A capacitance measurement circuit constitute multivibrator circuit based the AT89C51 microcontroller 555 chip design, this measurement method to measure the size of the capacitor through a 555 chip. 555 chip work under the direct feedback astable state, the relationship between the 555 chip output of a certain frequency, square wave, the frequency of the size of the measured capacitance is: f = 0.772/(R* Cx), fixed R the size, the formula can be written as: F = k/Cx, as long as it can measure the frequency of the 555 chip output, can be calculated a measured capacitance. Ways to calculate the frequency used in conjunction with use of single-chip counter the T0 and interrupt INT0 to be measured.

51 cap.docx

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