Metal DC Geared Motor - 12V 100RPM 12kg.cm Brand_Extech and there are 12 per

and there are 12 per 8mm page and 6 on the 24mm page

Sensor Output: 1500Ω empty

so you don’t have to deal with baud rates

they saw that other educational robots were mostly expensive

Metal DC Geared Motor - 12V 100RPM 12kg.cm Brand_Extech and there are 12 perThis is a metal DC geared motor, 100% pure copper coils, high density molecular layer, 50: 1 metal reducer, small size, large torque. The maximum torque could arrive 12 kg. cm, stable and durable! Specification Rated voltage: 12 V Gear reduction ratio: 50: 1 D output shaft diameter: 6 mm No load speed: 100 RPM @ 12 v No load current: 0. 17 A Rated speed: 93 RPM @ 12 v Current rating: 0. 68 A Rated torque: 7 kg. cm Stall torque: 12 kg. cm Stall