Enabling Scalable Analog/Digital Conversion and I/O Expansion over Ethernet for Intelligent DAQ Systems

This paper proposes a scalable DAQ system using a 12-bit DAC, Op-Amp, and I/O expander connected to an ESP32 via Ethernet. Prioritizing its precision and amplified voltage control, component selection considering DAC linearity (INL, DNL) and rail-to-rail operation. Proteus simulations aided design, and hardware followed datasheets. Challenges in DAC selection highlight the importance of rigorous evaluation. This work offers a method for scalable DAQs with integrated functionalities, paving the way for intelligent applications. In conclusion, the evaluation confirms excellent DAC linearity, ensuring accurate voltage control for each digital input.