Batteries are DC sources, several range of voltages and dimensions are found on the market, some are 1.5V, 3.7V and 9V with various dimension such as AAA, AA and PP3. Voltage is an important aspect in a battery, the voltage could be measured using a multimeter and a specific voltagemeter device for battery. The latter device cannot be used to measure voltages in various dimensions and voltage of batteries. According to the problem, a battery voltage-meter is made for all types of batteries with a voltage rating ranging from 0-10V. The device could replace the current voltage-indicator device for battery. Arduino nano is employed as controller and a LCD is used to display the voltage. The analog to digital converter pin on Arduino is used to read the voltage, voltage source is an analog signal. The signal is converted by the microcontroller into a digital one. The digital signal is processed by microcontroller and the result is shown on LCD. Due to the device is designed to measure a maximum 10V battery, a voltage divider circuit is employed. The microcontroller could accept 5V. The resistors used in the voltage divider circuit are the 4.7k and the 10k series arrangement. Based on voltage indicator test, the device has a better accuracy when using 10k resistor compared to 4,7k. It displays voltage value up to two digit after the comma. Our device solves limitation of the current device in market which is just to be able check a specific type of battery.
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Pauzan et al. (2021) studied this question.