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Download the free app"USB OTG Checker")
The Leonardo differs from all preceding boards in that the ATmega32u4 has built-in USB communication
Arc Discharge Distance: 10mm~20mm
死区宽度
These make great obstacle detectors and can also be used as an optical gate or in positioning applications where stopping at certain distance is needed
Non-Contact Liquid Level Sensor Binary Adder Download the free app"USB OTGIntoduction: on contact liquid level sensor can be used to provide external monitoring in liquid non metallic material tubes, pipes and tanks such as plastic, glass, fiber glass and ceramics. The thickness of the tube pipe tank container should be less than 10mm. It is easy to use as a led is on when the liquid level reached and voltage is detected from sensor output. The contactless liquid level sensor can be used in household appliances products,