Easy and fun to assemble.

• "route strip" detection is performed by two infrared LED/phototransistor pairs
  • shared IR power control
  • separate sensitivity adjustment for each pair
  • blinks two red LEDs as it moves
• two DC motors with gearboxes and large wheels
  • 68 mm wheels with rubber coating
  • mounted directly to the right-angle gearbox behind the motor
  • the motor driver electronics do not support direction reversal — only on/off operation
• operates on 2x AA batteries (the battery holder is under the base plate)