A remote control car that you can control with your phone, here's how to do that
Chassis/steering: https://www.youtube.com/watch?v=nzkbhGDTL5w
Websocket Nodemcu connection: https://www.instructables.com/id/Esp8266Websockets-RGB-LED-controller/
DC motor control: https://www.youtube.com/watch?v=d7oFD-zQpuQ
Short demo: https://www.youtube.com/watch?v=6uOXedOu_T4
Parts: NodeMCU development board, l293d motor driver chip, dc motor, 3X 3.7v lipo battery, servo motor, breadboard, connection wires, wheels.