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Microduino-KEYBOARD Sensor consists of eight keys with an analog interface output.
The analog key is used for detecting analog quantity. Each key is used to match different resistor for grounding on one side and connects VCC through a resistor one the other side. By pressing each key, you can get different analog values. Thus, you can tell the key from different analog value. With only one I/O interface, you can tell eight keys, which saves a lot.