Using K8055 to send out keystrokes

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1

Hi there,

I want to use the K8055 to send out keystrokes to a computer according to some digital input.
I managed to do so using a python script.
No I want to send the keystrokes via a real keyboard. Via the digital output I want to tirgger a button press.

I bought a simple num-pad and disassembled it. Now I have a (i assume simple) question about the wiring.
The control unit of the num-pad has 13 contacts.
In order to create a button press on of the first 7 contacts has to be connected to one of the second 8 contacts.
This works by connecting the two with a piece of wire. .

What I don’t understand is how to connect it to the K8055, how would my wiring look like? especially, what would I do with the GND?

Any suggestions
Thanks
Martin

2

Please see this link “Scanning to Detect Key Presses”:
dribin.org/dave/keyboard/html/scanning.html
“In order to detect key presses, the keyboard controller will scan all columns, activating each one by one.”

Connect the column terminals C1, C2 etc. to the digital outputs of the K8055.
Connect the row terminals R1, R2 etc. to the digital inputs of the K8055.
The GND is not needed to connect.

Activate only one digital output at time.
If the button is pressed, one of the digital inputs will be pulled down.
Based on the output and input data you can see which one of the buttons is pressed.