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The ADKeyboard is a five button keypad module with a single analog voltage output.
The ADKeyboard Module saves on valuable I/O resources by providing 5 buttons that are read using just one of your microcontroller's analog inputs. It does this by using a built in Digital to Analog circuit that generates a different voltage level for each key press.
Connect the (VCC) and (GND) pins to a 5V power supply and the analog output (S) pin to an analog input on your robot's controller.