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STD 有毒气体报警器

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Creation time: 2016-05-30 10:45:23
Update time: 2021-04-12 09:32:28
Description
本系统设计采用555芯片作为控制器,当环境空气正常时,气敏元件MQ-2相应的电阻值及电路图中的R3、RW电阻使555芯片的3脚输出高电压,报警电路断开。当MQ-2检测到环境中存在有毒物质时,电阻减小,使555芯片复位,3脚输出低电平,驱动报警电路工作,同时发出声光信号。
Design Drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 QM-2 MQ mq-2 1
2 SIP2 S1P1,S1P2 HD_1X2 2
3 NE555P U3 DIP8-2.54-10.9X6.6MM 1
4 1K R1,R2 PR-D2.3XL6.5MM 2
5 130R R3 PR-D2.3XL6.5MM 1
6 5.1R R4 PR-D2.3XL6.5MM 1
7 IR523B-W60W1 D1,D2 z-5mm-led 2
8 10k RW rw1 1
9 1N4148 D3 Seeed-DO-35 1
10 HK4100F Q1 hk4100f 1
11 8 S2 BEEP-12 1
12 SPST_ON S3 KEY 1

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