Design and Implementation of Measurement Instrument Using Microcontroller

Abstract

In this research, the designed system is implemented to measuring voltage, current, resistance, frequency, and temperature measurement, based on a PIC microcontroller. The main theories for designing this system revolve around using rearrangements of Ohm’s law for measuring the three basic electric properties: voltage, current, and resistance, along with voltage dividers for extending measurement range. Temperature sensing is achieved by connecting an LM35 sensor to an ADC pin and measuring its voltage output. Frequency measurement is achieved by using the built-in counter directly to count signal pulses that occur in a unit time with no need for additional conversion circuitry. All measurement results are displayed on an alphanumeric LCD. Microcontroller program coding was done by using MikroC compiler, and then Proteus simulation environment was used to simulate the system prior to physical programming on hardware