I'm asking for help to validate following schema. I'm a nob in electronics, this project is not a professional project, just for fun. Please, be kind to me. Thanks.
I would like to connect a piano toy keyboard to Arduino to get MIDI notes through USB connector.
The keyboard has a matrix layout like this:
Example 1: When power flow is set to P23, if pushbutton 1 is pressed, the power flow arrives to P30. If, also pushbutton 9 is pressed, power flow, also, arrives to P31. Please check "On/off switches board pinout labels" for piano keyboard details.
Notice that I only can to send +5v from one pin (from P10 to P23) at a time. On Example 1, If flow is sent from all the pins at a time, we can't know witch pushbutton from 1 to 8 was pressed.
What I have thought
Because the keyboard has a lot of pins I guess I need to use a multiplexer. One multiplexer for 5V output (only output one pin at a time).
This is the schema I have in my mind:
For me, looks like a solution, to connect P30, P31, ... P40 to Arduino digital inputs and multiplexing with +5v one pin at a time from P10 to P23 using the multiplexer module.
This is what a have:
I would like to know if my solution is right, or they are a more clever/elegant solution.
I'm not an electronic hacker guy, I'm looking for a project I can do with my daughter and have a bit of fun. Please, be kind. This is not a module for a nuclear power plant, just a summer side project. Any help is welcome. Also, sorry about my poor English, if some part is confused, please, let me know to try to write a proper explanation.