I design microprocessor based sensor and control systems. These include high precision sensors for a medical equipment manufacturer and precision calibration equipment for another. These sensors measure linear distance, angles, and pressure. I provide another client with landfill pump controller systems which radio collected data to a processing center. For another I have made a controller that keeps chemicals balanced in the cooling towers of large air cooling systems.
I'm retired; however, these clients keep coming back to me because I deliver reliable working systems in a much shorter time than young people. Young ones talk, text, and cruise the net too much. They do this at a high salary.