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Indoor environmental parameters monitoring for building automation systems

This article presents the implementation of a novel architecture of a specialized measurement and control system that is intended to be integrated in a complex automation system for buildings. The proposed design is realized around Atmega 328 microcontroller embedded on Arduino Uno development board. For indoor environmental monitoring are used different sensors associated with various physical quantities. In our approach were used three types of sensors: a combined temperature-humidity sensor (AM2302/DHT 22) characterized by a high precision and having digital output and digital pressure sensor (BMP 180) together with a light depended resistor (LDR) for light intensity measurements. The system is extendable and in the proposed configuration is capable to control multiple loads, including pulse width modulation (PWM) based proportional control. The correct operation and the reliability of the monitoring and control system were evaluated through simulations and practical test with implemented module. Compared with other implementations, the proposed design has the advantage of a flexible and versatile implementation, based on reconfigurable concepts specific to the high performance programmable microcontrollers, combined with a simple user interface for equipment control.