A Keypad for Input

I think I am going to use a keyboard to get started. It will be useful for:

• Selecting the different filters in the DAC
• Adjusting the digital volume in the DAC
• Selecting between PCM and DSD in the DAC
• Mute/unmute

A rotary encoder is a cool feature because it allows the use of a knob and a knob is a big part of audio :-)

I found this keyboard in ebay, which is perfect for my serial LCD which also has input for a 4x4 matrix keypad