Digital Ammeter Circuit using PIC Microcontroller and ACS712

The Digital Ammeter Circuit is designed to measure electrical current by combining analog sensing techniques with digital processing. At the core of the measurement path is the ACS712 current sensor, which utilizes a Hall effect principle to detect current flowing through its internal copper conductor. When current passes through this conductor, it generates a proportional magnetic field that the Hall sensor translates into an analog voltage output. This analog voltage is then fed into the analog-to-digital converter (ADC) channels of the PIC16F877A microcontroller. The microcontroller samples this voltage level, executes internal scaling and calculation algorithms to convert the raw ADC values into actual current units (amperes), and formats the data for visual output. A stable 12V power supply drives the system, regulated down to a clean 5V rail via the 7805 voltage regulator to ensure reliable operation for both the PIC microcontroller and the ACS712 module. Capacitors placed around the voltage regulator and power lines help filter out high-frequency noise and voltage ripples to maintain measurement accuracy. Finally, the processed current data is sent to a 16x2 LCD display, allowing users to read real-time current measurements directly from the hardware setup. The entire system is prototyped using a breadboard or perf board and connecting wires, and its software logic is typically developed and tested using the MPLAB XC8 Compiler and Proteus Simulation Software before hardware deployment.