Hi,
I have some trouble with Arduino flame sensor, built in LEDs are mostly on without any flame source, when I cover it, they turn off. They aren't activating on light, I tried using phone flashlight as test and they aren't turning on. Tried adjusting potentiometer, but still same.
Hi, @vojkan123
Welcome to the forum.
You will find that the sensors are InfraRed sensors, not light sensors.
Not sure but this may help;
Flame-D Schematic.pdf (107.0 KB)
Tom.. 
What is the frequency of an incandescent filament? It is essentially "on fire."
Apparently this sensor works better at night time, so it is "too sensitive", taking IR sensors from the window or something, but potentiometer can't fix it. In Arduino IDE it shows between 400-500 when LEDs are on, but when it's off, value is around 40-50
Some infrared sensors are sensitive to the wavelength of fluorescent light. In any case, to avoid being triggered by something hot (or sunlight), you'll probably have to shield them so they have to be pointed directly at the source that you're trying to detect.
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