Easy and fun to assemble.

• "route strip" detection is done with two infrared LED/phototransistor pairs
  • shared IR power adjustment
  • separate sensitivity adjustment for each pair
  • flashes two red LEDs while moving
• two DC motors with gearbox and large wheels
  • 68 mm wheels with rubber coating
  • mounted directly to the right-angle gearbox behind the motor
  • the motor control electronics do not support direction reversal — only on/off functions
• operates on 2x AA batteries (battery holder under the baseplate)