Projects › Projects › capacitive liquid level measurement using LM324 › The problem is, the supply
April 5, 2012 at 5:24 am #7392
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?