Design and Instrumentation of an Arduino-Based Temperature Measurement and Control Device by K-type Thermocouples

Yıl 2025, Cilt: 21 Sayı: 4, 160 - 171, 29.12.2025

Coşkun Deniz , Burak Buran

https://doi.org/10.18466/cbayarfbe.1694157

Öz

This study focuses on designing an Arduino-based temperature measurement and control device operating with K-type thermocouples. Cold junction compensation (CJC) is essential in temperature measurement by thermocouples. In our work, two user-selectable circuits were designed to measure and control the contact temperature, namely, the first one using the conventional MAX6675 module and the second one using the INA114AP instrumentation amplifier. The MAX6675 part in our design involves the MAX6675 module, which is a conventional “thermocouple to digital converter” where CJC is achieved internally by fabrication. On the other hand, the INA114AP part in our design involves external CJC through our Arduino codes. Our experimental setup to determine the accuracy of temperature measurements involves the Keithley-2182A Nanovoltmeter and a heated-cooled water bath. The accuracy of our setup was initially determined statistically by comparing the results of temperature-voltage measurements in our setup by the K and E-type thermocouples by using their table values. Performance and accuracy of our design have been determined statistically by comparing the measurement results of our two modules with the results of the direct measurements by Keithley-2182A, which was taken as the most accurate measurement through the tables of K-type thermocouples within our initially determined setup accuracy. The accuracy results of our measurements show that the INA114AP part in our design surpasses various conventional instruments, such as the RuoShui 97 Digital Multimeter, Fluke 17B+ Digital Multimeter and even the fabricated MAX6675 module between 0°C and 100°C. Finally, we present how to use our Arduino-based two modules (where INA114-part being the most accurate) for controlling load (i.e., running in 230V-AC) as a high precision temperature control device between 0°C and 100°C.

Anahtar Kelimeler

Arduino based temperature measurement and control , cold junction compensation , control by temperature , INA114 instrumentation amplifier , MAX6675 module , temperature measurement , thermocouple

Kaynakça

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