroC pro compiler. Can anyone help. Please
 

Thermocouple voltage can't be processed by PIC directly. Need a DC amplifier with gain of 200 to 250 to fit the 5 V ADC range, also a temperature sensor for cold junction compensation.
 
I am new to PIC and i would appreciate if you could give me more details, please. Maybe schematics etc
 

I did that. Used x100 analog amplifier based on cheapest LM358. But the mathematic was a bit complex. Calibration needed with linear aqualization. Cold junction was fake - used 20 degrees (indoor use only).
 

Hi,

I am new to PIC and i would appreciate if you could give me more details, please. Maybe schematics etc
Click to expand...
Signal conditioning circuits for thermocouples is a frequently discussed topic here.

A simple forum search should give more than enough information.

And an internet search gives even more informations.

Semiconductor manufacturers make various ICs.
* simple amplifiers
* simple cold jucntion voltage generators
* amplifiers with cold junction compensation
* complete circuits including ADCs
...
and usually they have "application notes" regarding this topic.

Klaus
 

or maybe PT100. I found that its better to use PT100 instead. If someone did it before can they share information
 

Hi,

I agree with Karolina_1. An RTD would be the best option.
Click to expand...

It depends on the temperature range.

Each of them has it´s pros and cons.

Klaus
 
I was able to do it with the help provided above. simply putting ref resistor and taking analog input from middle.
 

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