Building your own mobile robot is becoming easier and easier, thanks to excellent ready-to-use robotic platforms. A good example of such platform is the Adafruit Mini Robot Chassis kit, which comes with a nice robot chassis, two servo motors with wheels and a support-wheel. This makes it the perfect base for all your mobile robot projects.
On the other hand, you now can buy powerful & cheap microcontrollers like the ESP8266 WiFi chip, which is not only easy to use but also comes with onboard WiFi connectivity. This is just the perfect chip to control robots remotely from your computer or mobile device.
All the code is provided, clearly written and commented:
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.