Retired MSEE, after thirty something years embracing the dark side (sales and marketing) once retired I came back to my old love “Electronics and uP”. Since 5 years, or so, I’m playing with Arduino, Raspberry Pi and, occasionally, very occasionally, with STM32. It’s for fun, for learning something new (programming languages changed a lot since the time I was learning and using Fortran and Pascal) and to keep my poor brain in good shape (wife says there is no hope…)