说明：  STM32对传感器检测到的光强度信号进行A/D转换、线性化处理后，将检测值与报警限设定值相比较，判断是否报警。同时送入显示器显示通道及相应的数字量。主程序还包括状态指示灯及按键功能，中断子程序等，使报警器功能更加完善，给用户带来便利 发生火灾环境下系统的运行? 当火源进入到系统光强报警限内的时候，并且火焰传感器状态灯变为红色报警状态，蜂鸣器开始鸣响 当火源熄灭后，光强值恢复到报警限以外，火焰传感器状态灯恢复为绿色，蜂鸣器停止鸣响。
(STM32 performs a / D conversion and linearization on the light intensity signal detected by the sensor, and then compares the detection value with the alarm limit setting value to determine whether to alarm. At the same time, it is sent to the display channel and corresponding digital quantity. The main program also includes status indicator light and key function, interrupt subprogram, etc., which makes the alarm function more perfect and brings convenience to users Operation of the system in case of fire: when the fire source enters the light intensity alarm limit of the system, and the status light of the flame sensor changes to the red alarm state, the buzzer starts to sound When the fire source goes out, the light intensity value returns to beyond the alarm limit, the flame sensor status light returns to green, and the buzzer stops ringing.)