基于单片机烟雾火灾检测仪系统设计（毕业设计论文）.doc

届 别 学 号 毕业设计 基于单片机烟雾检测仪系统设计 姓 名 系 别、 专 业 导 师 姓 名、职 称 完 成 时 间 TCARABST With the development of society and economy, fire protection work more and more important, but at present, many domestic research focused on large place fire alarm.We, therefore, it is necessary to develop a kind of simple structure, economical and practical family smoke alarm to adapt to the demand of the market.Based on smoke alarm for family use should have the basic requirements and functions, the article designed a suit to the smoke alarm. This design USES the smallest system controlled by STC89C52, DS18B20 temperature sensor, four Yang digital tube display, power supply module, a buzzer alarm module, keys module, MQ - 2 alcohol detection module and ADC0832 analog-to-digital conversion module.Alcohol sensor MQ - 2 real-time detection of alcohol gas in the air, pressure way through resistance points in the ADC0832 modulus conversion chip data transformation, after a single-chip processing on the digital tube display the concentration of alcohol, at the same time using ds18b20 temperature sensor testing environment temperature, after conversion operation is conducted on the digital tube display.Can through the three keys to alcohol and temperature alarm value set.When actual the alcohol concentration and the environment temperature is greater than the set of alcohol concentration and the setting temperature value, through the buzzer alarm.System buttons also has the function of add, subtract, you can set the alcohol concentration and high temperature alarm value, can be an emergency alarm and manual cancelled an emergency alarm function, when in special circumstances can press the emergency alarm button alarm, and power save function, set the parameters of the stored in the MCU int