DasDouble
100 kW
I have got a really kind answer from Oleg, Adaptto Team. He has send me this picture also which describes where to install the switch. I hope its no problem for Oleg to posting this pic here so others can see it too if they want to...

DasDouble said:Hi there, following problem:
I want to be able to turn off the modi switch by a fingerprint-scanner via Arduino-Controller.
To do this I need to know a cut surface or an interface where I can place a switch between to be able to "cut the connection" if I need to.
In the end it will be like this:
-Driver puts his middle finger on finger-scan.
->Switch cuts connection of arrow key.
->Speed-Mode can´t be changed anymore.
(->Cop/policemen can´t change speed mode without the finger of driver.)
Thanks for your help.
~Elias