Abstract: With regard to the large area, decentralized monitoring points, weak security forces in large shopping malls, warehouses and residential areas, a multi-point monitoring and wireless alarm system based on pyroelectric sensor is designed. Compared with other sets of monitoring equipment, the system is simple in structure, flexible in use, reliable in operation and high in cost performance, and hence has a high practical value.

Key words: pyroelectric sensor, multi-point monitoring, wireless alarm, STC89C52