Quantity   Component name
1 × Old mobile phone (sim card not neccesary)
1 × Arduino nano
1 × OTG wire to connect Arduino and phone
1 × H-bridge L298
4 × dc motor with wheel (cheap model)
1 × PLA to print the pieces
1 × electrical box (15x11x9cm more or less)
1 × Nuts & Bolts, wiring to connect all the items
3 × 18650 Li-Ion batteries