Simple R, L, C meter is to enable people to compare the convenience of the realization of resistance, capacitor, and inductive measurement, is in line with people's fast-paced life of the measurement instrument, simple measuring instrument has many advantages such as relatively simple operation. To design a simple measuring instrument, we need to learn not only simple simulation electrons and related microcontroller knowledge, but also learn c language programming applications, to be artificially designed. The design of the simple measuring instrument is varied, often the design principle is to use frequency measurement to indirectly find out the corresponding resistance capacitor inductor size, often used RC oscillation circuit and LC capacitive three-point oscillation circuit. In order to be able to find the required frequency f, the measured frequency f can be obtained by the single-chip counting function, and then the parameter value of the resistor capacitor inductor can be easily calculated by using the known frequency f, and the data is sent to display after processing.<br><br>Keywords: frequency, simple measuring instrument, capacitive three-point oscillation circuit
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