Hy boblalux,
It would be handy for us to know what facilities and skills you have so that we can answer your request in an appropriate way:
(1) Do you understand electronics: fundamental circuit theory. Know about fundamental components: resistors, capacitors, inductors, transistors, integrated circuits
NOT MUCH
(2) Do you have the fundamental electronics tools: soldering iron, miniature pliers and wire cutters.
YES
(3) Do you have the fundamental test equipment: digital multimeter, power supply
YES
(4) Do you have fundamental construction skills: soldering, sawing, filing
YES
(5) Are you able to configure and do elementary programing of an Arduino microcontroller?
NO
Apologies for asking all these questions in such a direct and clinical way. Although it sounds like an inquisition, it is only intended to be constructive and give you the best answer.
spec