Honors College Thesis
 

Prototyping of Thermoelectric Energy Harvesting Circuitry for IoT Devices

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https://ir.library.oregonstate.edu/concern/honors_college_theses/7h149x576

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  • Due to the advancement of incredibly low power microcontrollers and small form factor integrated circuits, energy harvesting can be considered as an alternative, low power source for remote ocean sensing and measurements. To demonstrate the effectiveness of harvesting thermoelectric energy contained in the temperature differential between ocean surface water and the surrounding air as a form of power, a small Internet of Things sensing device capable of taking temperature measurements and sending them over wireless transmission was designed and implemented using a custom printed circuit board. The device was tested using variable temperature input from hot plate and chilled heat sink, and the time to charge a 15F capacitor from 2.9V to 3V was recorded over several trials. The test results were used to estimate the minimum interval of time between data samples given a specified temperature input. The results of the test indicated that the device was capable of using thermoelectric harvesting to sustain battery life and take data samples in the range of several minutes at a time, however only if given a high enough differential temperature input. Overall, the device functions as a functional prototype. With modifications to the type and shape of thermoelectric generator used in the design, as well as a more robust mechanical design, a redesigned system could serve as a significant contribution to coastal research data collection in the future.
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