Система управления температурой внутри помещения, основанная на технологии связи по видимому свету

Abstract

The article proposes a new approach to temperature control in a building based on the Visible Light Communications technology. This approach is based on using LED lamps as temperature data transmitters as well as for lighting. Light modulation based on the UART standard was used for data transfer. A photodiode with the capability to distinguish relatively weak signals was used for receiving data. All data processing was performed by microcontrollers. UART-based modulation was also performed on a microcontrolle. The article describes in detail schematic circuits of transmitting and receiving devices. Based on developeed schematic circuits, a new experimental setup consisting of two units was created. The transmission unit includes a temperature sensor, a microcontroller, a driver and an LED. The receiving unit includes a photodiode, an amplifier and a microcontroller. An ATmega328P chip was used for both microcontrollers. Experimental setup consists of experimental models of both units. For signal transmission control, measurements of the pulse level and shape were conducted in the receiving device with an oscillograph. The signal level was anaylsed after all electronic components but before entering the microcontroller. Experimental results have shown that data transmission with the use of white LEDs was relatively stable. This allows the possibility of organising wireless control of temperature conditions on premises without Wi-Fi. Perspective uses of temperature control with white LEDs approach include the creation of “Smart house» control system without using wirelines and with cheap microcontrollers, which signficiantly decreases costs of the system.