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toxic gas alarm

2 years ago 1341
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Description

1、Working principle: when the ambient air is normal, the corresponding resistance value of the gas sensitive element QM-2, the resistance in the R3, RW voltage to make the 555 set, 3 pin output high level, the alarm circuit is disconnected, no alarm. Voltage when the detection of gas sensor to gas, liquefied petroleum gas, gasoline, alcohol, smoke and other toxic gases, its resistance decreases, the resistor R3, RW partial pressure increases, thus the 555 reset, pin 3 output low level, making the relay and switch on the alarm circuit, sound and light alarm signal. 2、Description of each function module: enter image description here

3、Components and PCB board map: enter image description here

4、Physical map after welding:

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enter image description here

enter image description here

Documents

有毒气体报警器

有毒气体报警器

BOM

ID Value Qty. Package Components Manufacturer Part Supplier SeeedStudio
1 QM-2 1 mq-2 MQ
2 SIP2 2 HD_1X2 S1P1,S1P2
3 NE555P 1 DIP8-2.54-10.9X6.6MM U3 NE555P SeeedStudio 310110001
4 1K 2 PR-D2.3XL6.5MM R1,R2 FHCFR-1/4W-000J SeeedStudio 301020004
5 130R 1 PR-D2.3XL6.5MM R3 FHCFR-1/4W-000J SeeedStudio 301020004
6 5.1R 1 PR-D2.3XL6.5MM R4 FHCFR-1/4W-000J SeeedStudio 301020004
7 IR523B-W60W1 2 z-5mm-led D1,D2 SeeedStudio 304090159
8 10k 1 rw1 RW
9 1N4148 1 Seeed-DO-35 D3 1N5227B SeeedStudio 304030011
10 HK4100F 1 hk4100f Q1
11 8 1 BEEP-12 S2
12 SPST_ON 1 KEY S3

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