Simple Pedals for PC software (PTT for HAMradio, SDR console, FlexRadio)

I use the SDRconsole software for my QO-100 station and SmartSDR for my Flex radio. Both have in common that they run on a PC. I like such programs because they work with a mouse. With one exception: I want a PTT, preferably a foot switch, to keep my hands free.
I had to search and experiment till I found out how it works. I want to save you this time and share my learnings. No worries: It will be a short video.

Links:
Footswitch: https://s.click.aliexpress.com/e/_DCf...
USB-to-Serial adapter: https://s.click.aliexpress.com/e/_DEB...
USB-DB9 connector (not tested): https://s.click.aliexpress.com/e/_Ddu...
DB9 connector: https://s.click.aliexpress.com/e/_DCd...
Shielded cable: https://s.click.aliexpress.com/e/_DDO...

Realterm: https://sourceforge.net/projects/real...
STL Files: https://bit.ly/40Dc0LE
Article for SDR Console: https://www.f5uii.net/en/sdr-console-...
Articla for FlexRadio: https://community.flexradio.com/discu...

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