An Automatic Temperature Control System in Intelligent Buildings Using SoC

System-on-Chip (SoC) technology is constantly evolving and being applied in various fields such as the Building Automation System (BAS). Aiming to improve systems' performance and users' experience, BAS relies on SoC to control the electromechanical systems of intelligent buildings. In order to achieve temperature control, a temperature control system for smart buildings is proposed in this paper, which works in conjunction with air conditioning and windows controlled by direct current (DC) motors. For the purpose of environmental protection and energy saving, opening/closing windows always has a higher priority than open air conditioning. The system achieves temperature monitoring through the indoor and outdoor installation of temperature sensors. Users are allowed to set the desired temperature through a universal asynchronous receiver-transmitter transmitter (UART Tx). In general, the design contains three modules: SoC, external circuit design, and proportional, integral, and derivative (PID) control. All three modules work together to control DC motors to open/close windows at a certain angle with a certain angular speed. The SoC module contains a temperature control unit, a universal asynchronous receiver-transmitter receiver (UART Rx), and a digital-to-analog converter (DAC). The on-chip part of the system passed tests on a Field Programmable Gate Array (FPGA).