设计出一种能感应人体及环境温度的电风扇控制系统。单片机处理器AT89C51为系统的检测和控制核心，热释电红外传感器检测人体，DS18B20数字温度传感器感应环境温度。采用继电器代替传统电风扇的档位开关，根据人体红外感应信息控制风扇的开启和关闭，依据环境温度控制相应的继电器处于吸合状态，使风扇输出对应的风速。该系统集成到传统电风扇中，测试结果表明，系统实现了对风扇的自动启停及自动调速控制，具有推广应用价值。%In order to enhance the intelligence of the electric fans and reduce energy consumption ,an electric fan control system which can detect the human body and the environmental temperature is designed .The core of detection and control of this system is the AT89C51 MCU .The pyroelectric infrared sensor is used to detect the human body ,and the DS18B20 digital temperature sensor is used to test the environment temperature .The relays replace gear switches of the traditional electric fan . The opening and closing of the electric fan are controlled according to the human body infrared sensor information .The corresponding relay is controlled in a closed state in accordance with environment temperature size . Consequently , it makes the fan output correspond with the wind speed .The system is integrated to the traditional electric fans and is tested .The experimental results show that the system realizes the automatic start-stop and speed control function of the electric fan ,and has the application value to be spread .
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