Abstract
This paper presents the development of a capacitor ESR meter, which covers capacitance and ESR measurements as well as the interrelationship of the constituent parts/circuits. The idea is to keep the hardware design simple, transferring the complexity to firmware which controls the hardware. In particular, it uses automatic functions controlled by relays thus there is no need for switches and its automatic calibration ensures there is no need for menus. This work covers voltmeter function, C/R time constant function and ESR function using Arduino Uno boards. Each firmware code was developed one after the other, starting with the voltmeter function then C/R time constant function and finally ESR function. Results were checked by serial data transfer from Arduino Uno board to the laptop that is running the Arduino compiler with terminal. One Arduino Nano interface was constructed to interface the project shield. The firmware was developed to provide the voltmeter function, C/R time constant function and ESR function. An organic light-emitting diode (OLED) display was used to show measurement results. Logic control was added to provide the required functions to work as intended, as well as an automatic short circuit detection at DUT terminals firmware which includes a calibration cycle. Conventional ESR meters are usually have complex hardware, in contrast the design presented in this work shifts the focus to the firmware so that hardware is uncomplicated. This reduces the cost that typically comes with more hardware components. Keywords : Capacitor, ESR Meter, C-R Time Constant, Arduino, OLED Display, Calibration DOI: 10.7176/CEIS/13-1-02 Publication date: January 31 st 2022
Highlights
This measurement device uses simple circuit design to measure capacitors with a Capacitor and Equivalent Series Resistance (ESR) Meter with high accuracy
This paper presents the development of a capacitor ESR meter, which covers capacitance and ESR measurements as well as the interrelationship of the constituent parts/circuits
Results were checked by serial data transfer from Arduino Uno board to the laptop that is running the Arduino compiler with terminal
Summary
This measurement device uses simple circuit design to measure capacitors with a Capacitor and ESR Meter with high accuracy. A resistor-capacitor connection in series across a voltage supply is the easiest circuit to implement and measure the time taken to charge a capacitor to 63.2% of charge. The equation for it is given by:. The formula to work out Vout when Vin, R1 and R2 is given as Figure 9 This potential divider is used to measure the supply voltage by analogue read (A0). The software in other designs do not follow this approach but enter the measured supply voltage as value in the firmware code This circuit is just two resistors R3, R4 to control the charge and discharge of a capacitor.
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