Many projects have existed out there (check out @samyk !) that turn Arduino HID keyboard devices into USB rubber ducky-likes. However, these devices are already themselves HID devices, and just ...
The I2CKeyPad library implements the reading of a 4x4 keypad by means of a PCF8574. Smaller keypads, meaning less columns or rows (4x3) can be read with it too. Since 0.3.2 the library allows a 5x3, ...
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