随着科学技术的飞速发展，人们已经进入了现代化信息时代。传感器技术作为一

With the rapid development of science and technology, people have entered the modern information age. As a means of obtaining information, sensor technology has made great progress, and its application fields are becoming more and more extensive, but the requirements are getting higher and higher, and the demand is becoming more and more urgent. With the widespread use of electronic products in human life, this will lead to more and more fires happening, and hidden fire hazards are hidden in our lives. In order to avoid fires and reduce the losses caused by fires, we need to develop and improve automatic fire alarm systems and use them extensively in life to extinguish fires to minimize the loss of social wealth. <br>The system takes the resistance smoke sensor, temperature sensor and single-chip technology as the core, and combines them with other electronic technologies to design a more advanced fire alarm. Among them, the MQ-2 type semiconductor combustible gas sensing element smoke sensor is used to detect smoke, has the advantages of high sensitivity, fast response speed, strong anti-interference ability, etc., has the advantages of low price and long life. Use DS18B20 temperature sensor for temperature detection. The selected AT89S51 MCU integrates resources such as A / D conversion, hardware multiplier and hardware pulse width modulator. It has the advantages of high speed, low power consumption and strong anti-interference, and is a cost-effective product among similar technologies. <br>The fire alarm designed with AT89S51 single chip microcomputer, MQ-2 semiconductor resistance smoke sensor and DS18B20 temperature sensor as the core can realize the functions of sound and light alarm and alarm limit setting. It is an intelligent smoke alarm with relatively simple structure and stable performance.

With the rapid development of science and technology, people have entered the era of modern information. As a means of obtaining information, sensor technology has made great progress, and its application fields are more and more extensive, but the demand is higher and higher, and the demand is more and more urgent. With the widespread use of electronic products in human life, this will lead to more and more fires, and fire hazards hidden in our lives. To avoid fires and reduce the damage caused by them, we need to develop and improve automated fire alarm systems and use them extensively in our lives to minimize the loss of social wealth.<br> The system is centered on resistance smoke sensors, temperature sensors and microcontroller technologies, and combines them with other electronic technologies to design higher-tech fire alarms. Among them, MQ-2 semiconductor combustible gas sensing element smoke sensor is used to detect smoke, with high sensitivity, fast response speed, strong anti-jamming ability and other advantages, with low price, long life advantages. Temperature detection is carried out using the DS18B20 temperature sensor. The selected AT89S51 microcontroller integrates A/D conversion, hardware multiplier and hardware pulse width modulator, has the advantages of high speed, low power consumption and strong anti-jamming, and is a cost-effective product in the same technology.<br> The fire alarm, which is designed with the AT89S51 microcontroller, the MQ-2 semiconductor resistive smoke sensor and the DS18B20 temperature sensor as the core, can realize the alarm and alarm limit setting function. It is a relatively simple structure, stable performance of intelligent smoke alarm.

With the rapid development of science and technology, people have entered the modern information age. Sensor technology as a means of obtaining information, sensor technology has made great progress, its application field is more and more extensive, but the demand is more and more high, the demand is more and more urgent. With the widespread use of electronic products in human life, it will lead to more and more fires, and hidden fire hazards in our lives. In order to avoid the fire and reduce the loss caused by the fire, we need to develop and improve the automatic fire alarm system, and widely use it in life to extinguish the fire, in order to minimize the loss of social wealth.<br>The system takes resistance smoke sensor, temperature sensor and single chip microcomputer technology as the core, and combines them with other electronic technology to design a fire alarm with higher technology level. Among them, mq-2 semiconductor combustible gas sensor smoke sensor is used to detect smoke, which has the advantages of high sensitivity, fast response, strong anti-interference ability, low price and long service life. Use DS18B20 temperature sensor for temperature detection. The selected AT89S51 single chip computer integrates a / D conversion, hardware multiplier, hardware pulse width modulator and other resources. It has the advantages of high speed, low power consumption and strong anti-interference, and is a product with high cost performance in the same technology.<br>Based on AT89S51 single chip microcomputer, mq-2 semiconductor resistance smoke sensor and DS18B20 temperature sensor, the fire alarm is designed, which can realize the function of sound light alarm and alarm limit setting. It is a kind of intelligent smoke alarm with relatively simple structure and stable performance.