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, ...
This library utilizes any Arduino pins to be used as AD9851 control pins. This will gives you flexibility to use or to reserve any Arduino pins for other functions. The drawback, the frequency update ...
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