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This switch is a device used to sense the level of liquid within a tank, it may actuate a pump, an indicator, an alarm, or other devices.
The flame sensor can be used to detect fire or other wavelength at 760 nm ~ 1100 nm light. The Flame sensor is very sensitive to the flame and can respond to the regular light, it’s generally used for fire alarm purposes.
Photo resistors are light sensitive resistors whose resistance decreases as the intensity of light they are exposed to increases.