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toxic gas alarm

2 years ago  

Status: Complete

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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:
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3、Components and PCB board map:
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4、Physical map after welding:

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有毒气体报警器

有毒气体报警器

有毒气体报警器

有毒气体报警器

BOM

IDValueQty.PackageComponentsManufacturer PartSupplierSeeedStudio
1QM-21mq-2MQ
2SIP22HD_1X2S1P1,S1P2
3NE555P1DIP8-2.54-10.9X6.6MMU3NE555PSeeedStudio310110001
41K2PR-D2.3XL6.5MMR1,R2FHCFR-1/4W-000JSeeedStudio301020004
5130R1PR-D2.3XL6.5MMR3FHCFR-1/4W-000JSeeedStudio301020004
65.1R1PR-D2.3XL6.5MMR4FHCFR-1/4W-000JSeeedStudio301020004
7IR523B-W60W12z-5mm-ledD1,D2SeeedStudio304090159
810k1rw1RW
91N41481Seeed-DO-35D31N5227BSeeedStudio304030011
10HK4100F1hk4100fQ1
1181BEEP-12S2
12SPST_ON1KEYS3

Comments

Aray

How much is "toxic gas alarm" vgotovom form?

Aray

How much is "a toxic gas alarm" off the shelf?

dxfmarket

good

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