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Based on the principle of LC resonance
automatic lighting control
or temperature controller on the electric soldering iron
Onboard LED indicator for quick testing
12mm Reed Switch/Sensor Soil Moisture Sensor Based on the principle of12mm Reed Switch Sensor The 12mm reed switch sensor is an electrical switch operated by an applied magnetic field. The reed switch contains a pair (or more) of magnetizable, flexible, metal reeds whose end portions are separated by a small gap when the switch is open. The reeds are hermetically sealed in opposite ends of a tubular glass envelope. When the device is exposed to a magnetic field, the two ferrous pins inside the switch pull together and
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