2023-06-06 (Tu) KeyBoardolier Keyswitches checked

I downloaded Adafruit's library for PCF8574 and PCF8575 and rand the "pcf8575_read16buttons" example to scan all the inputs and print a message whenever I trigger an input. Since I use a diode matrix, I can only test one row at a time, but I can push all the buttons in that line.

At first, I could only read the top line of buttons, but all fifteen worked, so my wiring seemed solid. I tried toggling the microcontroller's outputs, but the problem was that I did not declare the pins as outputs, so they were floating and interfering with the signals. I assigned my outputs accordingly and manually confirmed that all 75 buttons worked.
Serial feedback from keyswitches

The rest of the posts for this project have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8

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