DESIGN, SIMULATION AND CONDTRUCTION OF AN ARDUINO-BASED DIGITAL AC/DC AMMETRE

ABSTRACT This study presents the design and testing of an Arduino-based digital ammetre using a current divider network and an LCD display to measure DC Current ranging from 24 A-to-300 A for alternating current (AC). The system employed a 59 KΩ and 1 KΩ resistor network to scale down the input current, which was then read by the Arduino Nano’s analog-to-digital converter (ADC). The measured current values were compared with those obtained from a standard digital ammeter, and the errors were calculated. The results showed a maximum error of 2.08 %, with an average error of 1.52% and a standard deviation of 0.44%. The Arduino-based ammetre performed well within an acceptable range, demonstrating its suitability for low- to moderate-current applications. However, the error increased slightly at higher current levels, which can be attributed to the limitations of the resistor tolerances and the Arduino’s ADC resolution. The findings align with similar studies in the literature, confirming the reliability of Arduino-based ammetre in practical applications with moderate accuracy requirements.