Trekker Sweeping Ultrasonic Scanner Package. The servo can be programmed to scan at any angle from -90 to +90 degrees. This gives the Trekker a set of eyes. The Ultrasonic detector can detect from ~4 inches to ~10 feet.
This set of wheelchair motors makes great heavy duty robot motors. One left motor and one right motor. They are right angle gear drives have been modified to include encoders. They are 24VDC and the operating speed is 120 RPM.