i need to know types of sensor...urgent!

[max]

i want to build a fire fighting robot...
but i dont know what is the suitable sensor that can be used to detect the flame of candles..
plz help me...
tq...

[sich]

http://en.wikipedia.org/wiki/Flame_detector#IR.2FIR_flame_detection
http://www.me.utexas.edu/~ezekoye/rsch.dir/firesite/flame_detector.html

The famous one is Hamamatsu UVTron series used by most fire fighting robots. However, Cytron doesn't sell any of Hamamatsu flame detector at the moment.

A low-cost solution would be using IR sensor. I think the teams who participated MURoC fire fighting game organized by UniMAP, Perlis this year is using this method. It should be no problem for you to find similar solution in the web.

[shahrul]

You can try either heat sensor or light sensor.