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The HC-SR04 is an inexpensive ultrasonic distance sensor that works out of the box with an Arduino.
A Magnetic Contact is an electrically controlled switch used for switching a power circuit, similar to a relay. Magnetic contacts give exact position of the door (open/close).
650nm 5mW 6mm Laser Dot Diode Module Red Copper Head Tube
Metal Detector with speaker and ttl output.
Model / Part NumberMQ-2Target gasesLPG,Propane and HydrogenOperating Voltage5VOperating Humidity0-95%RHPreheat DurationOver 48 hoursHeater Voltage5.0 V +/- 0.2 VHeater Resistance31 ohm +/- 3 ohm
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