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Questions tagged [smoke-sensor]

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0
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2answers
86 views

Use of relay in a gas sensor (safety issue)

I have developed an MQ-5 based LPG gas sensor which uses a relay. Is the relay itself a fire hazard (while switching) if gas is in the vicinity ? Thanks.
0
votes
1answer
76 views

Mq4 sensor doesnt detect natural gas but detects cigarette lighter gas only! [closed]

I am working on a project for detecting natural gas of cooking stoves, I have tested several sensors but the mq4 sensor was the one that worked fine. Now after about one month of using the sensor i ...
-3
votes
3answers
1k views

Is smoke sensor safe for eyes / kids? [closed]

So I was researching stuff about smoke sensors and I may be paranoid but I was wondering if they were Safe for kids and in general , I read they had infrared LEDS which I heard were very harmful for ...
0
votes
1answer
65 views

Simple circuit slowly powering down

I have a gas sensor module here, with a power led and a digital out led (which glows in case of successful gas detection) built in it.... A simple circuit here, just connected the vcc and ground of ...
0
votes
1answer
177 views

Why are ionization smoke detectors bad at detecting smoldering fires?

I have been doing some research on the differences between ionization and photoelectric smoke detectors, and main differences in their capabilities, seems to be their ability to detect different kinds ...
0
votes
0answers
473 views

Optical Smoke Detector design with Arduino: buzzer problem

I'm working on an Optical Smoke Detector using Arduino UNO board. Here is the circuit diagram: Whenever smoke is detected by the smoke sensor, the buzzer and LED should work. From the Arduino ...
5
votes
2answers
2k views

Why does this CO detector forbid the use of lithium batteries?

I have several Kidde KN-COB-LP2 CO detectors installed in my house. They look like this: They operate on standard AA-size alkaline batteries, and typically last several years on such batteries. The ...
3
votes
2answers
1k views

smoke detector for that “burning electronics” smell?

We all know that characteristic odor of fried electronics... when you "let the magic smoke" out of the chip. Unfortunately it doesn't seem to set of ordinary smoke detectors, at least not at ...
0
votes
2answers
253 views

Datasheet for XC370696P (Smoke Detector IC)

I decided on a whim to take apart an old smoke detector that desperately needed replacing, and after some ripping, I got to the guts of the thing. Neat stuff. Clearly the brains of the detector is ...
4
votes
1answer
138 views

determining sensitivity of carbon monoxide sensor

i'm working with a alphasense CO-AF sensor & i need to find out the CO quantity in ppm . i referred to the data sheet of the device and i dont know how to convert the given sensitivity ...
4
votes
1answer
2k views

Smoke detectors replacing - why? Lifetime of components?

I often see that smoke detectors "should be replaced" every 5, 10 or 20 years. Like on this website for example: http://modernsurvivalblog.com/health/did-you-know-smoke-detectors-expire/ The U.S. ...
-4
votes
1answer
81 views

how can i using CPU8085 and PIO8155 crate an alarm circuit and program [closed]

example ; we have smoke sensor, speaker and my circuit.When Sensor has been active, speaker to sing it. i'm newbie in this topic. how can i do it like this circuit ?
0
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2answers
738 views

Phototelectric smoke sensor with microcontroller

I am trying to connect a photoelectric smoke sensor with Atmega328. The smoke sensor IC has pin 7 as the I/O pin which gives a 9V when smoke is detected. I have connected this pin to the input pin of ...
1
vote
1answer
809 views

smoke fire alarm circuit and relay SPDT

I want to put relay SPDT in the output of the below circuit to connect with circuit working in 12v. when the buzzer run the relay switch on or off to another circuit automatically I want to run it ...
0
votes
3answers
349 views

How to use MQ-2 module?

I am totally new to hardware. Recently I bought this MQ-2 module, but I couldn't figure how to get it to work, the on the ship worked but where is the output? I mean the place where I place the ...
3
votes
2answers
407 views

Shifting voltage level for reading sensor output on microprocessor

I realized a prototype-board with an old ATmega8 and a particle dust sensor. Both supplied with the 5V. The sensor output voltage is normally high (>4V), and falls below 0.7V if the sensor detect the ...
7
votes
5answers
40k views

Why do smoke detectors go off when lightning strikes?

Just experienced this, I saw lightning outside my window (not hitting our building or anywhere close to it), and immediately after the smoke detector went off for a short while. Can anyone explain ...
2
votes
5answers
774 views

Looking for an inexpensive Smoke Detection Sensor

As the title says, I am looking for a smoke detection sensor. Took a look from SparkFun to Mouser and did not find anything. Is there a part you would recommend? I would prefer something that ...