How to make a small keyboard with 3 Fermion AdKey numeric modules

For some projects like Cyberdecks you need a small keyboard. Is it possible to make a small keyboard using 3 cheap numeric keypads?

For this project we will use 3 Fermion AdKey and 1 Arduino Nano

Connect all 3 modules to VCC and GND of the Arduino Nano and each output of the modules to Arduino A3, A4 and A5 

In the software, you have to map every letter to a combination of module and resistor level.

Here you can find an example 

You can download a 3d printed enclosure from Cults3d

Now every letter will be recognized by the Arduino, plus a Delete, space and ?

You can also use the Arduino Nano to generate video and develop a vintage Tv Typewriter.

An ideal project for this small keyboard is a Meshtastic messenger for example.