Thanks for the quick responserpt007 wrote: ↑Sun Feb 17, 2019 9:02 amThere are several ways to use the wallbox buttons.
1. use Raspi‘s GPIOs as input pins
2. use an old USB Keyboard and its built in controller (there are several instructions in youtube)
3. use an Arduino Leonardo or Teensy as button-USB converter
In my Wurlitzer project I use the original keyboard buttons with a Teensy 3.2.
I added some additional buttons which will use the Teensy and GPIO.
First thing you wanna do: get a multimeter and find out how your keyboards work.
So, if you count one wire more than buttons of a keyboard, most likely there is one common wire and this common wire connects with the very button which you press.
Identify that common wire (using the ohm measuring) and mark the other ones which get connected to common when pressing a button with its number.
Modern keyboards are wired in arrays (matrices) to reduce the number of wires.
But first tell us what kind of keyboard you have and then we can assist you with the next steps.
I would like to use the the original buttons that came with the wallbox
This the model I am working on Rockola TriVue ( tried to add my own images but they are all too large in file size)
The buttons are mechanical (spring loaded) .They are wired to a pcb board with one central ground on a sliding mechanism that slides back and forth when a button is pressed.The button itself slides forward to make contact on the pcb board and close the connection. The wiring harness is very convoluted and hard and to follow but it does end at several old connectors.
This unit I believe was made in the seventies so it is a little dated .
I would like to keep the original retro look of the box as much as possible but I think I might have to look at a modifying a USB keyboard.
I recently saw a video on YouTube ( I believe it was posted by Mike the author of fruitbox) where he showed his setup and the buttons he used. I am sure this would work but I can’t seem to find anymore information about the parts he used and how to set it up.
Again thanks for the quick response much appreciated