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STD 有毒气体报警器
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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。
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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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