20.500.12556/RUL-186522 Zaznavanje rastlinskih električnih signalov za pomanjkanje vode Detection of Plant’s Electrical Signals for Water Deficiency Diplomsko delo obravnava možnost zaznavanja električnih sprememb na rastlini kot možnega pokazatelja njenega stanja ob pomanjkanju vode. Prvotna zasnova naloge je temeljila na spremljanju rastlinskih električnih signalov pri postopnem sušenju substrata. Med izvedbo je bil eksperimentalni del usmerjen v preverjanje merilne verige, primerjavo elektrodnih izvedb in opazovanje izbranih odzivov rastline na zunanje dražljaje. Kot poskusna rastlina je bil uporabljen paradižnik, sorta Novosadski jabučar (Solanum lycopersicum). Merilna veriga je bila izvedena z modulom AD8232, mikrokrmilnikom Arduino Nano in programsko obdelavo v jeziku Python. Preverjanje merilne verige je bilo izvedeno s funkcijskim generatorjem Agilent 33220A in uporovnima delilnikoma, s katerima sta bila pripravljena testna signala različnih amplitud. Na podlagi teh meritev je bila določena približna pretvorba med amplitudno enoto zapisa in vhodno napetostjo, približno 4,52 µV/enoto. V eksperimentalnem delu so bile primerjane tri izvedbe elektrod: vbodne srebrne elektrode, ovite srebrne elektrode in vzmetne zlate kontaktne elektrode. Pri vseh rastlinskih meritvah je bil za prikaz uporabljen enoten digitalni nizkoprepustni filter četrtega reda z mejno frekvenco 30 Hz. Rezultati kažejo, da je z uporabljeno merilno verigo mogoče zaznati merljive spremembe signala ob nekaterih dražljajih, vendar hkrati pokažejo izrazito občutljivost na elektrodni stik, izvedbo elektrod in stanje rastline. Ovitim elektrodam se je pri močnem sušenju rastline poslabšal mehanski stik, medtem ko sta vbodna in vzmetna kontaktna izvedba stik ohranjali stabilneje. Naloga ne dokazuje enolične povezave med pomanjkanjem vode in značilnim električnim signalom rastline. Predstavlja pa merilni pristop, praktične omejitve in primerjavo elektrodnih izvedb, ki so potrebni za nadaljnje zanesljivejše meritve rastlinskih električnih signalov. This thesis investigates the possibility of detecting electrical changes in plants as an indicator of plant state during water deficiency. The original plan focused on monitoring plant electrical signals during gradual drying of the substrate. During the work, the experimental part was redirected toward verification of the measurement chain, comparison of electrode designs and observation of selected responses to external stimuli. The experimental plant was tomato, cultivar Novosadski jabucar, Solanum lycopersicum ‘Novosadski jabucar’. The measurement chain was based on an AD8232 module, an Arduino Nano microcontroller and Python-based data acquisition and processing. The measurement chain was verified with an Agilent 33220A function/arbitrary waveform generator and two resistive dividers. The tests provided two input signals of different amplitudes and enabled an approximate conversion of the recorded amplitude units to input voltage, about 4.52 µV per unit. Three electrode designs were compared: inserted silver electrodes, wrapped silver electrodes and spring-loaded gold contact electrodes. For plant measurements, a unified fourth-order low-pass digital filter with a 30 Hz cutoff frequency was used. The results show that measurable changes can be observed with the implemented setup, but also that the measurements are strongly affected by electrode contact, electrode design and plant condition. Wrapped electrodes lost contact during severe plant wilting, while inserted and spring-loaded contact electrodes maintained contact more reliably. The thesis does not prove a unique relationship between water deficiency and a specific plant electrical signal. It presents a measurement approach, practical limitations and an electrode comparison that can support further controlled measurements of plant electrical signals. rastlinski električni signali biopotenciali paradižnik Solanum lycopersicum vodni stres AD8232 Arduino elektrode filtriranje signalov plant electrical signals biopotentials tomato Solanum lycopersicum water stress AD8232 Arduino electrodes signal filtering true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2026-09-02 15:20:54 2026-09-02 15:21:04 2026-09-09 13:54:49 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 62914 290527491 Zidar_Sebastjan_-_Zaznavanje_rastlinskih_elektricnih_signalov_za_pomanjkanje_vode.pdf Zidar_Sebastjan_-_Zaznavanje_rastlinskih_elektricnih_signalov_za_pomanjkanje_vode.pdf 1 5D0B361C8751667B98D8C3BA20FBB2B7 eeca46a7406f5944e895c4463e8696de9333c27843c465da1d6abab397715484 b92801a0-a6d0-11f1-9b0d-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=245794 Fakulteta za elektrotehniko 0 0 0