go away spammer

Author Topic: Fire Detection?  (Read 2653 times)

0 Members and 1 Guest are viewing this topic.

Offline YoungGeniusTopic starter

  • Jr. Member
  • **
  • Posts: 18
  • Helpful? 0
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

  • Contest Winner
  • Supreme Robot
  • ****
  • Posts: 347
  • Helpful? 2
Re: Fire Detection?
« Reply #1 on: March 25, 2010, 08:14:29 PM »
It'd use and infrared detector like this .
"God chose to make the world according to very beautiful mathematics."
-Paul Dirac
**************************************************************
Its Hawaii Five-O. Get it?

Offline waltr

  • Supreme Robot
  • *****
  • Posts: 1,944
  • Helpful? 99
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

  • Contest Winner
  • Robot Overlord
  • ****
  • Posts: 125
  • Helpful? 3
    • Probots
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

  • Contest Winner
  • Supreme Robot
  • ****
  • Posts: 347
  • Helpful? 2
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.
"God chose to make the world according to very beautiful mathematics."
-Paul Dirac
**************************************************************
Its Hawaii Five-O. Get it?

Offline SmAsH

  • Supreme Robot
  • *****
  • Posts: 3,959
  • Helpful? 75
  • SoR's Locale Electronics Nut.
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.
Howdy

Offline Soeren

  • Supreme Robot
  • *****
  • Posts: 4,672
  • Helpful? 227
  • Mind Reading: 0.0
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.
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline nottoooily

  • Full Member
  • ***
  • Posts: 91
  • Helpful? 3
Re: Fire Detection?
« Reply #7 on: March 27, 2010, 03:32:07 AM »
smoke alarm??

Offline Soeren

  • Supreme Robot
  • *****
  • Posts: 4,672
  • Helpful? 227
  • Mind Reading: 0.0
Re: Fire Detection?
« Reply #8 on: March 27, 2010, 09:22:47 AM »
Going off each day at dinner time ;D
Regards,
Søren

A rather fast and fairly heavy robot with quite large wheels needs what? A lot of power?
Please remember...
Engineering is based on numbers - not adjectives

Offline aruna1

  • Supreme Robot
  • *****
  • Posts: 381
  • Helpful? 4
  • I'm an Ordinary guy
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.
I'm Me

Offline amando96

  • Robot Overlord
  • ****
  • Posts: 187
  • Helpful? 1
Re: Fire Detection?
« Reply #10 on: April 08, 2010, 04:57:37 PM »
Rorcle, 60% complete
AATV, 5% complete

 


Get Your Ad Here