Here is another robot kit for Arduino that can teach you a thing or two about STEM concepts. The KEYESTUDIO Mini Tank Robot Kit comes with IR and app control. It can follow light and avoid obstacles. It has a 8×16 LED interface. This programmable robot is ready for Arduino IDE. It works with iOS and Android devices.
You will need 2 x 18650 batteries to power this robot. This kit comes with tracks, 2 motors, an ultrasonic module, a Bluetooth module, and everything you need to get started.