I mix electronics, software, embedded and connected systems design. Apps? Test & measurement systems (esp. avionics and environmental), networked energy management and weather stations, user interfaces, graphics & photography, system libs / device drivers, model trains controls. Involved in maker community. Hardware? Tiny micros to high-end PCs. Analog, digital, RF, Arduino, Raspberry Pi. Multiple computer languages. Tech writing and tech reviewer for books. PCB design, 3D printing. And more.