本文提出一個線性掃描伏安法檢測咖啡因感測器之電化學分析儀設計，作為電化學感測器之信號處理 其主要目的是設計一個簡易使用之電化學分析儀，透過塗滴在網版印刷電極之檢測區，將長時間的化學反應過程，以短時間內對待測物進行電壓掃描替代，並觀察結果，實現電化學量測法中常用的線性掃描伏安法。在實驗中採用EFM32微處理器作為控制核心，輸出固定的掃描訊號掃描待測物，觀測電壓電流圖進行高精度與大範圍之分析。透過電流傳導的情況，可使用labview檢測並觀看各項數據之結果。在系統驗證方面，採用了網版印刷電極，針對不同咖啡因濃度之標準液體進行測量，將所得之結果，建立出咖啡因濃度之校正曲線，並將結果與商用電化學分析儀所得出的校正曲線進行比較。本論文提出之咖啡因感測器設計，若用於茶飲或咖啡之檢測，可以快速得知咖啡因濃度，來避免使用者攝入過多咖啡因。

In this paper, we propose a potentiostat for detecting caffeine using linear sweep voltammetry. The main purpose is to design a user-friendly electrochemical analyzer that substitutes the lengthy chemical reaction process with a short voltage scan of the analyte, achieved by drop-coating onto the detection area of a screen-printed electrode. By observing the results, it realizes the commonly used linear sweep voltammetry in electrochemical measurement methods. In the experiments, an EFM32 microcontroller is employed as the control core to output a fixed scanning signal to scan the analyte, and voltage-current curves are observed for high-precision and wide-range analysis. Through the conduction of electric current, LabVIEW can be used to control and visualize the various data results. In terms of system verification, screen-printed electrodes acted as caffeine sensors are utilized to measure standard liquid samples with different caffeine concentrations. The obtained results are used to establish a calibration curve for caffeine concentration, which is then compared with the calibration curve obtained from a commercial electrochemical analyzer. The caffeine sensor proposed in this paper, if applied to the detection of tea or coffee, can rapidly determine the caffeine concentration to prevent users from consuming excessive amounts of caffeine.