Controlling electronics with the Commodore 64 user port - Part 3 with Arduino

The third part of a series where I explore the possibility to use the user port on an old Commodore 64 8-bit computer from the 80-s, to communicate with other electronic devices, self made or for example an Arduino device.

In this part I program the C64 using basic to show the temperature value from a temperature sensor via an Arduino. I show how to connect everything, and how to program it in both the Arduino and the Commodore.

Electronicts kits I have purchased:

[gregryan]

I actually did this very same project through the joystick/game port using a thermistor with a couple descreet components and a basic program.
It interesting how the joystick port can be set as a input of output port, totally programmable using the 6522 VIA chip.

[congestiontv]

I like how this project brings nowadays schooling environments to communicate with the retro age. Not having the Pi1541 I could use this setup and expand the BASIC code to transmit newer programmes over to the C64 and directly writing to a floppy disk. 😶‍🌫

[d.j.peters]

The Arduino IDE used a C++ toolchain for example serial.print() the dot notation isn't C !