Dash Button with Arduino Pro Mini

Here is another dash button for my FHEM SmartHome system. After building [this](https://www.thingiverse.com/thing:3678995) Dash Butten I wanted to build a new one with less power consumption, but as simple.
I've been following the [AskSinPP](https://asksinpp.de/) project for a long time, which does a great job in homematic compliant self-build equipment. The basis is usually an ATMega328 microcontroller which is available for less than 2 € at Ali.
Add to that a CC1101 868 MHz radio module and