基于MQ-2型传感器的烟雾探测报警器的设计

针对城市轨道交通、农业等应用领域的烟雾测试需要,设计了一种基于MQ—2型传感器的烟雾探测报警器;该烟雾探测报警器遴选单片机小系统(STC89C51)作为主控芯片,使用气体传感器(MQ—2)与温度传感器(DS18B20)实时采集烟雾浓度和温度信号,并通过ADC0809模数转换器来进行模拟信号与数字信号之间的相互转换,然后把转换完成的数字量输入单片机(STC89C51)中,单片机(STC89C51)再将烟雾浓度、温度等数字量输入LCD1602实现实时信号的显示;当环境中可燃气体浓度或温度等超过系统设定的阈值,烟雾探测报警器会通过灯光、声音2种方式进行报警,以实现智能化的预警提示;该烟雾探测报警器温度测试与阈值设定范围为0～99℃,烟雾探测范围为0～9级.基于MQ—2型传感器的烟雾探测报警器具有响应时间短、稳定性能好、性价比高、寿命长的特点,可广泛应用于城市轨道交通、农业等领域.

Design of a Smoke Detection Alarm Based on MQ-2 Sensor

Aiming at the needs of smoke testing in urban rail transit, agriculture and other application fields, a smoke detection alarm based on the MQ-2 sensor is designed. The smoke detection alarm uses a single-chip microcomputer system STC89C51 as the core controller of the smoke detection alarm. It uses the gas sensor MQ-2 and DS18B20 temperature sensor to collect the smoke concentration and temperature signals in real time, and conducts analog signals with ADC0809 analog-to-digital converters. Mutual conversion between digital signals, and then input the converted digital quantity into the single-chip microcomputer (STC89C51), and the single-chip microcomputer (STC89C51) then inputs the smoke density, temperature and other digital quantities into the LCD1602 to realize real-time signal display. When the concentration or temperature of combustible gas in the environment exceeds the threshold set by the system, the smoke detection alarm will send out the corresponding light alarm signal and sound alarm signal to realize the intelligent reminder of the smoke alarm. The smoke detection alarm has the characteristics of short response time, good stability, high cost performance, and long life. It can be widely used in urban rail transit, agriculture and other fields.