说明：  51内核单片机做的空气净化器源码-空气传感器调的很辛苦，当然最后通过了，还有原理图供大家参考，段式液晶屏，我PCBlayout的，技术不合理处请大家指证
(51 core microcontroller do air purifiers source- air sensor tone is very hard, of course, finally passed, there are schematics for your reference, Segment LCD screen, I PCBlayout, technical unreasonable please testify at)