Design and Implementation of an Ultra-Low-Cost Impedance Analyzer

A novel impedance analyzer working in the range of 500 Hz to 500 kHz is proposed in this paper. Based on the proposed Wave Adder circuit, Peak Detector circuit, and Multilayer Perceptron algorithm, the designed analyzer can measure the impedance value of an object without any high-speed ADCs (Analog-to-digital Converters) or proprietary impedance measuring chips. Besides, the proposed hardware can achieve extremely low production costs (less than ¥35) while still obtaining reliable impedance analyzer functionality. In order to validate the proposed analyzer, a demonstration system was presented in this paper, with an upper machine (Android APP) and a lower machine (ESP32 Based analyzer). The experimental results demonstrated that the proposed analyzer could reach a 5% measurement error in the frequency range of 500 Hz to 500 kHz, which might be a promising solution for designs of low-cost impedance analyzers.