Testing an air variable capacitor with a simple arduino capacitance meter

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Quickly check the capacitance range of an air variable capacitor with minimal setings/tools

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hi, I connected i2c lcd to i2c pins on the uno (A4 (sda) and A5 (clock)) and connected the test capacitor with a small wire to A0 and A2 and loaded the firmware(hex file by cmd command), and nothing happens on lcd. But in serial window (by hercules) I can measure te capacitor

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