Grand Piano

[Kapinson]

Hi,

I'm planning to make a grand midi piano using Raspberry Pi, but I don't know how can i deal with a huge number of imputs, which is 88 piano keys. I want to make a captive keys, so I can measure how strong certain note is pressed. At first i thought of using multiple MCP3008 but i learned that I can connect only 2 at once using SPI. Could You please give mi a hint, how to get multiple(at least 88) inputs to Raspberry?

Regards
K
EDIT:
Ok, nevermind - i just found MCP23017 to I2C and MCP23S17 to SPI which gives me over 400GPIO so generally, problem solved

[DougieLawson]

Use MCP23017s they give you 16 inputs and you can stack eight on a single I2C bus. With the MCP23017 interrupt lines tied to a GPIO you'd be able to detect when one of the MCP23017 inputs if triggered.

[Douglas6]

Or buy a cheap MIDI piano keyboard.