Quantity   Component name
2 × high torque, low speed DC motors from a printer
1 × ATMega328-p
1 × ATtiny85 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × TSOP38238 IR receiver Opto and Fiber Optic Semiconductors and ICs / Other Optoelectronic ICs
1 × IR LED
2 × 2N7002K mosfet
5 × AA batteries
1 × a few resistors and capacitors (see schematics)
1 × piece of plastic cutting board from the trash
1 × small caster
1 × assorted bits you can see in the pictures