How to use ADC in ARM7 LPC2148 - Measuring Analog Voltage

This project builds a digital DC voltmeter centered around the ARM7 LPC2148 microcontroller and its integrated Analog-to-Digital Converter (ADC) peripheral. Power is supplied externally via a 9V battery, which is stepped down using 5V and 3.3V voltage regulator ICs to safely power the digital logic and microcontroller subsystems. Two 10K potentiometers are integrated into the circuit to function as adjustable voltage dividers, routing variable analog voltage signals directly into the microcontroller's designated ADC input pins. Keil uVision5 is used to write and compile the C firmware, while the Flash Magic Tool handles flashing the binary onto the chip via a USB cable. Once programmed, the LPC2148 continually samples the analog voltage from the potentiometer wipers, converting the continuous analog voltage levels into digital binary values through its internal successive approximation register ADC. The microcontroller then processes this digital data to calculate the corresponding voltage value. Finally, the computed measurement is dynamically rendered onto a 16x2 LCD display, giving real-time visual feedback of the varying input signal. An LED can also be tied to the circuit for visual state indication or power verification, while the entire assembly is prototyped securely on a breadboard using standard connecting wires.