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The problem is, the supplied souce must be in AC form in order to make capacitor circuit work, but the output of LM324 presented in AC form too. This make me cant connect the output directly to the input of PIC16F877A. I hav tried to add full wave rectifier, but the output eventually remain unchanged ( eventhough i keep varying the capacitance of the probe).
The problem is, the supply voltage must be in AC form in order to make capacitor work, but the ouput is then in AC form too. This make me cant connect the output of LM324 directly to the input of PIC16F877A, I hav tried to add full wave rectifier, but the output eventually remain unchanged (even though i keep varying the capacitance of the probe). Any suggestion for me?
This circuit is function like a transducer which the input capacitance increase as water level increase, the output voltage will follow to increase. PLease help me.