Microprocessor-Based Data Acquisition System for Analog Signal Measurement Using ADC and DAC Interfacing

Data acquisition connects the analog physical world with digital processors. This paper presents a microprocessor-based data acquisition system for analog signal measurement, using an analog-to-digital converter (ADC) for input and a digital-to-analog converter (DAC) for output, connected to a microprocessor training kit. The software reads and scales input voltages, displays or stores the data, and reproduces values at the analog output. Conversion accuracy, linearity and the achievable sampling rate are evaluated by calculation and simulation. In simulation the 8-bit ADC had a maximum deviation of 1.34 LSB from the ideal line (including quantization), the quantization error was ±0.5 LSB (9.8 mV) and the acquisition loop allowed about 6.9 kS/s.