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Adil Malik made a low cost FFT LCR meter with an STM32 MCU:
The approach I took was a mixed signal one where a capable analog front end would be paired up with a beefy DSP processor to compute the Impedance. Most importantly, in this scheme, the DSP is responsible for discriminating the phase between the sampled voltage and current waveforms; this approach is preferred because it leads to good accuracy and calibration stability.
Low cost high accuracy STM32 FFT LCR meter – [Link]
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