基于AT89S51单片机的红外语音报警系统

t present, electrical locomotive’s starting and braking in the running is determined by the motorman’s eyes. In this case of purely eyes, there will be some unavoidable failure. This paper is to solve the security issue of electrical locomotive’s running under the ground. In this paper, we have researched and designed a kind of intelligent alarm system which can play phonetic information automaticly. Pyroelectric infrared sensor is used for dectecting whether someone is close to the road of the electrical locomotive. When Pyroelectric infrared sensor has detected any abnormality signals that someone is coming to the car road, an interrupt request will be sent to the MCU. Next the MCU control phonetic circuit to play the phonetic information which has been recorded beforehand, to tell the motorman and passerbyes of the emergency which has occurred, so that they can take corresponding step on time to abatement accident. As the signal from the infrared sensor is too weak, so we introduce the signal magnified circuit and dispose it with special CMOS chip, then the signal is sent to the interface of MCU. The power of this system is supplied by DC/DC with switching power supply.