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Photosensitive Acousto-optic Alarm Module for Arduino
Used to detect ambient light£¬ when the light is bright£¬ it will alarm; W1 is adjustable resistance£¬ used to adjust induction sensitivity£¬ GMDZ is photoresistance£¬ when the light becomes bright£¬ rhotosensitive resistance value will reduce£¬ the current flowing into Q1 base is large£¬ Voltage of triode collector reduce£¬ DI light up£¬ R2 is current-limiting resistance; Meanwhile£¬ Through R1 base current flowing into Q2 base£¬ Q2 enter into saturation condition; SP1 is buzzer.