Fuzzy illumination supervision system based on PIC18F 6720 microcontroller

Considering the high randomicity and low precision of street lamp control in cities and the low usage efficiency in wee hours, a design of illumination supervision system based on PIC18F 6720 microcontroller is proposed, which applies fuzzy decision making theory. The hardware structure, fuzzy algorithm principles, decision-making algorithm and software design are presented. The measured environmental lightness and calculated lightness variation rate are taken as input variables, and the fuzzy sets and control rules are defined according to operational experiences with consideration of interfering factors, with which the automatic control of 'three-level brightness adjustment' is implemented. The 'timing on-off' control is used for reducing 'night wasting'. The system can communicate with remote monitoring center via GSM (Global System for Mobile communication) or telephone networks. Experiments prove that it saves electric power.