Why am I doing this?

So God Created man in his own image,
    In the image of God he created him;
    male and female he created them. (Gen 1:27)
If God made us in the image of himself and he is the creator, then we are creators as part of that image.
Any creative act is a reflection of God.
I enjoy teaching, making, and figuring things out.  I have a couple of nephews that have showed interest in electronics and they and their family are makers.
There are many new tools and ways to get prototypes made that weren’t available just a few years ago.  For personal projects these can be very affordable.