Quantity   Component name
1 × Arduino Pro Micro I used a clone bought on Aliexpress
1 × MCP2515 CAN Bus Module
1 × Si6823 NPN transistor Extracted from compact fluorescent lamp's starter. Any other NPN transistor with similar parameters should be okay though.
1 × 4-way car connector For power and speed signal wires
1 × 1-way car connector For radio remote control wire
1 × Some wires
1 × LM2596 DC-DC step down power converter
2 × 4N25 optocoupler
4 × 1k resistor
1 × 10k resistor
1 × 100k resistor
1 × Pushbutton Optional, but makes Arduino resetting easier
1 × 250mA fuse
1 × 50x70mm prototyping board Actually all components barely fits into it, so for next time I think I would use bigger one (or design a PCB)
1 × ISO 10487 C1 socket