Build a Robot Car with Speed Sensors using Arduino Interrupts
Amazon.com: Robot Kit 4WD Robot Car Smart Chassis Kit with 4 TT Motor for UNO R3/Mega 2560/Raspberry Pi/Jetson Nano, Smart Robot Car Chassis DIY Learning Kit : Toys & Games
Robotic Chassis Kit 2 Wheeler - Robotech Shop
Amazon.com: The perseids DIY Robot Smart Car Chassis Kit with Speed Encoder, 2 Wheels and Battery Box (2 Wheels) : Toys & Games
Amazon.com: LewanSoul Mecanum Chassis Car Kit with Aluminum Alloy Frame, TT Motor and 60mm Mecanum Wheels, Smart Robot Car,DIY Kit (Unassembled) : Toys & Games