Yes, the servos do move but only momentarily. Previously they would continue moving until the viewer moved a distance away, then stopped. Everything seems to be happening just one time rather than continuously while the sensor value was within range. The motor runs without stopping, regardless of sensor readings. I was working on the stepper drivers when these other calamities occurred. I'd like to resolve them before connecting the steppers. Why do you believe the serial monitor displays only a few values, then stop?