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Author Topic: Fire Detection?  (Read 1503 times)

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Offline YoungGeniusTopic starter

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Fire Detection?
« on: March 25, 2010, 05:49:29 PM »
How do I make a small sensor that I could put at the rim of a pot (over the stove) so that when it detects too much light it sets an alarm off?

Offline Hawaii00000

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Re: Fire Detection?
« Reply #1 on: March 25, 2010, 08:14:29 PM »
It'd use and infrared detector like this .
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Offline waltr

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Re: Fire Detection?
« Reply #2 on: March 26, 2010, 07:04:28 AM »
It'd use and infrared detector like this .

This will only detect IR light modulated at 38kHz. It will not detect a fire under the pot which is want I believe the OP wants to do!

Offline Pratheek

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Re: Fire Detection?
« Reply #3 on: March 26, 2010, 08:49:05 AM »
A cheap and simple solution would be to use Light Dependent Resistor(LDR) or a photoresistor. Search the internet for the circuit. It is quite a popular circuit and should be available.

You will also have to some how insulate the sensor from the flame, so the the parts themselves do not catch fire!

Offline Hawaii00000

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Re: Fire Detection?
« Reply #4 on: March 26, 2010, 10:28:25 AM »
You could use an  IDR, but it go off from other souces of light. An IR detector will only sense IR which is given off by a flame. I'm not sure exactly what frequencies a flame gives of, but I don't think that wouldn't be to hard to find.
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Offline SmAsH

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Re: Fire Detection?
« Reply #5 on: March 26, 2010, 02:48:09 PM »
Yes, IR would work but that sensor blocks out anything above or below 38kHz which could cause problems. An ir sensor could work but it would need to be wide range.
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Offline Soeren

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Re: Fire Detection?
« Reply #6 on: March 26, 2010, 11:59:28 PM »
Hi,

How do I make a small sensor [...] when it detects too much light it sets an alarm off?
Many fire alarm systems include thermal detectors, as a quite effective means of detecting fire.
I don't know exactly what fire you wanna detect, the ones under the pot or those that may arise from forgetting your stew for too long (Which may sometimes only result in a glowing mass and black smoke).
In each case, a thermocouple bead could be a viable solution, as in any case, the temperature will rise rather quickly in case of a fire. Further, Thermocouple beads come in variants that easily cope with 1300°C.
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Offline nottoooily

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Re: Fire Detection?
« Reply #7 on: March 27, 2010, 03:32:07 AM »
smoke alarm??

Offline Soeren

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Re: Fire Detection?
« Reply #8 on: March 27, 2010, 09:22:47 AM »
Going off each day at dinner time ;D
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Søren

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Offline aruna1

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Re: Fire Detection?
« Reply #9 on: March 31, 2010, 12:34:13 AM »
HI,
i made a fire sensor for fire fighting robot competition which won both 1st and 2nd places.
I used a simple IR detector(one like 2SD400 transistor bt only with 2 pins) and a differential amplifier.it works very well.only draw back is its sensitivity greatly reduces with sun light.
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Offline amando96

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Re: Fire Detection?
« Reply #10 on: April 08, 2010, 04:57:37 PM »
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