DIY simple Arduino automatic quantity capacitance table

Simple Digital Multimeter (DMM) Unable to measure capacitance, to find capacitance, you either need to purchase advanced expensive DMM, or you need to use a dedicated capacitive module. In this project, I will build a simple Arduino capacitance table with automatic quotation functions. It can measure the capacitance of 10 pf to 10,000 μF. The measurement is carried out in automatic mode, and it is sufficient to connect the capacitor to the measurement contact. The device has two scope: "nf" and "μF". When the capacitor is measured, the "NF" range is first opened. If the capacitance is too large, the transition to the "μF" range occurs. Be Each capacitance table has an RC circuit with a known resistance value and an unknown capacitor value. Arduino will measure the voltage on the capacitor and record the time (time constant) required to reach a certain percentage voltage after charge. Since the resistance value is known, we can use the formula in a program that calculates an unknown capacitor. Use a resistor to charge the electrolyte capacitor. Arduino starts the charging of the capacitor based on the capacity of the resistor. In the capacitance table, zero calibration is performed each time it is open, and therefore, when open, the capacitor should not be connected to the measurement contact. Similarly, all capacitors must be pre-discharged. The accuracy is +/- a few percentage points, and depending on the tolerance of the resistor used and the stability of the power supply voltage. Finally, all the entire equipment is placed in the right box, which is another useful tool in your laboratory.

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