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Photo resistors are light sensitive resistors whose resistance decreases as the intensity of light they are exposed to increases.
Flame Sensor 120 deg. range is able to detect the flame band respectively in the range of 700-1100 nm.
The Vibration module based on the vibration sensor SW-420 and Comparator LM393 to detect if there is any vibration that beyond the threshold. The threshold can be adjusted by the on-board potentiometer.