Low-cost standalone multi-sensor thermometer for long time measurements

We present a portable device for long-time recording of the temperature at multiple measuring points. Thermocouple wires are utilized as the sensors attached to the objects. To minimize the production cost, the measured voltage signals are relayed via a multiplexer to a set of amplifiers and finally...

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Bibliographic Details
Published in:Journal of physics. Conference series 2017-09, Vol.901 (1), p.12063
Main Authors: Kumchaiseemak, Nakorn, Hormwantha, Tongchai, Wungmool, Piyachat, Suwanatus, Suchat, Kanjai, Supaporn, Lertkitthaworn, Thitima, Jutamanee, Kanapol, Luengviriya, Chaiya
Format: Article
Language:English
Subjects:
Circuits
Citrus fruits
Electrical measurement
Mandarins
Microcontrollers
Object recognition
Physics
Portable equipment
Production costs
Rechargeable batteries
Thermocouples
Time measurement
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Summary:We present a portable device for long-time recording of the temperature at multiple measuring points. Thermocouple wires are utilized as the sensors attached to the objects. To minimize the production cost, the measured voltage signals are relayed via a multiplexer to a set of amplifiers and finally to a single microcontroller. The observed temperature and the corresponding date and time, obtained from a real-time clock circuit, are recorded in a memory card for further analysis. The device is powered by a rechargeable battery and placed in a rainproof container, thus it can operate under outdoor conditions. A demonstration of the device usage in a mandarin orange cultivation field of the Royal project, located in the northern Thailand, is illustrated.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/901/1/012063